oilgear type “pvg” pumps - -048/-065/-075 (series...

Bulletin 947023 THE OILGEAR COMPANY 1

OILGEAR TYPE “PVG” PUMPS - -048/-065/-075 (SERIES F1U)

SERVICE INSTRUCTIONS

Figure 1. Typical Oilgear “PVG” Open Loop Pump

PURPOSE OF INSTRUCTIONSThese instructions will simplify the installation,operation, maintenance and troubleshooting ofOilgear type “PVG” pumps.

Become familiar with the construction, principle ofoperation and characteristics of your pump to helpyou attain satisfactory performance, reduce shut-down and increase the pump's service life. Somepumps have been modified from those described inthis bulletin and other changes may be madewithout notice.

REFERENCE MATERIALFluid Recommendations .....................................................................................Bulletin 90000Contamination Evaluation Guide.........................................................................Bulletin 90004Filtration Recommendations ...............................................................................Bulletin 90007Piping Information ...............................................................................................Bulletin 90011Installation of Vertically Mounted Axial Piston Units ...........................................Bulletin 90014PVG Open Loop Pumps, Sales........................................................................ Bulletin 47019-I

Pump Control Instructions, Series F1U“P-1NN” Single Pressure Compensator ............................................................Bulletin 947651“P-1NN/F” Single Pressure Compensator w/Load Sense.................................Bulletin 947652“P-1NN/H” Single Pressure Compensator w/H.P. Limiter ....................................Bulletin 947653“P-1NN/G” Horsepower Limiter w/Load Sense .................................................Bulletin 947654“P-2” Dual Pressure Compensator....................................................................Bulletin 947655“P-C” Single Pressure - Soft Start.....................................................................Bulletin 947656“P-A” or “P-B” Electronic Pressure Compensator .......................Bulletins 947556 and 947657“P-CNN/H” Single Pressure - Soft Start w/H.P. Limiter ...............Bulletins 947558 and 947658“P-2NN/H” Dual Pressure Compensator w/H.P. Limiter ..............Bulletins 947559 and 947659“V-S25” Electro Hydraulic Servo Valve..............................................................Bulletin 947560“V-M20” Electro Hydraulic Servo Valve .............................................................Bulletin 947561

OILG0457

Bulletin 947023

November 2009

THE OILGEAR COMPANY2300 South 51st Street

Milwaukee, Wisconsin 53219www.oilgear.com

Bulletin 947023

2 THE OILGEAR COMPANY Bulletin 947023

Read and understand this entire instruction sheetbefore repairing, or adjusting your Oilgear product.

Those who use and maintain this equipment mustbe thoroughly trained and familiar with the product.If incorrectly used or maintained, this product andits equipment can cause severe injury.

SAFETY SYMBOLSThe following signal words are used in thisinstruction sheet to identify areas of concern whereyour safety may be involved. Carefully read the textand observe any instructions provided to ensureyour safety.

THIS SIGNAL WORD INDICATES ANIMMINENTLY HAZARDOUS SITUATIONWHICH, IF NOT AVOIDED, WILL RESULT INDEATH OR SERIOUS INJURY.

This signal word indicates a potentiallyhazardous situation which, if not avoided,could result in death or serious injury.

This signal word indicates that a potentiallyhazardous situation exists which, if notavoided, may result in damage toequipment or minor personal injury.

While not directly relevant to the topic beingdiscussed, the NOTE is used to emphasizeinformation provided, or provide additionalinformation which may be of benefit.

This service information is designed forthe maintenance of your Oilgear product.It contains the information on the correctprocedures determined by Oilgear for thesafe manner of servicing. Always keepthis instruction sheet in a location where itis readily available for the persons whouse and maintain the product. Additionalcopies of this instruction sheet areavailable through the Oilgear Company.Or visit our website: www.oilgear.com.Please contact us if you have anyquestions regarding the information inthis instruction bulletin.

The cleanliness of working on this pump orthe hydraulic system is extremelyimportant to the safety and reliability of thepump and the system. Always make surethe fittings are clean on the outside beforeremoving them from their connections, arecapped and plugged when removed andplaced in a clean rag or container until theyare reinstalled.

Some service operations may requirespecial tools or equipment. If you requireinformation on these items, please contactOilgear before attempting these repairsand service operations.

Read, understand, and follow the safetyguidelines, dangers, and warningscontained in this instruction sheet topromote reliable operation and preventserious personal injury.

DO NOT attempt to service this machineryin an environment where safety regulationsare not established and in place.

DO NOT operate the hydraulic system if aleak is present. Serious injury may result.

Hydraulic systems operate under very highpressure. Hydraulic fluid escaping from apressurized system can penetrateunprotected body tissue. DO NOT inspectfor hydraulic leaks with bare hands or otherexposed body parts. As a minimum, wearleather gloves prior to inspecting for leaksand use cardboard or wood. If leaks arepresent, relieve pressure and allow systemto cool prior to servicing. If injured byescaping hydraulic oil, contact a physicianimmediately. Serious complications mayarise if not treated immediately. If you havequestions regarding inspecting forhydraulic leaks, please contact Oilgearprior to servicing.

DANGER

! WARNING

CAUTION

NOTE

! WARNING

NOTE

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

Safety First

© 2009 THE OILGEAR COMPANY - ALL RIGHTS RESERVED


Hydraulic hoses and tubing must beinspected on a daily basis for leaks, cuts,abrasions, damage and improperclearance along any mounting frame forhidden damage before the unit is put intoservice. Replace damaged hoses or hosesyou suspect are damaged before thesystem is returned to service! Hoses mustbe replaced every two years. Failure toproperly inspect and maintain the systemmay result in serious injury.

Hydraulic systems are hot. DO NOTTOUCH! Serious personal injury mayresult from hot oil. When you havecompleted working on the hydraulicsystem, thoroughly clean any spilled oilfrom the equipment. Do not spill anyhydraulic fluids on the ground. Clean anyhydraulic fluids from your skin as soon asyou have completed maintenance andrepairs. Dispose of used oil and systemfilters as required by law.

Use correct hoses, fittings, and adapterswith the correct SAE rating whenreplacing hoses to prevent possibleserious injury. Always replace hoses,fittings, and adapters with replacementsthat have a proper, suitable, workingpressure rating. Replacement hoses mustbe of the correct length and must complywith the hose manufacturer’s andOilgear’s installation guidelines andrecommendations.

Hydraulic hoses have the SAE ratingsmarked on the hose to assist you inselecting the correct hose. The samemanufacturer must supply any replacementhydraulic hoses and fitting assemblies. Asan example: Brand “X” hose and brand “Y”fitting will not normally be compatible. No“Twist” is allowed in the hydraulic hoses.“Twist” may result in premature hosefailure. This can cause serious injury.Please contact Oilgear for assistance whenrequired.

Hydraulic cylinders can be holding afunction in a certain position when thepump is OFF. An example of this is afunction being held in the lift or partial liftposition by the cylinders. If a hydraulicline is removed or the hydraulic circuits orcontrols are being worked on, gravity mayallow the function being held in position todrop. All workers and personnel mustremain clear of these areas when workingon or operating the hydraulic system.Block and secure all devices andfunctions which apply before beginningwork or operation. Failure to comply withthis can result in serious injury or death.

Any hydraulic pipe which is replaced mustconform to SAE J1065 specifications. Ifincorrect hydraulic pipe is installed, thehydraulic system may fail, causingserious injury. Damaged or leakingfittings, pipes or hoses must be replacedbefore the system is returned to service.

DO NOT heat hydraulic pipe. The carboncontent of this steel tube is such that ifheated for bending, and either water or airquenched, the pipe may lose its ductilityand thereby be subject to failure underhigh pressure conditions. Serious injurycan result. Damaged or leaking pipes mustbe replaced before the system is returnedto service. Please contact Oilgear if yourequire assistance or have questions.

All hydraulic pressure must be relievedfrom the hydraulic system prior to removingany components from the system. Torelieve the hydraulic pressure from thehydraulic system, turn off the motor andoperate the control panel with the key in theON position. Failure to comply can result inserious injury. If you have any questionsconcerning relieving the hydraulic pressurefrom the system, please contact Oilgear.

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

Safety First


Hydraulic components can be heavy. Usecaution while lifting these components.Serious personal injury can be avoidedwith proper handling of the components.

Please contact Oilgear if you requireassistance, when performing hydraulictest procedures, use the proper hydraulicgauges. Installing an incorrect test gaugecould result in serious injury if the gaugefails. Use properly rated hydraulic hosesto allow the test gauge to be read awayfrom moving parts and functions.

Increasing hydraulic pressure beyond therecommendations may result in seriousdamage to the pump and system orserious personal injury and may void theOilgear Warranty. If you have questionsconcerning hydraulic pressures or testingprocedures, please contact Oilgear beforeattempting the test procedures or makingadjustments.

An Oilgear pump must not be modified inany way without authorization fromOilgear. Modifications may not complywith safety standards, including ANSIsafety standards, and may result inserious personal injury. Please contactOilgear if you require assistance.

DO NOT enter under hydraulic supportedequipment unless they are fully supportedor blocked. Failure to follow this procedurecan result in serious injury or death.

Any Oilgear pump safety decals must bereplaced anytime they are damaged,missing, or cannot be read clearly. Failureto have proper decals in place can resultin serious injury or death. (If you requiresafety decals, please contact Oilgear forreplacement safety decals, at no charge.)

Be sure everyone is clear of the areaaround the hydraulic system beforeoperating after servicing. Remain attentiveat all times when operating to check yourwork until you are completely sure it issafe to return to service. Failure to heedthis warning may result in seriouspersonal injury or death.

Wear the proper protective clothing whenoperating, servicing or maintaining thehydraulic system or the Oilgear pump. Wearthe correct protective gear, safety glasses,gloves, and safety shoes. Serious injurycan result without proper protective gear.

Make sure to keep hands and feet andother parts of your body clear of revolvingor moving parts. Failure to comply cancause serious injury.

DO NOT wear watches, rings, or jewelrywhile working with electrical andmechanical equipment. These items canbe hazardous and can cause serious andpainful injuries if they come into contactwith electrical wires, moving parts, orhydraulic equipment.

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

! WARNING

Safety First


PREPARATION AND INSTALLATION

MOUNTING

Pump Without Reservoir - The pump can bemounted in any position. But, the recommendedmounting position is with the drive shaft on ahorizontal plane and the case drain port 1 on thetop side. Secure the pump to a rigid mountingsurface. Refer to the referenced Oilgear PipingInformation Bulletin 90011.

Pump With Reservoir - These pumps are usuallyfully piped and equipped. It may be necessary toconnect to a super-charge circuit when used.Mount reservoir on level foundation with thereservoir bottom at least six inches above floorlevel to facilitate fluid changes.

PIPING AND FITTINGS

Refer to the referenced Oilgear Piping InformationBulletin 90011 and individual circuit diagram beforeconnecting the pump to the system. Inlet velocitymust not exceed 5 fps (1,5 mps). Inlet should beunrestricted and have a minimum of fittings.

DO NOT use an inlet strainer.

Arrange line from “case drain” so the case remainsfull of fluid (non-siphoning). Case pressure must beless than 25 psi (1,7 bar). For higher casepressures, special shaft seals are required; contactour Customer Service. Each drain line must be aseparate line, unrestricted, full sized andconnected directly to the reservoir below the lowestfluid level. Make provisions for opening this linewithout draining (siphoning) reservoir.

Running the pump in NEUTRAL position(zero delivery) for extended periodswithout a supercharge circuit can damagethe pump. The system and pump must beprotected against overloads by separatehigh pressure relief valves. Install bleedvalve(s) at the highest point(s) in system.

POWER

Power is required in proportion to volume andpressure used. Motor size recommendations forspecific applications can be obtained from TheOilgear Company. Standard low starting torquemotors are suitable for most applications.

DO NOT start or stop unit under loadunless system is approved by Oilgear. Itmay be necessary to provide deliverybypass in some circuits.

DRIVE

Verify rotation direction plate on the pump's housing.Clockwise pumps must be driven clockwise andcounterclockwise pumps must be drivencounterclockwise. Use direct drive coupling. Sizeand install coupling per manufacturer's instructions.

DO NOT drive the coupling onto the pumpdrive shaft. If it is too tight, it may benecessary to heat coupling for installation.Refer to manufacturer's instructions.

Misalignment of pump shaft to driver's shaft shouldnot exceed 0.005 inches (0,13 mm) Total IndicatorReadout (TIR) in any plane.

NOTE

! WARNING

CAUTION

CAUTION

Service Instructions


FILTRATION

Keep the fluid clean at all times to ensure long lifefrom your hydraulic system. Refer to the referencedOilgear Filtration Recommendations bulletin 90007and Oilgear Contamination Evaluation GuideBulletin 90004. Oilgear recommends use of a filterin the pressure or return line. Replace filterelement(s) when the filter condition indicatorreaches change area at normal fluid temperature.Drain and thoroughly clean filter case. Usereplacement element(s) of same beta 10 ratio(normally a ratio of 4 with hydraulic oils).

FLUID COOLING

When the pump is operated continuously at therated pressure or frequently at peak load, auxiliary cooling of the fluid may be necessary. Fluidtemperature should not exceed limits specified inthe referenced Oilgear Fluid RecommendationsBulletin 90000.

AIR BREATHER

On most installations, an air breather is mountedon top of fluid reservoir. It is important for thebreather to be the adequate size to allow air flow inand out of reservoir as fluid level changes. Keepthe breather case filled to the “fluid level” mark.About once every six months, remove cover, washscreen in solvent and allow screen to dry, cleanand refill case to level mark and install screen.Refer to the manufacturer's recommendations.

FLUID, FILLING AND STARTING RECOMMENDATIONS

Refer to instruction plate on the unit, reservoir,machine and/or reference Fluid Recommendationsbulletin. Fire-resistant fluids and phosphate esterfluids can be used in accordance with fluidmanufacturer's recommendations.

1. Pump all fluid into reservoir through a clean(beta 10 ratio of 4 or more) filter. Fill reservoirto, but not above, “high level” mark on the sightgauge.

2. Remove case drain line and fill pump casewith hydraulic fluid.

3. Turn drive shaft a few times by hand with aspanner wrench to make sure parts rotate.Torque to turn drive shaft should be 9 to 24 ft•lb(12 to 32 N•m).

With pump under “no load” or with pump control atNEUTRAL:

4. Turn drive unit ON and OFF several timesbefore allowing pump to reach full speed. Thesystem can usually be filled by running thepump and operating the control.

5. The fluid level in the reservoir should decrease.Stop the pump. DO NOT allow the fluid level togo beyond the “low level.” If the level reaches“low level” mark, add fluid and repeat step.

With differential (cylinder) systems, the fluidmust not be above “high level” when theram is retracted or below “low level” whenextended. Bleed air from the system byloosening connections or opening petcocksat the highest point in the system. Closeconnections or petcocks tightly when solidstream of fluid appears.

CONSTRUCTION

See Figure 3.

1. A drive shaft (301) runs through the center lineof pump housing (001) and valve plate (401)with the pump cylinder barrel (101) splined to it.

2. A bearing (306) supports the outboard end ofthe drive shaft and a bushing supports theinboard end. (The bushing is part of valve plate assembly.)

3. The pump cylinder barrel is carried in apolymerous (journal type) cylinder bearing(202).

4. The valve plate (401) has two crescent shapedports.

5. The pumping piston/shoe assemblies (102) inthe cylinder barrel are held against aswashblock (201) by a shoe retainer (104).

6. The shoe retainer is held in position by thefulcrum ball (103) which is forced outward bythe shoe retainer spring (105).

7. The spring acts against the pump cylinderbarrel, forcing it against the valve plate whilealso forcing the piston shoes against theswashblock.

8. The semi-cylindrical shaped swashblock limitsthe piston stroke and can be swiveled in arc-shaped saddle bearings (204).

9. The swashblock is swiveled by a control(included in referenced material). Refer toPRINCIPLE OF OPERATION.

NOTE


PRINCIPLE OF OPERATIONThe illustrations show the pump driven clockwise(right hand) from the top (plan) view.

Figure 2. Cut-a-way of a Typical “PVG” Pump

Position B, Pump During Full Delivery from PORT B - Figure 3

Rotating the drive shaft (301) clockwise turns thesplined cylinder, which contains the pumpingpistons (102). When the cylinder rotates, thepistons move in and out within their bores as theshoes ride against the angled (C) swashblock(201).

As the cylinder rotates, the individual piston boresare connected, alternately, to the crescent-shapedupper (port A) and lower (port B) in the valve plate.While connected to the upper side (suction) port A,each piston moves outward (OUT), drawing fluidfrom port A into the piston bore until its outermoststroke (D) is reached. At this point, the piston borepasses from the upper crescent port A to the lowercrescent port B.

While rotating across the lower crescent, eachpiston moves across the angled swashblock faceand then each piston is forced inward (IN). Eachpiston then displaces fluid through the lowercrescent to port B until its innermost stroke (D) isreached. At this point, the piston bore passes fromthe lower to the upper crescent again and the cycleis repeated.

Figure 3. Position B, Pump During Full Delivery from Port B

OILG0363

BA

105 401

306202

OIL_0001

001


Position B/2, Pump During One Half Delivery from PORT B - Figure 4

This illustration shows that the angle (E) of theswashblock determines the length of the pistonstroke (F), (the difference between outermost andinnermost position) which determines the amountof delivery from the pump. In this case, the strokeangle (E) is one-half of the stroke, which means thepiston stroke is one-half and the pump delivery isone-half.

Position N, Pump in Neutral, No Stroke, No Delivery - Figure 5

Neutral position results when the control centersthe swashblock. The swashblock angle (G) is nowzero and swashblock face is parallel to the cylinderface. There is no inward or outward motion of thepump pistons as piston shoes rotate around theswashblock face. With no inward and outwardmotion or no stroke (H) NEUTRAL, no fluid is beingdisplaced from the piston bores to the crescents inthe valve plate and there is no delivery from pumpports.

Illustration reference numbers match thepart item number in the parts list.

Figure 4. Position B/2, Pump During One Half Delivery from Port B

Figure 5. Position N, Pump in Neutral, No Stroke, No Delivery

Refer to SPECIFICATIONS

NOTE

FE

IN

OUT

OILG-0002

A

A

A

B

GH

NEUTRAL

NEUTRAL

OILG-0003

A

A

A

B


SPECIFICATIONS

Refer to reference material, pump controlmaterial and individual application circuitfor exceptions.

Case pressure should be less than 25 psi (1,7 bar). For higher pressure, consult factory.Higher speeds available - consult factory.

Table 1. Nominal Performance Data with 150-300 SSU Viscosity Fluids

All dimensions (without controls) are approximate. For detailed dimensions, contact your Oilgear Representative.* Weight with P Control and rear port valve plate

Table 2. Nominal Dimensions and Weights Without Controls

Refer to installation drawings for more detailed dimensions and port configurations.

NOTE

Unit

THEORETICALMAXIMUM

DISPLACEMENT

RATED CONTINUOUS

PRESSURE

MAXIMUMPRESSURE

FLOW RATE at1800 rpm rated

continuous pressureand 14,7 psia (bar abs)

inlet condition

MAXIMUMSPEED

POWER INPUT at rated

continuous pressure & 1800 rpm

in3/rev ml/rev psi bar psi bar gpm l/mi rpm hp kw

PVG 048 2.93 48,0 5000 344,8 5800 400,0 21.1 79,9 2700 73 54,5PVG 065 3.98 65,0 5000 344,8 5800 400,0 28.8 108,9 2700 100 74,6

PVG 065 4.60 75,4 3750 258,6 4250 293,1 33.3 126,0 2700 89 66,4

UnitLength Width Height Weight

Face Mountinginches mm inches mm inches mm lbs. kg

PVG 048, 065, 075 12.0 304,8 6.9 175,3 6.3 160,0 66* 30 SAE “B” 2 bolt


TROUBLESHOOTINGPROBLEM CAUSES REMEDY

Unresponsive or Sluggish Control

Low control input (pilot) pressure for “R” and “V” volume type controls only.

Refer to referenced control instruction material.

Swashblock saddle bearings (204) worn or damaged. Inspect bearings. Replace.

Insufficient PumpVolume

Delivery limited by faulty control Refer to appropriate control instruction material.

Obstructed suction circuit or insufficient supercharge volume. Inspect for obstruction and verify supercharge.

Insufficient drive motor speed. Refer to appropriate power material.

Worn or grooved cylinder barrel (101) and/or valve plate (401) mating surfaces.

Inspect components. Replace.Worn piston/shoe assemblies (102) or piston bores in cylinder (101).

Worn or damaged piston shoe or swashblock (201).

Irregular orUnsteady Operation

Faulty control.Inspect components. Replace. Refer to referenced pump control instruction materials.

Fluid level in reservoir is low or supercharge is insufficient. Verify fluid level and/or supercharge.

Air entering hydraulic system. Inspect system for leak.

Worn axial piston pump. Inspect components. Replace.

Faulty output circuit components (cylinder, motors, valves or other related components).

Inspect components. Replace.

Loss of Pressure

Worn piston pump.

Inspect components. Replace.

Worn or grooved cylinder barrel (101) and/or valve plate (401) mating surfaces.

Worn piston/shoe assemblies (102) or piston bores in cylinder.

Faulty output circuit components.

Excessive or High Peak Pressure

Faulty output circuit components. Check the relief valves.

Excessive Noise

Pump stopped or started incorrectly under load. Verify operation procedure of pump.

Low fluid level in reservoir or insufficient supercharge causing cavitation.

Verify fluid level and/or supercharge.


Fluid too cold or viscosity too high. Verify fluid temperature and/or type.

Suction line problem, i.e., obstructions in line, line too long, line diameter too small or too many bends and/or loops in line.

Inspect line for obstruction.

Broken or worn piston/shoe assembly (102). Inspect components. Replace.

Pump rotating in wrong direction. Inspect operation direction of pump.

Excessive Heating

Operating pump above rated or peak pressure. Verify pump limitations.

Low fluid level in reservoir or insufficient supercharge. Verify fluid level and/or supercharge.


Worn piston pump.

Inspect components. Replace.Worn or grooved cylinder barrel (101) and/or valve plate (401) mating surfaces.

Faulty output circuit components (continuous blowing relief valves or "slip" through valves, cylinder or other components).

Insufficient cooling provision or clogged coolers. Inspect for obstruction.


TESTING AND ADJUSTING

Shut the pump OFF and release pressurefrom the system before disassemblingcomponents. Failure to comply with theseinstructions could result in personal injuryor death. Blocking the pressure linebetween the pump and the system (orpump) high pressure relief valve will resultin damage and could result in seriouspersonal injury.

PISTON PUMP

To check for a worn piston pump, make a leakmeasurement test from the case drain while thepump is under pressure. After the unit is warm,either install a flow meter in the drain line or havethe flow from the drain line directed into a largecontainer or reservoir. The pump case must remainfull of fluid during this test.

DO NOT run a pump on stroke against ablocked output unless it is protected by ahigh pressure relief valve and then run nolonger than necessary to check slip. Limitdischarge to prevent dropping reservoirfluid below low level.

With an accurate high pressure gauge in thepressure line, start the pump and stall (or block)output device to raise system pressure tomaximum (as set by system relief valve). Read themeasurement on the flow meter or time andmeasure the case drain flow to fill a known sizecontainer and calculate the flow rate.

Additional leakage indicates wear, butdoes not become critical until it impairsperformance.

DISASSEMBLY

The cleanliness of working on this pump orthe hydraulic system is extremely importantto the safety and reliability of the pump andthe system.

When disassembling or assembling thepump, choose a clean, dry and dust- andsand-free area where no traces of abrasiveparticles are in the air which can damagethe pump and system. DO NOT work nearwelding, sandblasting, grinding benches orsimilar conditions.

Always make sure the fittings are clean onthe outside before removing them fromtheir connections. Make sure they arecapped and plugged when removed. Placethem on a clean surface and in a clean ragor container until they are reinstalled.When cleaning parts which have beendisassembled, it is important to useCLEAN cleaning solvents and parts areallowed to dry. All tools and gauges shouldbe clean prior to working with the systemand use new, CLEAN lint-free rags tohandle and dry parts.

DO NOT attempt to remove or install anycomponents or assembly while the pumpand system is running. Always stop thepump, shut OFF the power and releasepressure from the system before servicingor testing. Be sure provisions have beenmade so the case drain line can bedisconnected from the unit withoutcausing the line to drain (siphon) thereservoir.

! WARNING

CAUTION

NOTE

NOTE

! WARNING


1. Disconnect case drain line from port 1 or 1A.

2. Drain pump case through the remaining (port 1or 1A) on the bottom of case. If plugs areinaccessible, it may be necessary to removethe pump from the mounting and drive motorbefore draining it.

3. After removing the pump from the mountingand before disassembly, cap or plug all portsand clean the outside of unit thoroughly toprevent dust from entering the system. SeeFigures 8 and 9.

Depending on what part or parts are to beinspected, it may not be necessary tocompletely take apart all assemblies.

CONTROL GROUP

Refer to the reference material for the informationwhich applies to the control your pump is equippedwith. Some force is required to remove the controlhousing.

1. Remove socket head cap screws.

2. Lift the control group assembly, with control pin,straight up from the top of the pump assembly.The control pin may or may not remain in theswashblock (201).

3. Remove control O-rings from the pumphousing.

VALVE PLATE GROUP

If another pump is coupled to thru-shaft pumps, itwill be necessary to remove coupling half beforeremoving valve plate.

1. Block the pump on a bench with the drive shaftfacing down.

2. Remove the valve plate (401) by removing fourcap screws (403) and lifting it straight up.

3. Remove valve plate O-ring (404) and (411).

NOTE


ROTATING GROUP

The rotating group is heavy. Be careful notto damage cylinder wear surface whichmates against the valve plate, bearingdiameters or piston shoes. Use properlifting techniques and assistance fromothers to prevent personal injury.

On thru-shaft pumps, the tailshaft bushingassembly (307, 308, 309) or a coupling will have tobe removed (a “jacking” screw can be used) beforethe rotating group can be disassembled.

1. Place the pump in a horizontal position.

2. Remove the rotating group by turning shaft(301) slowly, while pulling the cylinder barrel(101) from the housing.

3. Identify (number) each pump piston shoeassembly (102) and its respective bore in thecylinder barrel (101) and shoe retainer (104) foreasy reassembly.

4. See Figure 6. Lift out shoe retainer (104) withpistons (102) and remove the fulcrum ball (103)and shoe retainer spring (105).

Figure 6. Rotating Group Disassembly (5V-12015-L)

5. Remove retaining ring (208) and plug (205) andpull the hydrodynamic bearing (202) from thehousing.

DRIVE SHAFT GROUP

1. Remove the drive key (303), if used, and thedrive shaft bearing retainer ring (305).

2. Grasp outboard end of drive shaft (301) andpull it out of the pump housing.

3. Remove the shaft seal retainer (302) and shaftseal (007) from the housing only if necessary.

SWASHBLOCK GROUP

Reach inside the case through control mountingopening and remove the swashblock (201) andsaddle bearings (204).

INSPECTIONClean all parts thoroughly and allow them to dry.Inspect all seals and O-rings for hardening,cracking or deterioration. Replace if necessary or ifyou suspect damage. Check all locating pins fordamage and springs for cracking or signs of wear.

Wear proper protective gear when usingsolvents or compressed air, servicing ormaintaining the hydraulic system or theOilgear pump. Wear correct protectivegear, safety glasses, gloves and safetyshoes. Serious injury can result withoutproper protective gear.

CONTROL GROUP

Refer to the reference material on pump controls.Be sure to carefully check the control pin for cracksand/or signs of fatigue. Check fit of the pin in theswashblock. It should be a slip-fit without side-play.Replace if necessary or if you suspect damage.

! WARNING

104

102

103

105

101

OILG-0004

! WARNING


VALVE PLATE GROUP

Inspect the valve plate (401) surface which mateswith the cylinder barrel (101) for excessive wear.Remove minor defects by lightly stoning thesurface with a hard stone which is flat to within0.001 inches (0,03 mm).

Be sure to stone lightly. Any excessivestoning will remove the hardened surface.If wear or damage is extensive, replace thevalve plate.

ROTATING GROUP

Inspect cylinder barrel (101) piston bores and theface which mate with the valve plate for wear.Remove minor defects on the face by lightlystoning or lapping the surface.

Inspect the cylinder bearing (202) for damage andreplace if necessary. Check all piston and shoeassemblies (102) to be sure they ride properly onthe swashblock.

Be sure to stone lightly. Any excessivestoning will remove the hardened surface.If wear or damage is extensive and defectscannot be removed, replace the cylinderbarrel.

See Figure 7. Check each shoe face for nicks andscratches, and the shoe for smooth pivot action onthe piston.

If one or more piston/shoe assembly needsto be replaced, replace all the piston/shoeassemblies. When installing new piston/shoe assemblies or the rotating group,make sure the pistons move freely in theirrespective bores.

Figure 7. Piston and Shoe Inspection (5V-12015-L)

(A) All shoes must be equal within 0.001 inches(0,025 mm) at this dimension.

(B) All shoe faces must be free of nicks.

End play should not exceed 0.003 inches(0,076 mm) when new or 0.006 inches(0,152 mm) when worn.

SWASHBLOCK GROUP

Inspect the swashblock (201) for wear. If defectsare minor, stone the swashblock lightly. If damageis extensive, replace the swashblock.

Check the small hole in the face of theswashblock. The hole provides “porting” for thehydrostatic balance fluid of the piston/shoeassembly to be channeled through the swashblockto the face of the saddle bearing, providingpressure lubrication.

Compare the saddle bearing (204) thickness in aworn area to thickness in an unworn area. Replacesaddle bearings if the difference is greater than0.015 inches (0,4 mm).

Check the mating surface of swashblock for cracksor excessive wear. The swashblock movement inthe saddle bearings must be smooth. Replace ifnecessary.

Be sure to stone lightly. Any excessivestoning will remove the hardened surface.If wear or damage is extensive and defectscannot be removed, replace if necessaryor if you suspect them of being bad.

NOTE

NOTE

NOTE

B

A

OILG-0005

NOTE

NOTE


DRIVE SHAFT GROUP

Check:

• the shaft seal (007) for deterioration orcracks. Replace if necessary (press-out).

• the shaft bearing (306) for galling, pitting,binding or roughness.

• the rear shaft bushing in valve plate.

• the shaft and its splines for wear. Replaceany parts necessary.

ASSEMBLYSee Figures 8 and 9. Follow the disassemblyprocedures in reverse for reassembling the pump.

During assembly, install new seals and O-rings.Apply a thin film of CLEAN grease or hydraulic fluidto sealing components to ease assembly. If a newrotating group is used, lubricate thoroughly withCLEAN hydraulic fluid. Apply fluid generously to allwear surfaces.

SWASHBLOCK GROUP

If removed,

1. Press shaft seal (007) into front of pumphousing.

2. Place housing on a bench with the mountingflange side down.

3. Grease the back side of each saddle bearing(204) and place on the pin to locate thebearings in the pump case. Make sure the pinsdo not protrude.

4. The swashblock is inserted from the valve plateend. Insert swashblock (201) into the pumphousing. Once in place, be sure the swashblockswivels in the saddle bearings. With newbearings, swiveling may be stiff and not alwayssmooth.

5. Bearing (202) should fit into place with a littledifficulty and be square to the axis of the pump.

6. Tap bearing into place if necessary usingextreme care not to damage the bearing.

7. Insert retaining ring (208) to hold bearing inplace. Assemble plug (205) with O-ring (209)into case.

DRIVE SHAFT GROUP

1. Place the housing on its side with the axishorizontal.

2. Install the seal retainer (302).

3. Lubricate the shaft seal (007) and shaft.

4. Insert the drive shaft (301) and bearingassembly into the housing.

5. Lock in place with the drive shaft bearingretainer ring (305).

ROTATING GROUP

See Figure 6.

1. Place the cylinder barrel (101), wear surfacedown, on a clean cloth.

2. Place the shoe retainer spring (105) in thecenter of the barrel with the fulcrum ball (103)on top of it.

3. Insert the identified pistons (102) into theircorresponding identified holes of the shoeretainer (104). As a unit, fit the pistons into theircorresponding, identified bores in the cylinderbarrel. DO NOT FORCE. When parts arealigned properly, the pistons will fit smoothly.


The rotating group weight is heavy. Becareful not to damage cylinder wearsurface which mates against the valveplate, bearing diameters or piston shoes.Use proper lifting techniques andassistance from others to preventpersonal injury.

The rotating group can now be carefully installedover the end of the drive shaft (301) and into thepump housing (001).

When installing the rotating group, supportthe weight of the cylinder barrel (101), ascylinder spline is passed over the tailshaft,to avoid scratching or damage.

4. Push cylinder forward until the cylinder splinereaches the drive shaft spline and rotateslightly to engage shaft splines. Continue toslide cylinder forward until it encounters thecylinder bearing (202). Lifting the rear of theshaft slightly helps the cylinder (101) and thecylinder bearing (202) engagement. Continuepushing the cylinder forward until the pistonshoes contact the swashblock; the back of thecylinder should be located approximately 0.4inches (10,2 mm) outside the back of the pumphousing.

On thru-shaft pumps without another pumpor device connected to them, slideassembly onto the shaft (301) and securecap assembly (307, 309) in with sockethead shoulder screw (308).

VALVE PLATE GROUP

1. Place the pump housing on a bench with theopen end facing up.

2. Install new O-rings (404) and (411) on thehousing.

3. Position the valve plate (401) on pins (005) andhousing. Make sure the end of shaft engagesthe bushing.

4. Hand-tighten cap screw (403) closest to O-ring(404) first, then alternately tighten the other capscrews. On thru-shaft units connected toanother pump or device, install coupling (501).

Refer to PREPARATION and INSTALLATIONwhen pump is ready to be returned to service.

! WARNING

NOTE

NOTE


Table 3. PVG Pump Torques

O-ring SizesARP 568 Uniform Size Number with

Durometer

Table 4. O-ring Sizes

PVG Pump Fastener or PlugHead

Type/Size Tightening Torque

048/065/075

004 5/8 int. 135 ft•lb (183 N•m)205 1/8 int. 45 in•lb (5 N•m)308 3/16 int. 87 in•lb (10 N•m)403 3/8 int. 100 ft•lb (136 N•m)408 1/8 int. 45 in•lb (5 N•m)409 1/8 int. 45 in•lb (5 N•m)410 3/16 int. 120 in•lb (14 N•m)503 Depends on adapter

3/8 SHC 5/16 int. 45 ft•lb (61 N•m)3/8 HHC 9/16 int. 15 ft•lb (20 N•m)1/2 HHC 3/4 ext. 37 ft•lb (50 N•m)

507 5/16 int. 45 ft•lb (61 N•m)

Item Number PVG Pump 048/065/075010 916 - 70209 902 - 90404 012 - 90405 902 - 90406 903 - 90407 904 - 90411 251 - 70505 & 506 Depends on Adapter

505 Cover Plate 138-70505 SAE A 153-70

505 SAE A-A 034-70505 SAE B or B-B 158-70

506 SAE A 042-70506 SAE B or B-B 155-70

PVG -048/-065/-075 B-Frame Pump


PARTS LISTParts used in these assemblies are per Oilgearspecifications. Use only Oilgear parts to ensurecompatibility with assembly requirements. When ordering replacement parts, be sure to includepump type and serial number, bulletin number anditem number. Specify type of hydraulic fluid toassure seal and packing compatibility.

Parts drawings may not be identical toOilgear drawings referenced.

PARTS LIST drawings on pages 24 through 27.

Parts are common between pumps. Only the differences are shown.

NOTE

Item Qty. Description

HOUSING ASSEMBLY GROUP

001 1 Housing, Pump

003 1 Nameplate, Identification

004 1 Plug

005 4 Pin, Roll

007 1 Seal, Shaft

008 2 Screw

009 2 Pin, Swashblock Bearing

010 1 Seal, O-ring

ROTARY ASSEMBLY GROUP

101 1 Barrel, Cylinder

102 9 Assembly, Piston/Shoe

103 1 Ball, Fulcrum

104 1 Retainer, Shoe

105 1 Spring, Shoe Retainer

SWASHBLOCK ASSEMBLY GROUP

201 1 Swashblock

202 1 Bearing, Cylinder

204 2 Bearing, Swashblock

205 1 Plug, Bearing Retainer

208 1 Ring, Retainer

209 1 Seal, O-ring



PARTS LIST drawings on pages 24 through 27.

Parts are common between pumps. Only the differences are shown.

Parts used in this assembly are per Oilgear specifications. Use only Oilgear parts to ensure the compatibility with the assembly requirements. When ordering replacement parts, be sure to include pump type and serial number, bulletin number and item number. To assure seal and packing compatibility, specify type of hydraulic fluid.

Item Qty. DescriptionDRIVE SHAFT ASSEMBLY GROUP

301 1 Drive Shaft302 1 Retainer, Seal Side303 1 Key, Drive Shaft (keyed shafts only)304 1 Ring, Retainer, External305 1 Ring, Retainer, Internal306 1 Bearing, Front307 1 Bushing (used on thru-shaft w/ cover plate)308 1 Screw (used on thru-shaft w/ cover plate)309 1 Roll Pin (used on thru-shaft w/ cover plate)

VALVE PLATE ASSEMBLY GROUP401 1 Valve Plate w/bearing403 4 Screw, Cap404 1 Seal, O-ring405 1 Seal, O-ring406 1 Seal, O-ring (not required for all versions)407 1 Seal, O-ring408 1 Plug, #2 HP409 1 Plug, #3 HP (not required for all versions)410 1 Plug, #4 HP411 1 Seal, O-ring

COUPLING / ADAPTER ASSEMBLY GROUP501 1 Coupling502 1 Adapter or Cover Plate

5032 Screw (for adapters)4 Screw (for cover plate)

504 2 Washer505 1 Seal, O-ring506 1 Seal, O-ring507 4 Screw508 1 Gasket (SAE A-A)



SERVICE KITSPVG B Pump Service Kits

Reference: 517105-200 Ass’y Drwg

Document Number: 517105-SK

Revision: 0 (04-21-09)

Sheet 1 of 4

Description Kit No.Design Series Items Included (quantity is 1 unless noted)

Housing KitsViton Seals L517105-621 F1(B)

001, 003, 004, 005(4), 007, 008(2), 009(2), 010Nitrile Seals L517105-622 F1(B)EPR Seals L517105-623 F1(B)

Shaft & Bearing KitsViton or Nitrile seals

1" Dia. Keyed (Code Y) Std L517104-301 All 301A, 302, 303, 304, 305, 306

13T, 16/32 Spline (Code K) Std L517104-305 All 301B, 302, 304, 305, 30615T, 16/32 Spline (Code S) Std L517104-302 All 301C, 302, 304, 305, 306

1" Dia. Keyed (Code Y) T-S L517104-303 All 301D, 302, 303, 304, 305, 306

13T, 16/32 Spline (Code K) T-S L517104-306 All 301E, 302, 304, 305, 306

15T, 16/32 Spline (Code S) T-S L517104-304 All 301F, 302, 304, 305, 306

EPR Seals

1" Dia. Keyed (Code Y) Std L517104-313 All 301A, 302, 303, 304, 305, 30613T, 16/32 Spline (Code K) Std L517104-315 All 301B, 302, 304, 305, 306

15T, 16/32 Spline (Code S) Std L517104-317 All 301C, 302, 304, 305, 306

1" Dia. Keyed (Code Y) T-S L517104-312 All 301D, 302, 303, 304, 305, 306

13T, 16/32 Spline (Code K) T-S L517104-314 All 301E, 302, 304, 305, 306

15T, 16/32 Spline (Code S) T-S L517104-316 All 301F, 302, 304, 305, 306

Std = Rear ported or Side ported w/o thru-shaft, T-S = Side ported w/ thru-shaft

Swashblock All 516597-250 F1(A) 201

Saddle BearingStandard L517105-220 All

204A, 204BHigh Temp L517105-221 All

Hydrodynamic Bearing KitViton Seals L517105-211 F1(A)

202, 205, 208, 209Nitrile Seals L517105-212 F1(A)

EPR Seals L517105-213 F1(A)

Rotating GroupPVG-048/065 L517104-103 B2(A)

101, 102(9), 103, 104, 105PVG-075 L517105-103 B2(A)

Piston & Shoe Sub-AssemblyPVG-048/065 K407905-R65 B2(A)

102(9)PVG-075 K407905-A75 B2(A)

Shoe Retainer & Fulcrum BallPVG-048/065 L319221-365 All

103, 104PVG-075 L319221-375 All



PVG B Pump Service KitsReference: 517105-200 Ass’y Drwg


Revision: 0 (04-21-09)

Sheet 2 of 4


Valve Plate KitsPVG-048/065 Rear Port LH

401A, 403(4), 404, 405, 406, 407, 408, 409, 410, 411Viton Seals L517104-401 All

Nitrile Seals L517104-411 All

EPR Seals L517104-408 All

PVG-048/065 Rear Port RH

401B, 403(4), 404, 405, 406, 407, 408, 409, 410, 411Viton Seals L517104-402 All



PVG-048/065 Side Port LH

401C, 403(4), 404, 405, 406, 407, 408, 409, 410, 411Viton Seals L517104-405 All

Nitrile Seals L517104-414 AllEPR Seals L517104-415 All

PVG-048/065 Side Port RH

401D, 403(4), 404, 405, 406, 407, 408, 409, 410, 411Viton Seals L517104-406 All



PVG-048/065 Side Port, Thru-Shaft LH

401E, 403(4), 404, 405(2), 407(2), 408(2), 410(2), 411Viton Seals L517104-403 All



PVG-048/065 Side Port, Thru-Shaft RH

401F, 403(4), 404, 405(2), 406, 407, 408(2), 409, 410, 411Viton Seals L517104-404 All


PVG-075 Rear Port LH

401A, 403(4), 404, 405, 406, 407, 408, 409, 410, 411Viton Seals L517105-401 All



PVG-075 Rear Port RH

401B, 403(4), 404, 405, 406, 407, 408, 409, 410, 411Viton Seals L517105-402 All



PVG-075 Side Port LH

401C, 403(4), 404, 405, 406, 407, 408, 409, 410, 411Viton Seals L517105-405 All


PVG-075 Side Port RH

401D, 403(4), 404, 405, 406, 407, 408, 409, 410, 411Viton Seals L517105-406 All



PVG-075 Side Port, Thru-Shaft LH

401E, 403(4), 404, 405(2), 407(2), 408(2), 410(2), 411Viton Seals L517105-403 AllNitrile Seals L517105-409 All


PVG-075 Side Port, Thru-Shaft RH

401F, 403(4), 404, 405(2), 406, 407, 408(2), 409, 410, 411Viton Seals L517105-404 All







Revision: 0 (04-21-09)

Sheet 3 of 4


Basic Seal KitViton Seals K517105-B11 All

007, 010, 209, 404, 405(2), 406, 407(2), 411 Control 313, 330

Nitrile Seals K517105-B12 All

EPR Seals K517105-B13 All

Seal Kits for OptionsStandard Cover Plate

505Viton Seals 238270-138 All

Nitrile Seals 233370-138 All

EPR Seals 242080-138 All

SAE B Adapter

505, 506Viton Seals L250667-017 AllNitrile Seals L250667-016 All


SAE A Adapter

505, 506Viton Seals L250667-014 All


EPR Seals L250667-015 AllSAE A-A Adapter

505, 508Viton Seals L250667-019 All



Shaft SealViton Seals 51155-5 All

007Nitrile Seals 51155-7 All

EPR Seals L51155-3RP All





Revision: 0 (04-21-09)

Sheet 4 of 4


Cover Plate KitViton Seals L319076-101 All

307, 308, 309, 502, 503(4), 505Nitrile Seals L319076-105 All


Rear Shaft Cover KitAll L319263 All 307, 308, 309

SAE B Adapter/Coupling KitViton Seals L319076-100 All

501, 502, 503(2), 504(2), 505, 506Nitrile Seals L319076-107 All


SAE A Adapter/Coupling Kit 9 toothViton Seals L319076-103 All

501, 502, 503(2), 504(2), 505, 506, 507(4)Nitrile Seals L319076-109 All


SAE A Adapter/Coupling Kit 11 toothViton Seals L319076-106 All

501, 502, 503(2), 504(2), 505, 506, 507(4)Nitrile Seals L319076-111 All


SAE A-A Adapter/Coupling KitViton Seals L319076-104 All

501, 502, 503(2), 504(2), 505, 507(4), 508Nitrile Seals L319076-113 All


Name Tag & ScrewsAll L50921 All 003, 008(2)Footnotes for Design Series(A) Swashblock and Rotating group/piston and shoe assembly must have matching design series A1 and B1 parts can be intermixed between series B2 Swashblock must be used with B2 design series parts F1 Swashblock must be used with F1 design series parts B2 and F1 Rotating group/piston and shoe assembly interchangeable with B2 and F1 design series(B) F1 Pump case and Hydro bearing are not interchangeable with previous design series F1 Pump requires F1 Control Pump cases are interchangeable prior to F1 A1 series has #12 SAE threaded case drain connection B1 and B2 series have #16 SAE threaded case drain connection



Figure 8. Cross Section and Exploded Parts Drawing for PVG 048, 065 and 075 (517105-200 sheet 1 of 7)

306

301 30

4

305

302

005

404

403

401

008

003

007

009

005

201

208

102

001

411

009

204B

202

104

103

105

101

204A

406

407

408

409

405

410

004

010

205

209

OIL

G04

53



Figure 9. Exploded Parts Drawing for PVG 048, 065 and 075 (517105-200 sheet 2 of 7)

301A

303

403

403

409

410

405

401C

405

406

407

401A

411

201

204A

204B

005

008

003

004

009

001

005

202

208

102

104

103

105

101

304

305

306

302

007

205

407

408

407

505

405

502

503

401E

403

309

308

307

301E

301D

301C

404

301B

209

010

409

410

410

401F

410

401B

408

406

407

401D

408

301F

OIL

G04

54



Figure 10. Cross Section Drawing for PVG 048, 065 and 075 (517105-200 sheet 6 of 7)

SA

E B

TO

SA

E A

-A (S

HO

WN

)(S

EE S

HEET

2 F

OR

EXPL

OSI

ON)

OR

SA

E B

TO

SA

E B

(S

HO

WN

)S

AE

B T

O S

AE

B-B

CO

VE

R P

LAT

E A

SS

EM

BLY

SA

E B

TO

SA

E A

OIL

G04

55

401E

401F

401E

401F

502

503

502

507

503

504

506

501

505

307

309

505

308

508

401E

401F

505 50

2

506

501

503

504

THR

U-S

HA

FT O

PTI

ON

S



Figure 11. Cross Section and Exploded Parts Drawing for PVG 048, 065 and 075

(517105-200 sheets 6 and 7 of 7)

OIL

G04

56

SA

E B

TO

SA

E A

-A (S

HO

WN

)

SA

E B

TO

SA

E B

(S

HO

WN

)S

AE

B T

O S

AE

B-B

THR

U-S

HA

FT O

PTI

ON

S

SA

E B

TO

SA

E A

OR

301D

301E

301F

301G

301H

401E

401F

505

502

501

507

508

506

504

503

301D

301E

401E

401F

301F

301G

301H

501

505

502

506

504

306

503

301G

301H

SA

E C

TH

RU

-SH

AFT

AS

SE

MB

LY

310

303

304

305

302



AFTER SALES SERVICESAt Oilgear we build products to last. It is the natureof this type of machinery to require propermaintenance regardless of the care we put intomanufacturing. Oilgear has several serviceprograms in place to help you.

STAY-ON-STREAM SERVICE

By signing up for Oilgear's Stay-On-Streamprogram, you can prepare for problems before theyhappen. Certain field tests such as fluid testing,slip testing and electronic profile recordingcomparisons can be performed by our field servicepeople or your own factory trained personnel.These tests can indicate problems before theybecome “down-time” difficulties.

SERVICE SCHOOLS

Oilgear conducts training to train your maintenancepersonnel. “General” hydraulic or electronictraining is conducted at our Milwaukee, Wisconsinplant on a regular basis. “Custom” training,specifically addressing your particular hydraulicand electro-hydraulic equipment can be conductedat your facilities.

SPARE PARTS AVAILABILITY

Prepare for your future needs by stocking Oilgearoriginal factory parts. Having the correct parts andnecessary skills “in-plant” enables you to minimize“down-time.” Oilgear has developed parts kits tocover likely future needs. Oilgear Field ServiceTechnicians are also ready to assist you and yourmaintenance people in troubleshooting andrepairing equipment.

Issued: November 2009

THE OILGEAR COMPANY2300 South 51st Street

Milwaukee, Wisconsin 53219www.oilgear.com

oilgear type “pvg” pumps - -048/-065/-075 (series...

Documents