kohler 14 20 res operation

Residential/Commercial Generator Sets

Models:

14/20RES

14/20RESL

Controller:

RDC Residential Digital ControlDC Digital Control

TP-6734 5/10

Operation

Engine exhaust from this product contains chemicals

known to the State of California to cause cancer, birth

defects, or other reproductive harm.

WARNING

California Proposition 65

Product Identification Information

Product identification numbers determine service parts.

Record the product identification numbers in the spaces

below immediately after unpacking the products so that

the numbers are readily available for future reference.

Record field-installed kit numbers after installing the

kits.

Generator Set Identification Numbers

Record the product identification numbers from the

generator set nameplate(s).

Model Designation

Specification Number

Serial Number

Accessory Number Accessory Description

Controller Identification

Record the controller description from the generator set

operation manual, spec sheet, or sales invoice.

Controller Description

Engine Identification

Record the product identification information from the

engine nameplate.

Manufacturer

Model Designation

Serial Number

Table of Contents

TP-6734 5/10 Table of Contents

Product Identification Information 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety Precautions and Instructions 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Assistance 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 1 Descriptions and Service Views 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Introduction 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Engine 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Alternator 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Transfer Switch 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Controllers 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Accessories 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6.1 Carburetor heater 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6.2 OnCuet Home Generator Management System 15. . . . . . . . . . . . . . . . . . . .

1.7 Service Views for Maintenance 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 2 Operation 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Prestart Checklist 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Exercising the Generator Set 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 RDC and DC Generator Set/ Transfer Switch Controllers 17. . . . . . . . . . . . . . . . . . .

2.4 Controller Power 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 Controls and Indicators 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5.1 LED Display 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5.2 Controller Keypad 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5.3 LED Indicators 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6 Generator Set Operation 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6.1 Engine Start Crank Cycle 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6.2 Local Starting and Stopping 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6.3 Automatic Operation with Model RRT Transfer Switch 21. . . . . . . . . . . . . .

2.6.4 Automatic Operation with Model RDT or RSB Transfer Switches 21. . . . .

2.7 Exercise 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.7.1 Unloaded Exercise with Diagnostic Test 22. . . . . . . . . . . . . . . . . . . . . . . . . .

2.7.2 Low-Speed Diagnostics 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.7.3 Loaded Exercise 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.7.4 Exerciser Reset and Disable 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.7.5 Power Failure During Exercise Cycle 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.8 Test 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.8.1 Unloaded Test 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.8.2 Loaded Test 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.8.3 Power Failure During Test Cycle 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.9 Faults 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.9.1 Warnings 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.9.2 Shutdowns 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.9.3 ATS Communication Errors 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.9.4 Resetting the Controller after a Fault Shutdown 24. . . . . . . . . . . . . . . . . . . .

2.10 Model RRT Transfer Switch Operation 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.10.1 Source Availability 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.10.2 ATS Control Sequence of Operation 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.10.3 Time Delays 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.10.4 Engine and Transfer Time Delays 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.10.5 Load Control Time Delay 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.11 Event History 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents, continued

TP-6734 5/10Table of Contents

Section 3 Scheduled Maintenance 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Scheduled Maintenance 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.1 Service Schedule, 14RES/RESL Models 30. . . . . . . . . . . . . . . . . . . . . . . . .

3.1.2 Service Schedule, 20RES/RESL Models 31. . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Lubrication System 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.1 Low Oil Pressure Shutdown 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.2 Oil Check 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.3 Engine Oil Recommendation 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.4 Oil Change Procedure 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.5 Oil Cooler 20RES/RESL 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Spark Plugs 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Air Cleaner Service 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4.1 Air Cleaner, 14RES/RESL Models 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4.2 Air Cleaner, 20RES/RESL Models 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.5 Cooling System 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.6 Exhaust System 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.7 Battery 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.8 Battery Charger 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.8.1 RES Battery Charger 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.9 Circuit Protection 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.9.1 Line Circuit Breaker 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.9.2 Fuses 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.10 Storage Procedure 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.10.1 Lubricating System 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.10.2 Fuel System 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.10.3 Cylinder Lubrication 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.10.4 Exterior Preparation 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.10.5 Battery 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 4 Troubleshooting 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Introduction 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Controller Service Access 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 Generator Set Troubleshooting 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.4 Battery Charger Troubleshooting 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix A Abbreviations 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TP-6734 5/10 5Safety Precautions and Instructions

Safety Precautions and Instructions

IMPORTANT SAFETY INSTRUCTIONS.

Electromechanical equipment,including generator sets, transferswitches,switchgear, andaccessories,

can cause bodily harm and poselife-threatening danger whenimproperly installed, operated, ormaintained. To prevent accidents beaware of potential dangers and actsafely. Read and follow all safety

precautions and instructions. SAVETHESE INSTRUCTIONS.

Thismanual hasseveral typesofsafetyprecautions and instructions: Danger,Warning, Caution, and Notice.

DANGER

Danger indicates the presence of ahazard that will cause severepersonal injury,death, orsubstantialproperty damage.

WARNING

Warning indicates the presence of ahazard that can cause severepersonal injury,death,orsubstantialproperty damage.

CAUTION

Caution indicates the presence of ahazard that will or can cause minorpersonal injury or property damage.

NOTICE

Notice communicates installation,operation, or maintenance informationthat is safety related but not hazardrelated.

Safety decals affixed to the equipment

in prominent places alert the operatoror service technician to potentialhazards and explain how to act safely.The decals are shown throughout thispublication to improve operatorrecognition. Replace missing or

damaged decals.

Accidental Starting

Accidental starting.Can cause severe injury or death.

Disconnect the battery cables beforeworking on the generator set.

Remove the negative (--) lead firstwhen disconnecting the battery.Reconnect the negative (--) lead lastwhen reconnecting the battery.

WARNING

Disabling the generator set.Accidental starting can causesevere injury or death. Beforeworking on the generator set orconnected equipment, disable the

generator set as follows: (1) Move thegenerator set master switch to theOFFposition. (2) Disconnect the power tothe battery charger. (3) Remove thebattery cables, negative (--) lead first.Reconnect the negative (--) lead last

when reconnecting the battery. Followthese precautions to prevent starting ofthe generator set by an automatictransfer switch, remote start/stopswitch, or engine start command fromaremote computer.

Battery

Sulfuric acid in batteries.Can cause severe injury or death.

Wear protective goggles andclothing. Battery acid may cause

blindness and burn skin.

WARNING

Explosion.Can cause severe injury or death.Relays in the battery chargercause arcs or sparks.

Locate the battery in awell-ventilatedarea. Isolate thebattery charger fromexplosive fumes.

WARNING

Battery electrolyte is a dilutedsulfuric acid. Batteryacidcancausesevere injury or death. Battery acid

can cause blindness and burn skin.Always wear splashproof safetygoggles, rubber gloves, and bootswhen servicing the battery. Do notopen a sealed battery or mutilate thebattery case. If battery acid splashes in

the eyes or on the skin, immediatelyflush the affected area for 15 minuteswith large quantities of clean water.Seek immediatemedical aid in thecaseof eye contact. Never add acid to a

battery after placing the battery inservice, as thismay result inhazardousspattering of battery acid.

Battery acid cleanup. Battery acidcan cause severe injury or death.Battery acid is electrically conductive

and corrosive. Add 500 g (1 lb.) ofbicarbonate of soda (baking soda) to acontainer with 4 L (1 gal.) of water andmix the neutralizing solution. Pour theneutralizing solution on the spilledbattery acid and continue to add the

neutralizing solution to the spilledbattery acid until all evidence of achemical reaction (foaming) hasceased. Flush the resulting liquid withwater and dry the area.

TP-6734 5/106 Safety Precautions and Instructions

Battery gases. Explosion can causesevere injury or death. Battery gasescan cause an explosion. Do not smokeorpermit flamesor sparks to occurnear

a battery at any time, particularly whenit is charging. Do not dispose of abattery in a fire. To prevent burns andsparks that could cause an explosion,avoid touching the battery terminalswith tools or other metal objects.

Removeall jewelrybefore servicing theequipment. Discharge static electricityfrom your body before touchingbatteries by first touching a groundedmetal surfaceaway from thebattery. Toavoid sparks, do not disturb the battery

charger connections while the batteryis charging. Always turn the batterycharger off before disconnecting thebattery connections. Ventilate thecompartments containing batteries toprevent accumulation of explosive

gases.

Battery short circuits. Explosioncan cause severe injury or death.Short circuits can cause bodily injuryand/or equipment damage.Disconnect the battery before

generator set installation ormaintenance. Remove all jewelrybefore servicing the equipment. Usetools with insulated handles. Removethe negative (--) lead first when

disconnecting the battery. Reconnectthe negative (--) lead last whenreconnecting the battery. Neverconnect the negative (--) battery cableto the positive (+) connection terminalof the starter solenoid. Do not test the

battery condition by shorting theterminals together.

Engine Backfire/FlashFire

Fire.Can cause severe injury or death.

Do not smoke or permit flames orsparks near fuels or the fuel system.

WARNING

Servicing the air cleaner. A suddenbackfire can cause severe injury ordeath. Do not operate the generatorset with the air cleaner removed.

Servicing the fuel system. A flashfirecancausesevere injuryordeath.Do not smoke or permit flames orsparks near the carburetor, fuel line,fuel filter, fuel pump, or other potentialsources of spilled fuels or fuel vapors.

Catch fuels in an approved containerwhen removing the fuel line orcarburetor.

Combustible materials. A fire cancause severe injury or death.

Generator set engine fuels and fuelvapors are flammable and explosive.Handle these materials carefully tominimize the risk of fire or explosion.Equip the compartment or nearby areawith a fully charged fire extinguisher.

Select a fire extinguisher rated ABC orBC for electrical fires or asrecommended by the local fire code oran authorized agency. Train allpersonnel on fire extinguisheroperation and fire prevention

procedures.

Exhaust System

Carbon monoxide.Can cause severe nausea,fainting, or death.

The exhaust system must be

leakproof and routinely inspected.

WARNING

Generator set operation. Carbon

monoxidecancauseseverenausea,

fainting, or death. Carbon monoxide

is an odorless, colorless, tasteless,

nonirritating gas that can cause death if

inhaled for even a short time. Avoid

breathingexhaust fumeswhenworking

on or near the generator set. Never

operate the generator set inside a

building. Never operate the generator

set where exhaust gas could seep

inside or be drawn into a potentially

occupied building throughwindows, air

intake vents, or other openings.

Carbon monoxide detectors.Carbonmonoxide can cause severenausea, fainting, or death. Installcarbon monoxide detectors on eachlevel of any building adjacent to thegenerator set. Locate the detectors to

adequately warn the buildingsoccupants of the presence of carbonmonoxide. Keep the detectorsoperational at all times. Periodicallytest and replace the carbon monoxidedetectors according to the

manufacturers instructions.

Carbon monoxide symptoms.Carbonmonoxide can cause severenausea, fainting, or death. Carbonmonoxide isapoisonousgaspresent inexhaust gases. Carbonmonoxide isan

odorless, colorless, tasteless,nonirritating gas that can cause death ifinhaled for even a short time. Carbonmonoxidepoisoningsymptoms includebut are not limited to the following: Light-headedness, dizziness

Physical fatigue, weakness injoints and muscles

Sleepiness, mental fatigue,inability to concentrateor speak clearly, blurred vision

Stomachache, vomiting, nauseaIf experiencing any of these symptomsand carbon monoxide poisoning ispossible, seek fresh air immediatelyand remain active. Do not sit, lie down,or fall asleep. Alert others to the

possibility of carbon monoxidepoisoning. Seek medical attention ifthe condition of affected persons doesnot improvewithinminutes of breathingfresh air.

TP-6734 5/10 7Safety Precautions and Instructions

Fuel System

Explosive fuel vapors.Can cause severe injury or death.

Use extreme care when handling,storing, and using fuels.

WARNING

The fuel system. Explosive fuelvapors can cause severe injury ordeath. Vaporized fuels are highlyexplosive. Use extreme care whenhandling and storing fuels. Store fuels

in a well-ventilated area away fromspark-producing equipment and out ofthe reach of children. Never add fuel tothe tank while the engine is runningbecause spilled fuel may ignite oncontact with hot parts or from sparks.

Do not smoke or permit flames orsparks to occur near sources of spilledfuel or fuel vapors. Keep the fuel linesand connections tight and in goodcondition. Do not replace flexible fuellines with rigid lines. Use flexible

sections to avoid fuel line breakagecausedbyvibration. Donotoperate thegenerator set in the presence of fuelleaks, fuel accumulation, or sparks.Repair fuel systems before resuming

generator set operation.

Gas fuel leaks. Explosive fuelvapors can cause severe injury ordeath. Fuel leakage can cause anexplosion. Check the LP vapor gas ornatural gas fuel system for leakage by

using a soap and water solution withthe fuel system test pressurized to6--8 ounces per square inch(10--14 inches water column). Do notuse a soap solution containing eitherammonia or chlorine because both

preventbubble formation. Asuccessfultest depends on the ability of thesolution to bubble.

Hazardous Noise

Hazardous noise.

Can cause hearing loss.

Never operate the generator set

without a muffler or with a faulty

exhaust system.

CAUTION

Engine noise. Hazardous noise cancause hearing loss. Generator setsnot equipped with sound enclosurescan produce noise levels greater than105 dBA. Prolongedexposure tonoise

levels greater than 85 dBA can causepermanent hearing loss. Wear hearingprotection when near an operatinggenerator set.

Hazardous Voltage/Moving Parts

Hazardous voltage.Can cause severe injury or death.

Operate the generator set only whenall guards and electrical enclosures

are in place.

Moving parts.

WARNING

Hazardous voltage.

Backfeed to the utility system can

cause property damage, severe

injury, or death.

If the generator set is used for

standby power, install an automatic

transfer switch to prevent inadvertent

interconnection of standby and

normal sources of supply.

WARNING

Welding the generator set.Can cause severe electricalequipment damage.

Never weld components of the

generator set without firstdisconnecting the battery, controllerwiringharness, andengineelectroniccontrol module (ECM).

CAUTION

Grounding electrical equipment.Hazardous voltage can causesevere injury or death. Electrocutionis possible whenever electricity ispresent. Ensure you comply with all

applicable codes and standards.Electrically ground the generator set,transfer switch, and related equipmentandelectrical circuits. Turnoff themaincircuit breakers of all power sources

before servicing the equipment. Nevercontact electrical leads or applianceswhen standing in water or on wetground because these conditionsincrease the risk of electrocution.

Welding on the generator set. Can

cause severe electrical equipmentdamage. Before welding on thegenerator set perform the followingsteps: (1) Remove the battery cables,negative (--) lead first. (2) Disconnectall engine electronic control module

(ECM) connectors. (3) Disconnect allgenerator set controller and voltageregulator circuit board connectors.(4) Disconnect the engine battery-charging alternator connections.(5) Attach the weld ground connection

close to the weld location.

Connecting the battery and thebattery charger. Hazardous voltagecan cause severe injury or death.Reconnect the battery correctly,positive to positive and negative to

negative, to avoid electrical shock anddamage to the battery charger andbattery(ies). Have a qualifiedelectrician install the battery(ies).

TP-6734 5/108 Safety Precautions and Instructions

Short circuits. Hazardousvoltage/current can cause severeinjury or death. Short circuits cancause bodily injury and/or equipment

damage. Do not contact electricalconnections with tools or jewelry whilemaking adjustments or repairs.Removeall jewelrybefore servicing theequipment.

Electrical backfeed to the utility.

Hazardous backfeed voltage cancause severe injury or death. Installa transfer switch in standby powerinstallations to prevent the connectionof standby and other sources of power.

Electrical backfeed into a utilityelectrical system can cause severeinjury or death to utility personnelworking on power lines.

Heavy Equipment

Unbalanced weight.

Improper lifting can cause severe

injury or death and equipment

damage.

Do not use lifting eyes.

Lift the generator set using lifting bars

inserted through the lifting holes on

the skid.

WARNING

Hot Parts

Hot engine and exhaust system.Can cause severe injury or death.

Do not work on the generator set untilit cools.

WARNING

Servicing the exhaust system. Hotparts can cause severe injury ordeath. Do not touch hot engine parts.The engine and exhaust systemcomponents become extremely hot

during operation.

Servicing the engine heater. Hotparts can cause minor personalinjuryorpropertydamage. Install theheater before connecting it to power.

Operating theheater before installationcan cause burns and componentdamage. Disconnect power to theheater and allow it to cool beforeservicing the heater or nearby parts.

Notice

NOTICE

Canadian installations only. Forstandby service connect the output ofthe generator set to a suitably ratedtransfer switch in accordance withCanadian Electrical Code, Part 1.

TP-6734 5/10 9Introduction

Introduction

This manual provides operation and maintenance

instructions for residential/commercial model

14/20RES and RESL generator sets equipped with

Residential Digital Control (RDC) or Digital Control (DC)

generator set/transfer switch controllers. The RDC and

DC controllers control the generator set and the optional

Model RRT transfer switch. See Figure 1.

This generator set is approved for use in stationary

applications in locations served by a reliable utility

power source. Have the generator set installed by an

authorized distributor/dealer or service technician.

Refer to TP-6733, Installation Manual, for installation

instructions.

Information in this publication represents data available

at the time of print. Kohler Co. reserves the right to

change this publication and the products represented

without notice and without any obligation or liability

whatsoever.

Read this manual and carefully follow all procedures

and safety precautions to ensure proper equipment

operation and to avoid bodily injury. Read and follow the

Safety Precautions and Instructions section at the

beginning of this manual. Keep this manual with the

equipment for future reference.

The equipment service requirements are very important

to safe and efficient operation. Inspect the parts often

and perform required service at the prescribed intervals.

Obtain service from an authorized service distributor/

dealer to keep equipment in top condition.

TP-6734

Figure 1 RES/RESL Generator Set and Optional

Model RRT Transfer Switch

List of Related Literature

Figure 2 identifies related literature available for the

generator sets covered in this manual. Only trained and

qualified personnel should install or service the

generator set.

Literature Type Part Number

14/20RES/RESL Generator Set

Installation Manual TP-6733

ModelRRTTransferSwitchOperation/

Installation Manual TP-6751

Figure 2 Generator Set Literature

Nameplate

The following illustration shows a typical generator set

nameplate. Copy the model, serial, and specification

numbers from the nameplate into the spaces provided in

the product information section on the inside front cover

of this manual. See Section 1.7 for the nameplate

location.

GM12070

TP-6734 5/1010 Introduction

Emission Compliance, 14RES/RESL

All model 14RES/RESL generator sets with multi-fuel

systems are emission-certified.

An engine or generator set with the following

identification label is certified to meet Small Off-Road

Engine emission standards for EPA/CARB.

IMPORTANT ENGINE INFORMATION

THIS ENGINE MEETS U.S. EPA PH2 ANDCA 2008 AND LATER EXH EMISSIONREGS FOR SI SORE

FAMILYDISPL (CC)MODEL NO.SPEC NO.SERIAL NO.BUILD DATE

EMISSION COMPLIANCE PERIOD:EPA: CATEGORY A CARB: EXTENDEDCERTIFIED ON: LPG/NATURAL GASREFER TO OWNERS MANUAL FOR HP RATING,SAFETY, MAINTENANCE, AND ADJUSTMENTS

1-800-544-2444 KohlerEngines.com

KOHLER CO. KOHLER WISCONSIN USAtp6515

N11236

Figure 3 Engine Identification Label, 14RES/RESL

Generator Set

This engine/generator is certified to operate using

natural gas or propane fuel.

The Emission Compliance Period referred to on the

EmissionControl or Air Index label indicates the number

of operating hours for which the engine has been shown

to meet CARB or EPA emission requirements. The

following table provides the engine compliance period

(in hours) associated with the category descriptor found

on the certification label.

Emission Compliance Period (hours)

EPAC250

B500

A1000

CARBModerate,

125Intermediate,

250Extended,

500

Figure 4 14RES/RESL

Refer to the certification label for engine displacement.

The exhaust emission control system for the CH740

engines (14RES/RESL) is EM.

Emission Compliance, 20RES/RESL

The model 20RES/RESL generator set engine is

certified to meet emission regulations for U.S. EPA

phase 2 small off-road engines and CA 2006 and later

LSI engines (large spark-ignited engines at or below 1

liter).

Figure 5 Engine Identification Label, 20RES/RESL

Generator Set

The Emission Compliance Period referred to on the

Engine Identification label indicates the number of

operating hours for which the engine has been shown to

meet EPA emission requirements. The engine

compliance period (in hours), associated with the

Category A descriptor found on the certification label, is

1000 hours.

Emission Compliance Period (hours)

EPA Category A, 1000 hours

Figure 6 20RES/RESL

Refer to the certification label for engine displacement.

The exhaust emission control system for the CH1000

engine (20RES/RESL) is EM.

TP-6734 5/10 11Service Assistance

Service Assistance

For professional advice on generator set power

requirements and conscientious service, please contact

your nearest Kohler distributor or dealer.

Consult the Yellow Pages under the heading

GeneratorsElectric.

Visit the Kohler Power Systems website at

KohlerPower.com.

Look at the labels and stickers on your Kohler product

or review the appropriate literature or documents

included with the product.

Call toll free in the US and Canada 1-800-544-2444.

Outside the US andCanada, call the nearest regional

office.

Headquarters Europe, Middle East, Africa

(EMEA)

Kohler Power Systems

3 rue de Brennus

93200 Saint Denis

France

Phone: (33) 1 49 178300

Fax: (33) 1 49 178301

Asia Pacific

Power Systems Asia Pacific Regional Office

Singapore, Republic of Singapore

Phone: (65) 6264-6422

Fax: (65) 6264-6455

China

North China Regional Office, Beijing

Phone: (86) 10 6518 7950

(86) 10 6518 7951

(86) 10 6518 7952

Fax: (86) 10 6518 7955

East China Regional Office, Shanghai

Phone: (86) 21 6288 0500

Fax: (86) 21 6288 0550

India, Bangladesh, Sri Lanka

India Regional Office

Bangalore, India

Phone: (91) 80 3366208

(91) 80 3366231

Fax: (91) 80 3315972

Japan, Korea

North Asia Regional Office

Tokyo, Japan

Phone: (813) 3440-4515

Fax: (813) 3440-2727

Latin America

Latin America Regional Office

Lakeland, Florida, USA

Phone: (863) 619-7568

Fax: (863) 701-7131

TP-6734 5/1012 Service Assistance

Notes

TP-6734 5/10 13Section 1 Descriptions and Service Views

Section 1 Descriptions and Service Views

1.1 Introduction

The generator set specification sheets provide specific

generator and engine information. Refer to the spec

sheet for data not supplied in this manual. Consult the

generator set servicemanual, engine operationmanual,

and engine service manual for additional specifications.

Obtain copies of the latest spec sheets, manuals,

diagrams, and drawings from your local distributor/

dealer.

1.2 Engine

The generator set has a four-cycle, twin cylinder, air-

cooled Kohler engine. The engine operates on clean-

burning natural gas or propane (LP) vapor. Engine

features include:

Efficient overhead valve design and full pressure

lubrication for maximum power, torque, and reliability

under all operating conditions.

Dependable, maintenance-free electronic ignition.

Precision-formulated cast iron construction of parts

subjected to the most wear and tear.

Field-convertible multi-fuel systems that allow fuel

changeover from natural gas to LP vapor (and vice-

versa) while maintaining CARB emission

certification.

Digital spark advance optimizes ignition timing for the

selected fuel.

1.3 Alternator

The generator uses Kohlers unique PowerBoost

voltage regulation system, which provides instant

response to load changes.

PowerBoost ensures reliable motor starting and

consistent voltage levels. PowerBoost utilizes a

voltage excitation system that employs a winding

independent of the main output windings to provide

excitation voltage.

1.4 Transfer Switch

The RDC and DC controllers are designed to

communicate with and control the Kohler model RRT

Automatic Transfer Switch (ATS).

If the power systemuses a transfer switch other than the

Kohler model RRT ATS, the RDC controller functions

as a generator set controller only. ATS communication

and functions do not operate with any other ATS. The

low-speed exercise is not available with any other ATS.

An ATS other than the model RRT must provide engine

start contacts that connect to the remote engine start

leads on the generator set.

TP-6734 5/1014 Section 1 Descriptions and Service Views

1.5 Controllers

RDC (RES) DC (RESL)

Figure 1-1 Controllers

RES models are equipped with the Residential Digital

Control (RDC). RESL models use the Digital Control

(DC). See Figure 1-1. Controller features include:

Integrated control for the generator set and Kohler

Model RRT transfer switch

Membrane keypad for configuration and adjustment

(RDC only)

Password-protected access to system

configuration and adjustment menus

System voltage/frequency selection and engine

configuration

Voltage, gain, and engine speed adjustment

Master switch pushbuttons (Off, Auto, Run)

Off, Auto, and Run LED indicators

LED display:

Crank cycle status

Setup information (RDC only)

Software version

Faults

Event history

Scrolling system status display when generator set is

running includes:

Engine runtime hours

Battery voltage

Generator voltage

Engine temperature

Utility voltage*

Faults displayed:

ATS communication error

Auxiliary fault

High battery voltage

High engine temperature

Locked rotor

Low battery voltage

Low oil pressure

Overcrank

Overfrequency

Overspeed

Overvoltage

Underfrequency

Underspeed

Undervoltage

Selectable exercise and test modes:

Weekly unloaded quiet diagnostic test *

Weekly loaded exercise

Loaded test

Unloaded test

Smart engine cooldown senses engine temperature *

Remote two-wire start/stop capability for optional

connection of Model RDT or RSB transfer switches

Digital isochronous governor to maintain

steady-state speed at all loads

Digital voltage regulation: 1.5% RMS no-load to

full-load

Automatic start with programmed cranking cycle

Load control output allows delayed start of large

motor loads *

Field-upgradeable controller firmware (requires

KohlerSiteTech software, available only to Kohler

authorized distributors and dealers)

Front-access mini USB connector for software

upgrade

Generator output voltage and frequency sensing with

adjustable voltage pickup and dropout settings

(requires Kohler SiteTech software for

adjustment)

Engine start and transfer time delays, adjustable

using optional Kohler SiteTech software

(available only to Kohler authorized distributors and

dealers) *

Communicates utility voltage sensing data and

transfer signals with the Model RRT transfer switch *

Front access fuses and mini-breaker

* Model RRT transfer switch required

TP-6734 5/10 15Section 1 Descriptions and Service Views

1.6 Accessories

The following optional accessories are offered for the

RES and RESL generator sets.

1.6.1 Carburetor heater

An optional carburetor heater is recommended for

improved cold starting in locations where the ambient

temperature drops below 0C (32F). The carburetor

heater prevents condensation and carburetor icing. The

heater requires a continuous source of 120 VACpower.

See the generator set Installation manual for more

information.

1.6.2 OnCue Home Generator

Management System

The Kohler OnCue Home Generator Management

System allows monitoring and control of your RES or

RESL generator set from a personal computer located

in your home or at other remote locations. OnCue can

also be configured to send email or text message

notifications in the event of a generator set fault.

Note: Be sure to obtain the correct version of the

OnCue kit for the RDC/DC controller.

OnCue version 3.0 with the Ethernet option board is

required for RES/RESL generator sets equipped with

the RDC/DC controller. Earlier versions of the OnCue

kit are not compatible with the RDC/DC controller.

TP-6734 5/1016 Section 1 Descriptions and Service Views

1.7 Service Views for Maintenance

25 12REAR VIEW

23

18

19

24

17

14

AIR INTAKE SIDE --PANELREMOVED TO SHOW DETAIL

1

23

10

4

9

11

ADV-7876

8

5

13

1. Muffler (located below cover plate)

2. Oil check dipstick3. Air cleaner

4. Oil filter

5. RDC or DC controller6. Fuses

7. USB connector (for firmware updates)

8. Line circuit breaker

9. Oil fill10. Oil drain valve

11. Exhaust outlet

12. Air intake13. Lifting holes

14. Field-connection terminal block location

15. Digital spark advance ignition (DSAI) leads16. Fuel solenoid valve

17. Oil drain hose

18. Engine starting battery location (battery purchased separately)19. Battery cables

20. Battery charger location (charger not shown)

21. 120 VAC receptacles for battery charger and optional carburetor

heater (not shown)22. Nameplate location

23. Gas regulator assembly

24. Fuel block or LP orifice location (inside hose fitting)25. Fuel inlet

12

FRONT VIEW

TOP VIEW -- ROOFREMOVED TO SHOW DETAIL

6, 7

15, 16

22

20, 21

10

Figure 1-2 Generator Set Components

TP-6734 5/10 17Section 2 Operation

Section 2 Operation

2.1 Prestart Checklist

To ensure continued satisfactory operation, perform the

following checks or inspections before or at each

startup, as designated, and at the intervals specified in

the service schedule. In addition, some checks require

verification after the unit starts.

Air Cleaner. Check for a clean and installed air cleaner

element to prevent unfiltered air from entering the

engine.

Air Inlets. Check for clean and unobstructed air inlets.

Battery. Check for tight battery connections. Consult

the battery manufacturers instructions regarding

battery care and maintenance.

Exhaust System. Check for exhaust leaks and

blockages. Check the muffler condition.

Inspect the exhaust system components for cracks,

leaks, and corrosion. Check for tight exhaust system

connections.

Check for corroded or brokenmetal parts and replace

them as needed.

Check that the exhaust outlet is unobstructed.

Oil Level. Check the oil level before starting the

generator set and at the intervals given in Section 3,

Scheduled Maintenance. Maintain the oil level at or

near, not over, the full mark on the dipstick.

Operating Area. Check for obstructions that could

block the flow of cooling air. Keep the air intake area

clean. Do not leave rags, tools, or debris on or near the

generator set.

2.2 Exercising the Generator Set

Operate the generator set without load once each week

for 20 minutes. If the generator set is connected to a

Kohlermodel RRT transfer switch, a weekly ultra-quiet

diagnostic test/exercise can be set to run automatically.

See Section 2.7 for instructions to set the exerciser.

If the generator set is connected to a Kohler model

RDT or RSB transfer switch, refer to the transfer switch

instructions to set the automatic exercise function. If the

generator set is not connected to an automatic transfer

switch (ATS) with an exercise option, run the unit in the

presence of an operator.

The operator should perform all of the prestart checks

before starting the exercise procedure. Start the

generator set according to the starting procedure in the

controller section of this manual. While the generator

set is operating, listen for a smooth-running engine and

visually inspect the generator set for fluid or exhaust

leaks. Check the air inlets and outlets and remove any

items restricting the air flow.

2.3 RDC and DC Generator Set/

Transfer Switch Controllers

RES model generator sets are equipped with the

Residential Digital Control (RDC). The RDC controls

the power system generator set and model RRT

automatic transfer switch (ATS) (if equipped). The

controller receives voltage sensing data from the ATS

and operates the generator set and transfer switch to

provide standby power when utility power is lost.

If the generator set is not connected to a Kohlermodel

RRT ATS, the RDC/DC controller functions as a

generator set controller only. ATS communication and

functions do not operate with other ATS models. The

ultra-quiet diagnostic test/exercise is not available with

other ATS models.

2.4 Controller Power

The RDC and DC controllers are powered by the

generator set engine starting battery.

Note: The generator sets are equipped with factory-

installed battery chargers to prevent battery

discharge. The battery charger must be

connected to utility power.

TP-6734 5/1018 Section 2 Operation

2.5 Controls and Indicators

Figure 2-1 illustrates the RDC and DC controller user

interfaces.

1. LED display

2. Up button (RDC only)3. Select button (RDC only)

4. Down/Exercise button (RDC)

5. Exercise button (DC)

6. Service access (see Section 4.2)

7. RUN button and LED8. AUTO button and LED

9. OFF button and LED

1

9

3

2

7

8

6

4

1

9

7

8

6

5

Residential Digital Controller (RDC) Digital Controller (DC)

Figure 2-1 RDC and DC Controls and Indicators


2.5.1 LED Display

When the system is in AUTOand the generator set is not

running, the LED display shows the engine run time

hours. During cranking, the display shows the crank

cycle information.

When the generator is running, the display steps

through the status messages shown in Figure 2-2, as

applicable. The generator set must be connected to a

model RRT transfer switch for the utility voltage display.

When a fault or warning condition exists, the controller

will show the respective message. The following table

shows the various generator conditions and expected

display or messages.

Generator set is running.

Model RRT transfer switch is required for utility voltage

display.

Display steps through the parameters in sequence for

2 seconds each.

tp6734

Engine RuntimeXXX.X or XXXX hours

Utility VoltageUXXX VAC

Engine TemperaturetXXX

Battery VoltagebXX.X VDC

Generator VoltageEXXX VAC

Test or exercise mode,if applicable.

tnLd, t LD, EnLd, or E Ld

Figure 2-2 Data Displays, Generator Running

Display Description

Blank (dark) Controller is off.

u#.# Controller software version number

XXX.X Engine hours to 999.9

XXXX Engine hours, 1000 to 9999

bXX.X Battery voltage

tXX.X Engine temperature

UXXX Utility voltage

EXXX Generator voltage

tnLd Test, no load

t Ld Test, loaded

EnLd Exercise, no load

E Ld Exercise, loaded

CC1, 2, or 3 Engine crank cycle 1, 2, or 3. Flashesduring crank pause.

Fault code Warning or fault. See Figure 2-7.

Figure 2-3 RDC Controller Display

2.5.2 Controller Keypad

TheRun,Off, Auto, andDown arrowor Exercise buttons

control the generator set as described in Figure 2-4.

See Section 2.6 for operation instructions.

RDC controller only: The Select, Up, and Down

buttons on the controller keypad are used to adjust the

controller parameters. The system configuration and

performance is factory-set and should not require

changes under normal operating conditions. To prevent

inadvertent changes, a pass code is required to access

the controller parameter settings. Contact an

authorized distributor/dealer or service technician if

adjustments are required.


Button Button Function

RUN Starts the generator set. The engine starttime delay is ignored.

OFF Shuts down the generator set. Thecooldown time delay is ignored.

During the engine crank cycle, pressingOFF will stop the crank cycle.

Press and hold for 3 seconds to view eventhistory. See Section 2.11.

AUTO Places the generator set in Auto mode.See Figure 2-5.

DOWNarrow(RDC) orEXERCISE(DC)

Starts an unloaded exercise. Press duringtest or exercise to change from unloaded toloaded.

Select RDC only. Used to change parametersettings. Password-protected. Contactyour distributor/dealer if necessary.UP arrow

Figure 2-4 Pushbutton Operation

2.5.3 LED Indicators

LEDs above the RUN, OFF, and AUTO buttons indicate

the mode of operation as shown in Figure 2-5.

Mode LED Indication Description

RUN RUN LED is on The generator set was started by pressing the RUN button. Generator set isrunning. Remote start and stop commands are ignored.

OFF OFF LED lights for 2seconds, then flashesevery 2 seconds.

The OFF button was pressed. Generator set and controller are off. Remotestart/stop commands have no effect.

AUTO AUTO LED is on Automatic mode. Generator set will respond to engine start and stop commandsfrom the controller or an ATS. Time delays operate as described in Section 2.6.

Figure 2-5 Operation Modes and LED Indicators


2.6 Generator Set Operation

2.6.1 Engine Start Crank Cycle

The controller attempts to start the generator set three

times (three crank cycles, 15 seconds crank and

15 seconds off). See Figure 2-3 for display information

during the crank cycle. If the generator set does not start

in three attempts, the system shuts down on an

overcrank fault. See Section 2.9.

Pressing the OFF button during the crank cycle stops

the cranking. No other buttons are acknowledged

during the crank cycle.

2.6.2 Local Starting and Stopping

Start

Press theRUNbutton to immediately start the generator

set. The engine start time delay will be ignored.

The controller attempts to start the generator set three

times. If the generator set does not start in three

attempts, the system shuts down on an overcrank fault.

See Section 2.9.

Stop

1. Run the generator set with no load for at least

2 minutes to ensure adequate engine cooldown.

2. Press the OFF button. The engine stops.

2.6.3 Automatic Operation with Model

RRT Transfer Switch

Themodel RRT transfer switch connects to theRDC/DC

controller through the ATS interface board on the

transfer switch. Also see Section 2.10, Model RRT

Transfer Switch Operation.

The controller must be in AUTOmode. Press the AUTO

button to put the controller into automatic mode.

Automatic Start

The RDC/DC controller receives utility source voltage

sensing data from the model RRT transfer switch.

1. If the utility source voltage falls below an

acceptable level, the controller starts the engine

start time delay.

2. If the utility source is not restored before the time

delay expires, the generator set starts.

3. After the Normal-to-Emergency time delay, the

ATS is signaled to transfer the load to the

emergency source.

Automatic Stop with Engine Cooldown

1. When the utility source is restored, the

Emergency-to-Normal time delay starts.

2. When the Emergency-to-Normal time delay

expires, the load is transferred to the utility.

3. The controller runs the generator set for the

cooldown time and then stops the generator set.

2.6.4 Automatic Operation with Model

RDT or RSB Transfer Switches

If a Kohler Model RDT or RSB transfer switch is used,

the engine start contacts from the ATS must be

connected to engine start leads 3 and 4 on the generator

set.

The controller must be in AUTO mode to respond to

remote start/stop signals from an ATS or remote switch.

Press the AUTO button to put the controller into

automatic mode.

Automatic Start

The engine start contacts on the ATS close to signal the

generator set to start, and remain closed while the

generator set is running.

Automatic Stop

Open the contact across engine start leads 3 and 4 to

signal the generator set to stop.


2.7 Exercise

A power system that includes a model RES or RESL

generator set and a model RRT transfer switch can be

set to automatically run the generator set at the same

time and day each week. Exercising the generator set

weekly is required in order to keep the engine and

alternator in good operating condition.

Follow the instructions in this section to start a 20-minute

exercise run and set the exerciser to run at the same

time every 7 days.

Note: These instructions apply to systems that have a

Kohlermodel RRT transfer switch connected to

the RDC/DC controller.

If a model RDT or RSB transfer switch is used with the

generator set, refer to the instructions provided with the

transfer switch to set the exerciser.

2.7.1 Unloaded Exercise with

Diagnostic Test

An unloaded exercise runs the generator set without

signalling the transfer switch to transfer the electrical

load from the utility source to the generator set. To start

an unloaded, ultra-quiet diagnostic test, the controlmust

be in the AUTO mode with the AUTO LED ON and the

Utility power available.

1. Press the down arrow button (RDC) or exercise

button (DC) to initiate the engine start signal.

2. The generator begins its crank cycles. During the

crank cycles CCn appears on the display. No

button presses are acknowledged during the crank

cycles.

3. EnLd appears on the display once the generator is

running. The generator runs at low speed. The

AUTO LED will be illuminated. The controller

monitors the system during the unloaded exercise

as described in Section 2.7.2, Low Speed

Diagnostics.

4. The generator runs at low speed for 20minutesand

then shuts down.

Note: If the engine temperature has risen to 104C

(219F) or higher, the unit will run at full

speed for 5 minutes to allow engine

cooldown before shutting down.

The exercise time is set to the time the down arrow or

exercise button was pressed. An unloaded, ultra-quiet

diagnostic test will occur at the same time every seven

days.

2.7.2 Low-Speed Diagnostics

During the unloaded diagnostic test, the controller

monitors the following data. The controller display

indicates an unloaded exercise run (EnLd) during the

diagnostics, unless a fault is detected as described

below.

Battery voltage. If the controller detects low battery

voltage, a low battery warning is indicated and the

exercise does not start.

Generator output frequency and voltage. The

controller verifies that the voltage and frequency are

within acceptable limits for the run speed.

ATSconnection. The controller verifies that the ATS

interface board, if connected, remains connected. An

ATS Communication Lost fault will be displayed if the

connection is lost.

Oil pressure. The controller verifies the engine oil

pressure during low speed operation.

2.7.3 Loaded Exercise

A loaded test or exercise starts the generator set and

then transfers the electrical load from the utility source to

the generator set. The load is transferred back to the

utility source before the generator set shuts down.

To start a loaded full-speed exercise, the control must be

in the AUTO mode with the AUTO LED on and utility

power must be available.

1. Press the down arrow button (RDC) or the exercise

button (DC) to initiate the engine start signal.

2. The generator begins its crank cycles. During the

crank cycles CCn appears on the display. No

button presses are acknowledged during the crank

cycles.

3. EnLd appears on the display once the generator is

running. The AUTO LED will be illuminated. The

generator is running at low speed with no load.

4. Press the down arrow button (RDC) or exercise

button (DC) a second time. The generator ramps

up to normal operating speed (typically 3600 RPM)

and the ATS transfers the load.

5. E Ld appears on the display. The AUTO LED is

illuminated. The generator runs at normal

operating speed for twenty minutes with load.


6. After 20minutes, the ATS transfers the load back to

utility power. The engine runs for the cooldown

cycle and then shuts down.

The exercise time is set to the time the down arrow

button (RDC) or exercise button (DC) was initially

pressed. A loaded, full-speed exercise will occur at the

same time every seven days.

2.7.4 Exerciser Reset and Disable

To reset the exerciser to run at a different day and/or

time, or to switch between a loaded and unloaded

exercise, follow the procedures above to start an

unloaded or loaded exercise on the desired time and

day. The previous exercise setting is replaced by the

new time, day, and loaded or unloaded condition.

To disable the exerciser, press and hold the OFF and

DOWN arrow or EXERCISE buttons together for

3 seconds.

2.7.5 Power Failure During Exercise

Cycle

If the utility power is lost during an unloaded exercise,

theATS transfers to the emergency source, the exercise

is ended and the control remains in the AUTO mode.

If the utility power is lost during a loaded exercise, the

exercise is ended. The ATS remains in the emergency

position and the control goes into the AUTO mode.

WhenUtility power is restored, the ATSwill re-transfer to

the utility source through normal timing sequences.

2.8 Test

An operator can use the buttons on the RDC/DC

controller to test the generator set and transfer switch

(model RRT only) operation at any time. Unlike the

exercise function, a test does not start or stop

automatically. The operator must use the RDC/DC

controller to start and stop the test. Follow the

instructions below to run an unloaded or loaded test.

2.8.1 Unloaded Test

An unloaded test runs the generator set without

signalling the transfer switch to transfer the electrical

load from the utility source to the generator set.

Press the RUN button to start an unloaded test. The

engine cranks and starts. tnLd appears on the display

once the generator is running. The RUN LED is

illuminated. The engine runs at normal operating speed

(3600 RPM) during the test sequence.

Pressing the OFF button during the crank cycle stops

the cranking. No other buttons are acknowledged

during the crank cycle.

There are two ways to end an unloaded test:

Press the AUTO button to shut down the generator

set and enter AUTO mode.

Press the OFF button to shut down the generator set.

The cooldown time delay is ignored.

Figure 2-6 describes the effect of pressing the buttons

during a test, with the engine running and no active

faults.

Button

Press Response

AUTO Shuts down the engine, through normaltiming sequences, and goes to the AUTOmode. AUTO LED turns ON. RUN LEDturns OFF.

OFF Ends the test and shuts down thegenerator. The cooldown time delay isignored when a test is ended. The RUNLED turns OFF. The OFF LED turns ONand then flashes every 2 seconds.

RUN No effect.

DOWNarrow/EXERCISE

Causes the ATS to transfer to theemergency source. The display indicates aLoaded Test, t Ld.

Figure 2-6 Button Function During Test

2.8.2 Loaded Test

A loaded test starts the generator set and then signals

the model RRT transfer switch to transfer the electrical

load from the utility source to the generator set. The load

is transferred back to the utility source before the

generator set shuts down.

To run a loaded test:

1. Press the RUN button to start an unloaded test as

described in Section 2.8.1. tnLd appears on the

display once the generator is running.

2. Press the down arrow button (RDC) or the exercise

button (DC) to signal the ATS to transfer the load.

The display indicates a loaded test, t Ld.

3. To end the test, press the AUTO button to shut

down the generator set through normal timing

sequences. The engine cooldown cycle runs


before the generator set engine stops. The

generator set goes into Auto mode.

Immediate Shutdown During a Loaded Test

Press the OFF button to shut the generator set down

immediately, if necessary. The cooldown time delay is

ignored, and the controller goes to OFF mode. The

controller signals the RRT transfer switch to transfer the

load back to utility power.

Note: Running the generator set with no load for at least

2 minutes is recommended to ensure adequate

engine cooldown. Use the OFF button to stop a

loaded test only if necessary.

2.8.3 Power Failure During Test Cycle

If the utility power is lost during an unloaded test, the

ATS transfers to the emergency source and the test is

ended. The control goes into the AUTO mode.

If the utility power is lost during a loaded test, the test is

ended and the ATS remains in the emergency position.

The control goes into the AUTO mode.

When Utility power is restored, the ATS re-transfers to

the utility source through normal timing sequences.

2.9 Faults

Fault conditions are shown in Figure 2-7. Fault

conditions are classified as warnings or shutdowns.

2.9.1 Warnings

The controller displays a fault code but the generator set

does not shut down on a warning. The controller resets

automatically after a warning condition is corrected.

2.9.2 Shutdowns

Under a fault shutdown condition, the generator set

shuts down automatically and the controller displays a

fault code. In some cases, the engine cooldown cycle

runs before the engine shuts down. See Figure 2-7.

Shutdown switches (such as the low oil pressure switch

or high engine temperature switch) on the generator set

will automatically reset when the problem is corrected.

However, the fault condition at the controller does not

clear until the controller is reset.

The generator set cannot be restarted until the fault

condition is corrected and the controller is reset. See

Section 2.9.4 to reset the controller after a fault

shutdown.

2.9.3 ATS Communication Errors

An ATS fault can be caused by two conditions.

When a model RRT transfer switch is used, an ATS

fault indicates that communication with the interface

board on the transfer switch has been lost. The

generator set shuts down. Check the connection to

the ATS interface board.

When a model RDT or RSB transfer switch is used,

an ATS fault indicates that connection to the ATS

interface board is detected when it is not expected. A

warning is displayed but the generator set does not

shut down.

2.9.4 Resetting the Controller after a

Fault Shutdown

Always identify and correct the cause of a fault

shutdown before resetting the controller. Check the

fault code displayed on the controller and refer to

Figure 2-7 to identify and correct the fault condition

before proceeding. Contact an authorized

distributor/dealer for service, if necessary.

Procedure to Reset the Controller after a Fault

Shutdown

1. Press OFF to turn off the generator set.

2. Disconnect the generator set from the load using

the line circuit breaker or ATS. See the safety

precautions at the beginning of this manual before

proceeding.

3. Identify and correct the cause of the fault

shutdown. See the safety precautions at the

beginning of this manual before proceeding. Refer

to Section 4, Troubleshooting.

4. Start the generator set by pressing RUN. Check

the generator set operation to verify that the cause

of the shutdown has been corrected.

5. Press the OFF button to stop the generator set.

6. Reconnect the generator set to the load using the

line circuit breaker or ATS.

7. Press AUTO to put the generator set into automatic

mode.


Code Fault

Warning (W) or

Shutdown (SD) Condition Check

AF Auxiliary faultinput

SD * An optional customer-connected input isclosed.

Check customer-supplied equipment.

HE High enginetemperature

SD * Engine coolant temperature exceeds themaximum temperature for more than5 seconds. Function becomes activeafter crank disconnect.

Check for blocked air inlets andexhaust outlets.

LOP Low oilpressure

SD * The LOP switch indicates low oilpressure for more than 5 seconds.Function becomes active 30 secondsafter crank disconnect (30 secondinhibit).

Note: The low oil pressure shutdowndoes not protect against low oil level.Check the engine oil level regularly asrecommended in Section 3.

Check for leaks in the lubricationsystem.

Check the oil level and add oil if thelevel is low.

OC Overcrank SD Three unsuccessful starting attempts. Check the fuel supply, spark plug,and battery.

Check for loose connections.

Contact an authorizeddistributor/dealer for service.

Lr Locked rotor SD No engine rotation is sensed duringcranking. Shuts down 3 seconds afterthe fault is detected.

OF Overfrequency SD * Governed frequency exceeds 110% ofthe systems frequency setpoint for morethan 5 seconds. Function becomesactive 10 seconds after engine start(10 second inhibit).


OS Overspeed SD * Engine speed exceeds 115% of thenormal running speed for more than0.3 seconds.


US Underspeed SD * Engine speed drops below 85% of thenormal running speed for more than0.3 seconds.

Reduce the load.


OU Overvoltage SD * Output voltage exceeds 120% of thesystem nominal voltage for more than2 seconds.


UF Underfrequency SD * Governed frequency falls below 90% ofthe system frequency setting for morethan 5 seconds, or 1 Hz below thesystem frequency setting for more than60 seconds.

Function becomes active 10 secondsafter engine start. (10 second inhibit).

Reduce the load and restart thegenerator set.


UU Undervoltage SD * Output voltage falls below 80% of thenominal system voltage for more than10 seconds.

Reduce the load and restart thegenerator set.


HB High batteryvoltage

W Engine starting battery voltage risesabove 125% of the battery voltage settingfor more than 10 seconds when theengine is running. Not operative duringthe engine crank cycle.

Clears when the battery voltage returnsto an acceptable level.

Check the battery rating andcondition.

Check the battery charger operation.

* Engine cooldown runs before shutting down.

(continued on next page)


Code Fault

Warning (W) or

Shutdown (SD) Condition Check

LB Low batteryvoltage

W Engine starting battery voltage falls belowthe battery voltage setting (typically12 volts) for more than 90 seconds whenthe engine is not running. Not operativeduring the engine crank cycle.

Clears when the battery voltage returnsto an acceptable level.

Check the battery rating andcondition.

Check the battery charger operation.

Charge or replace the battery.

SS Speed sensorfailure

SD Engine speed sensor has failed. Contact an authorizeddistributor/dealer for service.

AC Loss of ACsensing

W (1 sec.)

SD (3 sec.) *

Generator output AC sensing is lost.Starts 10 seconds after crank disconnect.

Warning: after 1 second if no outputdetected after crank disconnect.

Fault: after 3 seconds if voltage waspresent and then lost.


LCB Low crankingvoltage

W Battery voltage falls below 60% ofsystem battery voltage for more than 6seconds while the starter is engaged.

Charge or replace the battery.

ATS ATScommunicationerror

SD (RRT) *

W (other ATS)

RRT: Shutdown if ATS interfaceconnection is lost.

Other ATS: Warning is displayed if ATSinterface board is connected when it isnot expected.

See Section 2.9.3.

Check connection to model RRTtransfer switch interface board.

LrC Loss of voltageregulatorcommunication

SD * No communication between controllerand voltage regulator.


* Engine cooldown runs before shutting down.

Figure 2-7 Controller Fault Codes


2.10 Model RRT Transfer Switch

Operation

The RDC/DC generator set/transfer switch controller

manages automatic transfer switch (ATS) functions

when connected to aKohlermodelRRT transfer switch

through the ATS interface board.

2.10.1 Source Availability

The Model RRT transfer switch supplies voltage

sensing data to the RDC/DC controller through the ATS

interface board. If the source voltage falls below the

undervoltage dropout setting, the source is considered

to have failed. See Figure 2-8.

Item Setting

Accuracy 5%

Undervoltage Dropout 90% of Pickup

Undervoltage Pickup 90% of Nominal

Figure 2-8 Voltage Sensing Parameters

2.10.2 ATS Control Sequence of

Operation

See Figure 2-9 for time delay settings.

Preferred Source Fails:

1. The load control contact opens.

2. The engine start time delay times out.

3. The generator set is signaled to start.

4. The generator starts and the emergency source

becomes available.

5. The normal-to-emergency time delay times out.

6. The transfer switch transfers to the emergency

source.

7. The load control contact time delay times out.

8. The load control contact closes.

Normal Source Returns:

1. The emergency-to-normal time delay times out.

2. The contactor transfers to the normal source.

3. The engine cooldown time delay times out.

4. The generator is signaled to stop.

2.10.3 Time Delays

Time delays are factory-set to the values shown in

Figure 2-9. An authorized distributor/dealer can adjust

time delays using a personal computer and Kohler

SiteTech software.

Time delays described in this section operate only when

the controller is connected to a Kohler model RRT

transfer switch.

Time Delay Setting Description

Engine Start 3 seconds Time delay after utility source is lost until the engine start cycle begins.Guards against starting the generator set because of a brief change inthe utility source.

Transfer, Normal to Emergency 3 seconds Time delay after emergency source becomes available until transfer toemergency source.

Transfer, Emergency to Normal 2 minutes Time delay after the utility source returns until transfer back to normal.Ensures that the the utility source is stable before transferring from theemergency source.

Load Control 5 minutes Allows delayed connection of selected loads to the generator set.Prevents simultaneous starting of large motors after transfer to theemergency source. Recommended for delayed starting of airconditioners.

Engine Cooldown 5 minutes Runs the engine with no load after transfer from the generator set.Engine stops before the time delay expires if the temperature dropsbelow the cooled-down temperature level, or if the temperature risesduring the cooldown cycle.

Figure 2-9 Time Delays


2.10.4 Engine and Transfer Time Delays

The engine start and transfer time delays prevent

engine start and load transfer caused by brief variations

in the utility power source.

The engine cooldown time delay allows the engine to

run after the loads have been removed. The engine

stops before the cooldown time delay expires if the

temperature drops below the cooled-down temperature

level, or if the temperature rises during the cooldown

cycle.

2.10.5 Load Control Time Delay

The load control time delay allows delayed starting of

large motor loads (such as air conditioners), preventing

simultaneous starting of large motors after transfer to

the generator set. The load control time delay is fixed at

5 minutes. It is not adjustable.

The load must be connected to the load control output

on the interface board of the model RRT transfer switch.

See the transfer switch operation and installation

manual for connection instructions.

2.11 Event History

The last ten controller faults can be viewed from the

controller display when the controller is off. Each event

is displayed with the fault code followed by the engine

hours at which time the event occurred. During event

history viewing, the OFF LED flashes once per second.

Procedure to View Event History

1. Press and hold the OFF button for 3 seconds. The

first event appears on the screen. The OFF LED

flashes once per second.

2. Press the OFF button to cycle through the engine

hours and subsequent events. After cycling

through all ten events, the control automatically

turns off. The OFF LED flashes once every 2

seconds.

To stop viewing the event history before the last event,

press the down arrow or exercise button. The controller

will turn off.

TP-6734 5/10 29Section 3 Scheduled Maintenance

Section 3 Scheduled Maintenance

Accidental starting.Can cause severe injury or death.

Disconnect the battery cables beforeworking on the generator set.

Remove the negative (--) lead firstwhen disconnecting the battery.Reconnect the negative (--) lead lastwhen reconnecting the battery.

WARNING

Disabling the generator set. Accidental starting cancause severe injury or death. Before working on thegenerator set or connected equipment, disable the generatorset as follows: (1) Move thegenerator setmaster switch to theOFFposition. (2) Disconnect thepower to thebattery charger.

(3) Remove the battery cables, negative (--) lead first.Reconnect the negative (--) lead last when reconnecting thebattery. Follow these precautions to prevent starting of thegenerator set by an automatic transfer switch, remotestart/stop switch, or engine start command from a remote

computer.

Hazardous voltage.Can cause severe injury or death.

Operate the generator set only whenall guards and electrical enclosures

are in place.

Moving parts.

WARNING

Hot engine and exhaust system.Can cause severe injury or death.

Do not work on the generator set untilit cools.

WARNING

Servicing the exhaust system. Hot parts can causesevere injury or death. Do not touch hot engine parts. Theengine and exhaust system components become extremelyhot during operation.

3.1 Scheduled Maintenance

Refer to the following service schedules and the runtime

hours displayed on the controller display to schedule

routine maintenance. Intervals are shown in hours of

operation and/or time intervals (i.e. weekly, monthly,

quarterly, etc.) Have an authorized distributor/dealer

service the generator set at the designated intervals in

the service schedule for the life of the generator set.

Service units subject to extremeweather, long operating

hours, or dusty or dirty conditions more frequently.

Contact an authorized distributor/dealer for parts.

TP-6734 5/1030 Section 3 Scheduled Maintenance

3.1.1 Service Schedule, 14RES/RESL Models

System Component or ProcedureSee

Section

Procedure

Frequency

VisuallyInspect Check Change Clean Test

Fuel

Flexible lines and connections X R Quarterly

Main tank supply level X Weekly

Fuel piping X Yearly

Lubrication 3.2

Oil levelX X

8 hours orbefore use

Crankcase breather hose X Yearly or 500 hours

Change oil X Yearly or 100 hours

Replace filter X Yearly or 200 hours

Cooling 3.5

Air ducts, louvers X X Yearly

Exhaust Line 3.6

Leakage X X Weekly

Insulation, fire hazards X Yearly

Obstructions or combustible materials near exhaustoutlet

X Weekly

DC Electrical System 3.7

Battery charger operation, charge rate (if equipped) X Monthly

Remove corrosion, clean and dry battery and rack X X Yearly

Clean and tighten battery terminals and inspectboots

X X Yearly

Battery electrolyte level and specific gravity * X Yearly

AC Electrical System

Tighten control and power wiring connections X Yearly

Remote control system, if equipped X Monthly

Visible wear or damage X Quarterly

Wire abrasions where subject to motion X X Six Months

Wire-cable insulation condition X 3 Years or 500 hours

Engine and Mounting

Visible wear or damage X Weekly

Air cleaner and precleaner service 3.4 R Yearly or 100 hours

Spark plugs 3.3 X Yearly or 300 hours

Replace stepper motor coupling and bushing D 500 hours

Generator


Exercise generator set X Weekly

Brushes and collector ring D D Yearly

Measure and record resistance readings ofwindings with insulation tester (Megger, withSCR assembly or rectifier and load leadsdisconnected) *

D 3 Years

General Condition of Equipment

Evidence of vibration, leakage, excessive noise,temperature, or deterioration

X X X Weekly

Interior of sound enclosure X X Quarterly

* Not necessary for maintenance-free batteries.

Service more frequently under extremely dusty/dirty conditions.

Megger is a registered trademark of Biddle Instruments.

X Action

D Authorized distributor/dealer onlyR Replace as necessary


3.1.2 Service Schedule, 20RES/RESL Models

System Component or ProcedureSee

Section

Procedure

Frequency

VisuallyInspect Check Change Clean Test

Fuel

Flexible lines and connections X R Quarterly

Main tank supply level X Weekly

Fuel piping X Yearly

Lubrication 3.2

Oil level X 8 hours orbefore each use

Change oil X Yearly or 150 hours

Replace filter X Yearly or 150 hours

Crankcase breather hose X Yearly or 500 hours

Oil cooler X X Yearly or 100 hours

Cooling 3.5

Air ducts, louvers X X Yearly

Exhaust System 3.6

Leakage X X Weekly

Insulation, fire hazards X Yearly

Obstructions or combustible materials nearexhaust outlet

XWeekly

DC Electrical System 3.7

Battery charger operation, charge rate X Monthly

Remove corrosion, clean and dry battery andrack

X XYearly

Clean and tighten battery terminals and inspectboots

X XYearly

Battery electrolyte level and specific gravity * X Yearly

AC Electrical System

Tighten control and power wiring connections X Yearly

Remote control system, if equipped X Monthly


Wire abrasions where subject to motion X X Six Months

Wire-cable insulation condition X 3 Years or 500 hours

Engine and Mounting

Visible wear or damage X Weekly

Air cleaner service 3.4 150 300 Yearly or hours shown

Spark plugs 3.3 150 300 Yearly or hours shown

Replace stepper motor coupling and bushing D 500 hours

Generator


Exercise generator set W Weekly

Brushes and collector ring D D Yearly

Measure and record resistance readings ofwindings with insulation tester (Megger, withSCR assembly or rectifier and load leadsdisconnected)

D 3 Years

General Condition of Equipment

Evidence of vibration, leakage, deterioration,unusual or excessive noise or temperature

X X X Weekly

Interior of sound enclosure X X Quarterly

* Not necessary for maintenance-free batteries.

Service more frequently under extremely dusty/dirty conditions.

Megger is a registered trademark of Biddle Instruments.

X Action

D Authorized distributor/dealer onlyR Replace as necessary


3.2 Lubrication System

See the service schedules in Section 3.1 for oil change

and oil filter replacement intervals. See the service

views in Section 1.7 for the oil drain, oil check, oil fill, and

oil filter locations.

3.2.1 Low Oil Pressure Shutdown

The low oil pressure (LOP) shutdown feature protects

the engine against internal damage if the oil pressure

drops below a minimum pressure because of oil pump

failure or other malfunction.

Note: The LOP shutdown feature does not protect

against damage caused by operating when the

oil level is low; it is not a low oil level shutdown.

Check the oil level regularly, and add oil as

needed.

3.2.2 Oil Check

The generator set is shipped with oil. Before operating

the generator set, check the engine oil in the crankcase.

See Figure 3-1.

Maintain the oil level at or near, not over, the full mark on

the dipstick. Add 5W-30 synthetic oil when the oil level is

low.

Check the oil level before each use. For extended

operation, check the oil level every 8 hours. Do not

check the oil level when the generator set is running.

Shut down the generator set and wait several minutes

before checking the oil.

6515

Figure 3-1 Oil Check (typical)

3.2.3 Engine Oil Recommendation

Use 5W-30 API (American Petroleum Institute) Service

Class SG, SH, or SJ synthetic oil. Synthetic oil oxidizes

and thickens less than other oils and leaves the engine

intake valves and pistons cleaner.

3.2.4 Oil Change Procedure

Note: Dispose of all waste materials (engine oil, fuel,

filter, etc.) in an environmentally safe manner.

Drain the oil while it is still warm.

1. Drain the oil.

a. Press the OFF button on the generator set

controller.

b. Disconnect the power to the battery charger.

c. Disconnect the generator set engine starting

battery, negative (--) lead first.

d. Remove the housing side panel.

e. Clean the area around the dipstick and oil fill

cap.

f. Remove the oil drain hose from its retaining

clip. Remove the cap from the oil drain hose

and lower the hose into an oil collection

container.

g. Open the oil drain valve on the engine.

h. Remove the dipstick and oil fill cap. Allow time

for the engine oil to drain completely.

i. Close the oil drain valve. Replace the cap on

the oil drain hose. Replace the oil drain hose in

its retaining clip.

j. Replace the dipstick.

2. Replace the oil filter.

a. Clean the area around the oil filter. Remove the

oil filter by rotating it counterclockwise with an

oil filter wrench.

b. Clean the gasket sealing surface of the oil filter

adapter.

c. Apply a light coat of clean oil to the rubber seal

of the new oil filter.

d. Install the new oil filter following the instructions

provided with the filter.


3. Fill with oil.

a. Fill the engine to theFmarkon thedipstick. The

engine oil capacity is shown in Figure 3-2. See

Section 3.2.3, Engine Oil Recommendation,

for oil selection.

Generator Set Model Oil Capacity, L (qt.)

14RES/RESL 1.9 (2.0)

20RES/RESL 2.8 (3.0)

Figure 3-2 Engine Oil Capacity

b. Reinstall the dipstick and the oil fill cap.

c. Check that the generator set master switch is in

the OFF position.

d. Reconnect the generator set engine starting

battery, negative (--) lead last.

e. Reconnect the power to the battery charger.

f. Start and run the generator set for a minute to

allow the oil pressure to reach operating range.

g. Stop the generator set, wait 1 minute, and then

recheck the oil level. Add oil to bring the level

up to the F mark on the dipstick.

4. Check for leaks.

a. Check for oil leaks.

b. Fix leaks and recheck the oil level.

c. Reinstall the housing side panel.

3.2.5 Oil Cooler 20RES/RESL

Inspect and clean the oil cooler at the intervals indicated

in the service schedule. The oil cooler must be kept free

of debris.

See Figure 3-3 for the oil cooler location. The oil cooler

is located under the No. 2 cylinder shroud. Remove the

top mounting screw and loosen the two side screws,

then lift off the cylinder shroud.

Clean the outside of the oil cooler fins with a brush or

with compressed air.

162 590 011. Oil cooler

Figure 3-3 Oil Cooler Location


3.3 Spark Plugs

Reset the spark plug gap or replace the plugs with new

plugs as necessary.

1. Clean the area around the base of the spark plug to

keep dirt and debris out of the engine.

2. Remove the spark plug and check its condition.

Replace the spark plug if it is worn or if its reuse is

questionable.

3. Check the spark plug gap using a wire feeler

gauge. See Figure 3-4 for the recommended

spark plug gap. Adjust the gap by carefully bending

the ground electrode. See Figure 3-5 and

Figure 3-6.

4. Reinstall the spark plug into the cylinder head.

Torque the spark plug to 24.4--29.8 Nm

(18--22 ft. lb.)

Generator Set Model Spark Plug Gap

14/20RES/RESL 0.76 mm (0.030 in.)

Figure 3-4 Spark Plug Gap

1--514

Figure 3-5 Checking the Spark Plug Gap

1--511

Figure 3-6 Adjusting the Spark Plug Gap

3.4 Air Cleaner Service

3.4.1 Air Cleaner, 14RES/RESL Models

The engine has a replaceable high-density paper air

cleaner element with an oiled foam precleaner. See

Figure 3-7.

1

2

3

4

5

6

7

586536

1. Cover knob

2. Air cleaner cover3. Element cover nut

4. Element cover

5. Foam precleaner6. Air cleaner element

7. Air cleaner base

Figure 3-7 Air Cleaner Components

Check for a buildup of dirt and debris around the air

cleaner system. Keep this area clean. Also check for

loose or damaged components. Replace all bent or

damaged air cleaner components.

Note: Operating the engine with loose or damaged air

cleaner components could allow unfiltered air

into the engine causing premature wear and

failure.

Precleaner Service

Use the following procedure to wash and reoil the

precleaner as indicated in the service schedule. Wash

and reoil the precleaner more often under

kohler 14 20 res operation

Documents

service views

service schedule

identification numbersrecord

automatic operation

transfer switch controllers

controller power

service parts

test cycle