ht7_eng

DISC FLOOR SANDER MODEL HT7-2

OWNERS MANUAL & OPERATING INSTRUCTIONS

��

PRIN

TED

INTH

EU

K

� ��

��

��

NORTH AMERICAN SAFETY INSTRUCTIONS

USE AND APPLICATION

WARNING: This floor sanding machine must be grounded.

This floor-sanding machine shall be grounded while in use to protect the operator from electricshock. The machine is provided with a three-conductor cord and a moulded three-contactgrounding type attachment plug to fit the proper grounding type receptacle. The Green (orGreen and Yellow) conductor in the cord is the grounding wire. Never connect this wire to otherthan the grounding pin of the attachment plug.

This floor-sanding machine is provided with an attachment plug as shown in sketch A. It isintended for use on a nominal 120 volt circuit. If a properly grounded receptacle as shown insketch A is not available, an adaptor as shown in sketch 'C' should be installed as shown in sketchB if the outlet box that houses the receptacle is grounded. Be sure to fasten the grounding tab witha metal faceplate screw.

Floor sanding can result in an explosive mixture of fine dust and air. Use floor-sanding machineonly in a well-ventilated area free from any flame or match.

Moving Parts - to reduce the risk of injury, unplug the machine before replacing abrasive sheetsor carrying out any form of adjustment or servicing.

WARNING:

WARNING:

Risk of explosion.

Of potential injury.

This machine is intended for commercial use connected with the laying and maintaining of wooden floors anddecks.

These types of surfaces may be found both in commercial and household environments.

ATTACHMENT PLUG SKETCH ‘C’

METALSCREW

COVER OF GROUNDEDOUTLET BOX SKETCH ‘B’

ADAPTER

GROUNDINGMEANSCOVER OF GROUNDED

OUTLET BOX SKETCH ‘A’

GROUNDING PIN

CONTENTS

WARNING

MAINS CABLE WIRING - PLUG

SPARE PARTS

SPECIFICATION

SAFETY

SET UP

PREPARATION

OPERATION

FLOOR SANDING TECHNIQUE

FLOOR TYPES

i

i

I

1

1

Assembly and Transport 2Installing Abrasive Disc 2

2

2,3

Drum Floor Sander 4Disc Floor Sander 4Orbital Floor Sander 4Hand Sanding 4

Sanding Plank & Strip Floors 4Veneered, Laminated & Thinner Floors 4

Parquet & Block Floors 5Between Coats of Finish (Varnish) 5

6

General 7Visual Inspection 7Dust Control System 7Drive 7Lubrication 7Care of Motor 7,8Sanding Pad Removal & Replacement 8Sanding Pad Trimming 9Adjsuting the Castors 10Electrical Testing 10

11

12

13

14

15

ABRASIVE PAPER GUIDE

SERVICE AND ROUTINE MAINTENANCE

FAULT FINDING

HT7-2 PARTS DRAWING

HT7-2 PARTS LIST

HT7-2 CIRCUIT DIAGRAM

DECLARATION OF CONFORMITY

SERVICE & REPAIR 16

WARNING

MAINS CABLE WIRING - PLUG

For safe operation of this machine, read and understand all instructions. Look for the ‘warning/caution’ symbol.

This symbol means that if you do not follow the instructions injury can occur to the operator anddamage to the machine and floor may result.

Hiretech reserves the right to make changes or improvements to it's products without prior notice.�

i

NORTH AMERICA

BLACK

WHITE

GREEN

BRASSTERMINAL

SILVERTERMINAL

EU

BLUE BROWN

GREEN/YELLOW

UNITED KINGDOM

BLUE(N - NEUTRAL)

BROWN(L - LINE)

GREEN/YELLOW(E - EARTH)

SPARE PARTS

Use Hiretech genuine spare parts only for service and repair. Use of non-approved parts will void the productwarranty. See the back cover of this manual for the terms and conditions of the Hiretech Limited Warranty.

SPECIFICATION

The HT7-2 Hiretech Edger (Disc Floor Sander) willsand hard and soft wood floors, cork andcomposition floors and any solid wood surface thatrequires rapid sanding and leveling to a fine finish.Ideal for confined areas such as closets and stairtreads the HT7-2 will sand right up to the edge of afloor without damage to the base (skirting) board.Completely self contained with a high efficiency dustpick-up the HT7-2 is a high performance sandersuitable for professional and home owner use.

SAFETY

1. For safety it is recommended that a residualcurrent circuit breaker (ground fault interrupter)is used with this machine.

2. Check the operating voltage is correct and thatthe machine is switched OFF (O) beforeconnecting to the power supply.

3. Never attempt to lock the switch in the ON (I)position with tape or by any other means.

4. Always disconnect from the power supply whenchanging the abrasive disc, servicing the floorsander, replacing the dust bag or leaving themachine unattended.

5. Always replace the dust bag (paper type) orempty the dust bag (cloth type) when the dust inthe bag reaches the ‘MAX’ line or when themachine is left unattended.

6. Never dispose of or empty the contents of thedust bag into a fire or incinerator.

7. Never reuse the paper dust bag or use a nonstandard bag. Cloth type bags must be in goodcondition with no holes.

8. Always wear a dust mask when using the floorsander, handling the dust bag or cleaning themachine after use.

9. Wear ear protection when using the floor sander.

10. Ensure adequate ventilation of the work area toavoid the formation of a combustible mixture offlying dust and air.

11. Never smoke when using or servicing the floorsander or when handling the dust bag.

12. Never expose the machine to rain or damp.Always store in a dry place.

13. Stop the floor sander immediately if damage tothe machine or abrasive disc is suspected.

14. Never allow the power cable to come into contactwith the sanding disc when the floor sander is inoperation. If the power cable becomes damagedand the inner conductors are exposed switch thepower OFF and remove the plug beforeattempting to move the machine. The cable mustbe replaced by an authorised agent or qualifiedelectrician using genuine Hiretech spare partsonly.

15. Keep hands, feet and loose clothing away fromall moving parts of the machine.

16. Punch down or remove all nails, screws, tacksand other fixings from the floor before sanding toprevent contact with the sanding disc.

17. Never use the machine above waist height ascontrol will be lost.

18. Keep children and pets clear at all times.

19. If the machine should fail to operate refer to thefault finding guide on page 8.

1

CAUTION - read the following Safetyand Operational notes before using yourHT7-2 Disc Floor Sander.

Noise: 100 dBa at 1metre (3’ 3")

Switch: Bias Off, double pole.

Motor RPM: 13,000

Disc RPM: 3,000

Moving Parts: Sealed for life ball bearings.

Weight: 16.4kg (36.2lbs)

0.04 M² H Aeq8

(8 Hr. RMS )

7" (178") dia. x 7/8“ (22mm) dia.

centre hole. 24 to 120 grit fibre or

paper back.

Abrasive:

Continuous heavy duty AC/DC self

cooling 4 brush.

7" (178mm) dia. Metal backed and

rubber bonded.

High impact ABS with bronze bush.

Hardened steel alloy pinion and

large diameter aluminium bronze

drive gear.

Seated oversize vacuum fan,

disposable paper dust or cloth

bag.bags

Disc Guard:

Drive:

110/120 V 50/60 Hz

220/240 V 50/60 Hz

110/120 V 8A

220/250 V 5A

Average

Load Current:

110/120 V 15A

220/250 V 8A

Dust Pickup:

Vibration:

Power Supply:

Off Load

Current:

Motor:

Sanding Pad:

SET UP

Assembly and Transport

Installing Abrasive Disc

1. Always carry the floor sander by the two handleswith the bag frame in the up position and thepower cable stowed around the bag frame.Protect the sanding disc with an abrasive discand ensure that the clamp bolt is secure. Ensurethat the floor sander is secure and cannot movewhen being transported in a vehicle. The floorsander is heavy. Take care when lifting andcarrying the machine.

2. To prepare the floor sander for use place themachine on the floor and remove the cable fromthe bag frame. Check that the cable is in goodcondition and that all fittings are secure.

3. Lower the dust bag support frame and fit a paperdust bag following the instructions printed on thebag. Do not reuse or use a non standard bag. If acloth type bag is used ensure that it is tied securelyaround the dust outlet and that the bag is in goodcondition with no holes.

4. To dismantle the floor sander reverse procedure2 to 3 above.

1. Ensure the power cable is disconnected from thepower supply.

2. Tip the floor sander upside down and rest themachine on it's top and handles.

3. Remove the Wrench Ref.61 from the clips insidethe skirt of the floor sander situated in betweenthe castors and remove the Bolt Clamp Ref.59and Washer Clamp Ref.58 from the centre of thesanding disc.

4. Select a suitable grade of abrasive disc (seeAbrasive Paper Guide on page 5).

5. Place the bolt clamp through the centre of thewasher clamp and abrasive disc and carefullythread the bolt into the sanding disc.

6. Using the wrench, tighten the bolt clampensuring that the abrasive disc is centred and thewasher clamp is properly located. The boltshould be secure but do not try to over tighten.Heavy grit abrasive discs will seat down as youtighten the bolt so take care to ensure the washer

CAUTION - never fit more than oneabrasive disc . If more than one abrasivedisc is fitted the setup of the sander willbe affected and the clamp bolt andwasher and sanding pad will bedamaged.

clamp is properly located. Heavy grit abrasivediscs may not lie flat on the sanding disc, this isquite normal and the abrasive disc will flattenimmediately upon operation.

7. Do not use damaged or incorrectly sizedabrasive discs under any circumstance, damagewill result to the machine and floor.

1. Where possible remove all furniture from thearea or room. The HT7-2 Disc Floor Sanderfeatures an efficient dust pickup, however, somedust will escape. Protect all vulnerablefurnishings with dust sheets.

2. Remove all tacks, staples and other unwantedfixings from the floor. Failure to do so will resultin damage to the abrasive disc and sanding disc.

3. Punch all nails below the surface of the floorusing a suitable nail punch and hammer. Anyscrews used to fix boards should be counter sunkbelow the surface. During sanding, any nails orscrews that become exposed must be punched orcounter sunk further.

4. Firmly fix all loose boards or blocks.

5. Remove heavy wax, grease and dirt deposits byhand.

6. Sweep and vacuum the floor thoroughly toremove dirt and discarded fixings.

7. Ensure good ventilation by opening windows.

8. If sanding a work bench or similar work piecefollow the instructions above to prepare it readyfor sanding. Make sure that the work piece issecure. Never use the floor sander above waistheight.

Note: Use Hiretechgenuine floor sander abrasives forthe best sanding performance and finish.

1. Move the floor sander to the location of yourwork.

2. Make sure the switch is in the OFF (O) positionthen connect the power cable to a suitable powersupply ideally located behind or to one side ofthe machine and work area.

3. Wear a dust mask and ear defenders.

4. Kneel behind the machine on one knee (use kneepads to protect knees) and hold both handleswith the power cable held in the right hand in asmall loop and then pass the cable over the rightshoulder. Tilt the floor sander back so that the

PREPARATION

OPERATION

2

sanding disc does not touch the floor or workpiece.

5. Switch ON by pushing the ON/OFF switch to (I)position and hold in place with your thumb. Toswitch OFF (O), release the pressure on theswitch and it will automatically return to the OFFposition.

6. Now lower the floor sander slowly forward sothat the abrasive disc comes into contact with thefloor or work piece. At the same time move themachine in a sideways motion so when theabrasive disc comes into contact with the worksurface it is moving to one side. This will ensurethat the sander does not dwell in one positionand damage the floor or work piece.

i. Always ensure that the floor sander ismoving when in operation and thesanding disc is in contact with the floor.

ii. Never lift the back of the machine whensanding.

iii. Never apply pressure to try to increase therate of sanding. Damage to the floor orwork piece will occur.

iv. Never bounce or drop the floor sander onto the floor or work piece, always lower themachine gently.

v. Never dwell in one place, move steadily atall times.

vi. Never allow the power cable to come intocontact with the sanding disc.

7. When the dust in the dust bag reaches the ‘MAX’line stop sanding. Switch OFF (O) anddisconnect the power cable from the powersupply and remove the paper dust bag. Turn thetop of the paper dust bag over to stop the escapeof dust and dispose of into a suitable container.

Never reuse the paper dust bag or empty it.Never dispose of it into a fire. If the cloth bag isused empty into a suitable container beingcareful to contain the dust. Do not dispose of thecontents into a fire.

8. Fit a new paper dust bag, or refit the cloth bag.Reconnect the floor sander to the power supplyand continue sanding.

CAUTION - the HT7-2 Disc Floor Sanderis a powerful machine. Always ensureyou have a firm grip before switching on.

CAUTION - to prevent damage to thefloor surface, work piece or machinefollow these rules.

3

9. When taking a break from work switch OFF ‘O’and disconnect the power cable from the supply,remove and dispose of the paper dust bag, orempty the cloth bag as detailed in 7. above.Never leave the floor sander unattended with adust bag in place containing dust.

10. On completion disconnect the power cable fromthe supply. Remove and dispose of the paperdust bag, or empty the cloth bag as detailed in 7.above. Replace the bag frame in its up positionand stow the power cable. Leave the old abrasivedisc inplace to protect the sanding disc. Carry outmaintenance as recommended in Maintenanceand Servicing.

DANGER - never leave the floor sanderunattended with dust in the dust bag.Always remove the dust bag and disposeof into a suitable container.


HT8-1.2 Floor Sander (Drum)

HT7-2 Disc Floor Sander (Edger)

HTF-2 Floor Sander (Orbital)

Hand Sanding

- a powerful floorsander designed for the rapid leveling and sanding ofall types of wood flooring excluding thin laminated orveneered floors. Load the sander with abrasivemaking sure that it is skin tight around the drum.Loose sheets will tear. Place the sander on the righthand wall (unless you are making an angled cut onuneven floors) with about two thirds of the floor infront of you. Start the sander with the drum off thefloor then walk forward at an even pace and ease thedrum on to the floor. As you near the end of the pass,gradually raise the drum off the floor. Practice thistechnique before turning on the sander.

Cover the same path you made on the forward cut bypulling the machine backwards and easing the drumto the floor as you begin the backward pass until youreach the original starting point, then ease the drumoff the floor.

When two thirds of the floor is sanded, turn the floorsander around and sand the remaining third in thesame way. Overlap the one third area by 0.6 to 0.9meters (2 to 3 feet ) with the two thirds area to blendthe two areas together.

- a powerful discfloor sander designed for sanding along the edges ofa floor without damaging the baseboards ormoldings. Also suitable for smaller areas where theHT8-1.2 Floor Sander will not reach like stair treadsand closets load the abrasive disc making sure theretaining bolt is tight. Start the edger with the disc offthe floor then lower the disc to the floor as you movethe sander. Work progressively moving the sander ina sweeping motion from side to side.

- a orbital action floorsander designed for re-finishing, sanding betweencoats of varnish and re-surfacing floors in goodcondition. load the abrasive sheet, pad or strip. Startthe sander, move immediately and sand in thedirection of the grain using the same technique as thedrum floor sander. For difficult to reach areas use thedisc floor sander with a fine grit abrasive, or sand byhand.

- to sand difficult to reach areasscrape and sand the floor by hand. Use a scraper toremove old finishes, always scraping in the directionof the grain, and then sand by hand using the samegrit abrasive as you finished with when machinesanding. See Floor Sanding Technique diagrams onpage 5.

WARNING - never bounce the sandingdrum or dwell in one place as this willsand dips and hollows in the floor.

FLOOR TYPES

PLANK & STRIP FLOORS

VENEERED, LAMINATED & THINNER FLOORS

Old floors in good condition

Uneven floors

Floors with an existing finish

Hiretech

- when the floor is ingood condition - no uneven edges, cupping orcrowning of planks and strips - and you want to re-surface the floor, sanding back to new wood, startsanding in the direction of the planks or strips - withthe wood grain. Start with a medium grit abrasive.Complete the first cut with the HT8-1.2 Floor Sanderthen sand up to the baseboards and door thresholdswith the HT7-2 Disc Floor Sander, using a mediumgrit abrasive, blending the edges in with the mainfloor area. Sweep the floor. Using a medium/fine gritabrasive, sand the main floor area with the drumsander and then complete the floor with the edgerusing a fine grit abrasive. Sweep the floor. Finishsanding the main floor area with the drum floorsander using a fine grit abrasive. If the floor is inparticularly good condition (level with no deepscratches or blemishes) you may re-surface the floorusing the HTF-2 Floor Sander, however, as thesanding action of this machine is less aggressive thanthe HT81.2 Floor Sander the job will take more time.

- when the floor is uneven sand

diagonally at 45 across the room in both directionsusing the HT8-1.2 Floor Sander with a coarse gritabrasive. Only make one cut on both diagonals, thiswill achieve a basic level. Now complete the floor asfor a level strip or plank floor. Use the same gritabrasive as was used on the 45 cut for the first cutparallel to the planks or strips.

- when re-finishing afloor remove as little of the existing surface aspossible. If the old finish is worn and the floor isgenerally in good condition use the HTF-2 FloorSander with abrasive pads and strips whichhave been especially designed for re-finishing floors.These will maintain the integrity of any stain used tocolour the wood and prepare the surface for a newcoat of finish. If the floor is badly marked andscratched and has to be sanded back to new wooduse the HT8-1.2 Floor Sander and HT7-2 Disc FloorSander. Always try a medium grit paper first,particularly on a diagonal cut. If 90% of the old finishis removed and the floor is generally leveled, you donot need to use a coarse grit abrasive.

Use the HTF-2 Floor Sander for veneered andlaminated floors or thinner floors that may have beensubjected to repeated sanding. The HTF-2 willremove old surface finishes and prepare the floor forre-finishing. Sand the floor using the same methodas a strip, plank, or parquet floor. If the floor hasdeeper scratches or marks these should be sanded

�

�

4

out by hand and blended in with the main floor. Tocheck the wood depth in the floor remove abaseboard or molding from around the edge of thefloor. This should provide access to the edge of thefloor for inspection.

The grain of the wood will run in a number ofdirections so sand the floor in the direction of themain source of natural light in the room. If there is nosource of natural light sand in the direction of thelongest side of the room or, if the room is square, inthe direction the furniture is laid out and how peoplenormally use and view the room.

This technique will help mask any imperfections in the

PARQUET & BLOCK FLOORS

floor. Complete the sanding operation as detailedfor plank or strip floors.

Use the HTF-2 Floor Sander to sand between coats offloor finish, particularly when using water basedvarnishes. These types of finishes tend to raise thewood grain when first applied to raw wood. Alloweach coat of varnish to dry completely following themanufactures directions. Use Hiretech abrasive padsto sand between each coat of varnish. The fineabrasive pads will remove light brush/applicatormarks and raised grain while maintaining theintegrity of the coat of varnish applied.

BETWEEN COATS OF FINISH (VARNISH)

unsanded boardssanded boards

level very unevenfloors by sandingdiagonally in both

directions

unsanded boards

unsanded boards

Level uneven floors.

Sand main floor area.

Sand and blend edges in with main floor area.


Plank and Strip Floors

Parquet and Wood Block Floor

- sand in thedirection the boards are laid, with thewood grain.

-sand in the direction of the mainsource of natural light. If there is nonatural source of light, sand in thedirection of the longest side of theroom. If the room is square, sand inthe direction the furniture is laid outand how people normally use theroom.

s

5

HTF-2 FLOOR SANDER ABRASIVE GUIDE

6

HT8 FLOOR SANDER & HT7 DISC FLOOR SANDER (EDGER)

Grit 24

Grit 40/50

Abrasive Paper Grade Floor Type and Condition

Grit 24 Open Coat

Grit 40 Open Coat

Grit 80

Grit 100

Grit 120

For removing surface coatings from old floors such as varnish, stains andwax polishes. For the rapid sanding and removal of scratches and marks.Sanding level the joints of sub-flooring like particle board and masonite.

For removing surface coatings from old floors such as varnish, stains andwax polishes. For the rapid sanding and removal of scratches and lightmarks. Sanding level the joints of sub-flooring like particle board andmasonite.

For first sanding of new level wood floors. First sanding after sanding(Medium) with a drum sander.

Intermediate sanding of all types of wood floor.(Medium/Fine)

For final sanding of all types of wood floor. First sanding of cork or(Fine) composition floors. For sanding between coats of solvent based and 2 pack

varnishes.

(Coarse non-clogging)

For the rapid sanding and removal of scratches and marks. Sanding(Coarse) level the joints of sub-flooring like particle board and masonite.

(Coarse/Medium)

For the rapid sanding and removal of scratches and light marks. Sanding(Coarse/Medium) level the joints of sub-flooring like particle board and masonite.

DO NOT OVER-SAND USE ONLY AS HEAVY GRADE ABRASIVE AS IT TAKES TO DO THE

JOB. PROGRESS FROM FIRST GRADE USED THROUGH FOLLOWING GRADES TO

REMOVE ALL VISIBLE SANDING MARKS. DO NOT MISS A GRADE.

FLOOR SANDER ABRASIVES

��

��

��

��

��

��

��

��

��

�� !

HT8/DU8FLOOR SANDER

SHEET50/CASE

HT7/SUPER 7EDGER DISC

FIBRE BACKED25/CASE

HT7/SUPER 7EDGER DISC

PAPER BACKED25/CASE

HTFFLOOR SANDER

SHEETADHESIVE BACKED

50/CASE

HTFABRASIVE PAD

20/CASE

��

Hiretech recommend the followingabrasive range which are suitablefor all floor types and applications.

SERVICE & ROUTINE MAINTENANCE

CAUTION - maintenance and repairsmust be carried out by authorisedpersonnel only. To prevent injury, alwaysremove the power cable from the powersupply before undertaking any work onthe machine. Do not operate thismachine unless it is fully assembled andall guards are in place. Use Hiretechgenuine spare parts only.

General

Visual Inspection

1. Always make a list when first examining themachine, to remind you of parts or actionneeded on completion of repair/service.

2. The HT7-2 is subject to high speeds. All screwsshould be fitted using a suitable thread lockcompound.

3. On completion of any work or service on anelectrical tool or appliance statutory safety testsmust be carried out by a competent person andrecorded (see Testing for Electrical Safety page 7and 8).

4. The HT7-2 needs no lubrication during routineservicing.

5. Always ensure that the electrical supply isdisconnected before starting any routineservicing or repair.

1. To clean the machine and remove dust, use avacuum cleaner to avoid damage and preventinhalation of dust.

2. Examine all guards and mechanical parts forcondition including the Disc Guard Ref.54 whichshould be undamaged and moving freely.

3. Examine the sanding pad, a worn or damagedpad must be replaced to maintain performanceand to avoid injury. There must be a minimum of4mm ( / “) ‘tread depth’.

4. Examine the power cable for damage. If theouter insulation shows the slightest of abrasionsor the inner conductors are exposed then thecable must be replaced. The cable must not berepaired with tape or insulation sleeve.

5. Ensure all labels are sound, readable andsecure.

6. Check that the castors are sound and movingfreely. If a castor is found to be loose or damagedthen the ‘cutting’ angle must be checked andreset as necessary (see Setting Castors page 9).Replace damaged castors.

�

��

7. Check the condition of the Bolt-Clamp Ref.59and clean the threads.

8. Check that the Wrench Ref.61 is in place and ingood condition.

9. If a cloth type bag is in service check thecondition, clogged dust bags or bags with holesmake for inefficient dust pickup.

1. Turn the sander upside down and rest themachine on the handles. Check the dust skirt forpieces of abrasive disc and build up of dust.Clean as needed.

1. The dive gear does not require maintenanceunder normal operating conditions.

1. The HT7-2 features sealed for life bearings whichdo not require any lubrication. In the unlikelyevent that a bearing has to be replaced use aHiretech genuine spare part only as the greasecontained in the bearings is special. A standardbearing is not suitable and may result in furtherdamage.

2. Should the gearbox require service the gearhousing and gears must be cleaned thoroughlyand the gearbox refilled with grease Part No.011270. This is a special grease designed forthe high speed and temperatures generatedwithin the gear box. Under no circumastncemust a standard automotive grease be used.Using such a grease will result in gear failure anddamage to the motor and other components.The grease may also melt and leak from the gearbox staining the floor or work piece beingsanded.

1. The motor must be kept clean and free fromgrease and dust.

2. The motor brushes must be checked regularly.As it is necessary to remove the Cover MotorRef.4 during routine electrical testing, it is then asimple matter to check the condition of the motorbrushes and avoid costly breakdowns.

3. Replace ALL FOUR motor brushes when any onebrush has worn to or less in length.

Brushes MUST slide freely in the brush holders.

There is no need to remove or disconnect anyinternal leads when changing the brushes, onlythe small braided shunt (pigtail) is disconnectedto release the brush.

Dust Control

Drive

Lubrication

Care of Motor

12mm ( / ”)��

��

7

4. To replace the motor Brushes Ref.12.

i. Remove the four Screws Ref.1 from theCover Motor and lift the cover off.

ii. Remove the four Spring Brush Ref.17 andset to one side. The springs are removed bypushing the spring tag in towards thebrush and lifting out.

iii. Using a cross recess screwdriver removethe four brush shunt (pigtail) retainingscrews and lock washers Ref.16.

iv. Remove the four brushes.

v. Thoroughly clean the brush assembly andhousing using a soft brush and a suitablevacuum cleaner.

vi. Inspect the four brushes for damage orwear and if any one brush is found to bedamaged or worn to a length of/ “(16mm) or less then replace all four

brushes. Always replace all four brushestogether.

vii. When replacing brushes ensure that eachbrush moves freely in each holder and fitthe brush with the shunt (pigtail) in such aposition as to allow free movementthroughout the brush life. Ensure thateach brush shunt is connected securelywith the Screw and Washer Ref.16. (twospare screws and washers are providedwith each pack of brushes). The brushshould be fitted so that the brush shunt(pigtail) is at the bottom of the brush.

viii. Refit the brush springs by inserting into theholder with the coil spring over the brushthen push in until the tag comes intocontact with the holder, slide the tag awayfrom the brush and release. The brushspring will clip into position. Check thesprings and brushes for correct alignmentand free movement.

ix. Carry out electrical safety test and recordresults (see Testing for Electrical Safetypage 7 and 8).

x. Finally check that all leads and cables areclear of moving parts and will not betrapped when refitting the cover motor.

xi. Refit the cover motor and secure with thefour Screws Ref.1.

�

�

Sanding Pad

Reasons for Removing/Replacing the Sanding Pad

Removal and Replacement of the Sanding Pad

It is very important to maintain the HT7-2 Edgersanding pad in perfect condition for score freesanding and to maximise the life of the abrasive disc.

In normal operation the sanding pad needs littlemaintenance apart from periodic trimming, however,if the pad is worn below its minimum thickness or it isdamaged it must be replaced.

1. The sanding pad is worn below its minimumtread thickness of 4mm ( / ”)

2. Physical damage that cannot be removed bytrimming.

3. To gain access to maintain/repair the fan, gears,motor and bearings.

4. To remove an obstruction from the dust pickup.

1. Disconnect the edger from the power supply.

2. Turn the edger upside down and rest it on itshandles.

3. Remove the Bolt Clamp (Ref.59) and ClampWasher (Ref.58).

4. Using a 18mm (11/16“) hardwood dowelapproximately 150mm (6") long, lock the FanIntake (Ref.31) in position to stop it turning byinserting the dowel through the underside of theedger to the rear of the sanding pad.

5. Using service tool Part No.011730 Sanding PadWrench, remove the sanding pad in a counterclockwise direction (right hand thread). Take careto support the edger.

Note: The sanding pad can be tight, if needed use asoft mallet to tap the wrench to help removal.

6. Thoroughly clean the Guard Disc (Ref.54) andrefit all the Shims (Ref. 56) if removed.

7. Fit a new sanding pad and tighten using theservice tool.

�

��

CAUTION - when the sanding padbecomes loose carefully remove it byhand. Take care not to lose the Shims(Ref.56) which may come away with thesanding pad. These shims, which mayvary in quantity with a minimum of two,are used on the Shaft Drive (Ref.47) topack out the sanding pad.

8

9

3. To trim the sanding pad fix a piece of fine gritfloor sander abrasive (120 grit) face up to a solidflat board that is large enough to stand on andoperate the edger. Place the board on a flat evenfloor and the edger on top of the board with thepad over the abrasive. Do not fit an abrasivedisc.

CAUTION - make sure that the ClampBolt (Ref.59) is secure and properlytightened

4. Connect the edger to the power supply, stand onthe board and tip the edger back and switch'ON'. Carefully lower the edger so that thesanding pad comes into contact with theabrasive. Move the edger from side to side acrossthe abrasive under its own weight for a fewseconds. Tip the edger back and switch 'OFF’

5. Disconnect from the power supply and check thecondition of the sanding pad. You should witnessan even surface with no high or low spots aroundthe whole surface of the sanding pad in thecontact area as shown in the diagram below.

Note: Do not hold the edger in place, always keep itmoving across the abrasive sheet. Do not over trimthe sanding pad or you will reduce it's life. Do not liftor force the edger while trimming the pad, allow theedger to move under it's own weight. The sanding padminimum tread depth is 4mm ( 5/32“) .

Reasons for Trimming the Sanding Pad

Trimming the Sanding Pad

1. As part of routine maintenance.

2. The sanding pad has been damaged.

3. The sanding pad has been replaced.

4. The sanding pad has been removed to gainaccess to other components or to remove anobstruction from the dust pick-up.

5. The castors have been replaced and/oradjusted.

1. Disconnect the edger from the electrical supplyand place the edger on a flat, smooth surfacesuch as a work bench. Visually check to see thatonly the front of the sanding pad is in contactwith the surface it is standing on. That is, thecastors are adjusted so that the edger is ‘tipped’forward.

2. Use a piece of paper or 0.005" feeler gauge tocheck under and around the sanding pad toconfirm that only the front part of the sandingpad is in contact with the surface it is standingon.

The correct contact area is illustrated in thediagram below.

If the contact area is wrong or can not beidentified accurately check and adjust thecastors as detailed below in - Adjusting theCastor

CONTACT AREA

Sanding Pad Static Contact Area

Sanding Pad Trimmed Contact Area

Adjusting the Castors

The castors are set to achieve the correct contactarea across the sanding pad as illustrated in thediagrams above.

1. To check the castor setting place a clean sheet ofglass across the two castors and the sandingpad. Inserting a 0.005" feeler gauge (or a sheetof paper) between the glass and the sandingpad. Check the correct contact area is achieved(see diagram above - Sanding Pad Static ContactArea)

An alternative method is to lightly dampen therubber sanding pad and then place the glasssheet across the two castors and sanding pad.Apply light pressure to the glass sheet, which willwitness the dampened area of the sanding padin contact with the glass.

WARNING - use toughened glass onlywith a minium thickness of 6mm (¼”)with rounded/polished edges. Take carewhen handling glass. Always use suitablegloves, eye protection and protectiveclothing.

2 To adjust the castors loosen the two castor locknuts using the special tool Part No. 011720 and5mm ball allen key. Adjust the castors and checkthe contact area on the sanding pad. When thecontact area is correct tighten the two castor locknuts securely. Use a suitable thread lockcompound. Finally check the contact area is stillcorrect after tightening the castor lock nuts.

4. Trim the sanding pad as detailed above.

Electrical Testing.

CAUTION - testing for electrical safetyshould only be undertaken by acompetent person and all resultsrecorded. Do not exceed 1250 voltinsulation test duration of 3 seconds.

CAUTION - when undertaking afunctional (run) test make sure themachine is secure. Remember thesanding disc will rotate..

1. Examine the power cable for damage. If theouter insulation shows the slightest of abrasionsor the inner conductors are exposed then thecable must be replaced. The cable must not berepaired with tape or insulation sleeve.

2. Open and check the mains plug for condition,loose connections, damaged wires, etc.

3. Remove the four Screws Ref.1 and lift off theCover Motor Ref.4 to check the switch,connections, leads etc. Pay special attention toany gaskets, ‘O’ rings and seals intended toexclude dust from the switch and switch housingarea. These must be maintained in goodcondition.

Carefully brush and vacuum clean the switchand brush block assembly and inside the covermotor.

4. Refit the cover motor taking care not to trap anyleads.

5. Using a piece of insulation tape or a small softwedge lock the bias off switch in the ‘ON’position.

6. Use the standard procedure test for electricalsafety (Class I Earthed Appliances [U.K.]). Donot exceed 1250 volt insulation test duration of 3seconds.

7. Record the test results.

8. Complete a functional (run) test and recordresults.

10

FAULT FINDING

FAULT CAUSE ACTION

"# $ �#� �� %& "# ��'� � �( �� # ��'� � �( �� #�� # ��'� �%��()& ��'� �%��()&

"# $�� %�#� � '��& *�( � �# $�� %�#�&

"# ��(� �� (�'& �#�� # $ � ��'��$�(�� '��# �# $ �#�+�� ( �( � � � &

"# $ �#� '�(( �� %� "# �%�� ,%((& *�( � �# � �� %�� %��& $��) �# �(��# �%�� &

"#� �� %�� # -�� # $ �#� ,��$�%�� %�& �# ��'� �%��(). �%� �#

$ �#� �� #�� ,��%��&

"# $ �#� �� "# � �� $ �& �#�� ( � �# � �� ()& � �&

"# � �� %� �, �#�� /%�� # � ��& �/%��$�&

"# � �� %�� "# $ �#� �� * � �# ��%��. �� # '��& �� ()& ��() ��%� '# � �� &

"# $ �#� �%� �(�'& "# ��(� �� (�'& �#�� # �%��() ��(� &

0, 1�� ( � �� %�� %��2 �� (�&

� $�� %�# �� $ �� #�� ,�� ( �� & �# $�� %�#�&

11

12


142

10

11

65

16

1217

7

13

14 15

65

22

23

24

25

18

19

20

21

26

27

28

29

31

32

33

3435

25

36

60

59

58

55

41

54

53

20

45

5148

50

47

46

27

49

48

39

44

6143

42

5

37

40

9

8

6

30

56

57

52

69 70

DISC FLOOR SANDER

MODEL HT7-2

DISC FLOOR SANDER

MODEL HT7-2

OWNERS MANUAL & OPERATING INSTRUCTIONSOWNERS MANUAL & OPERATING INSTRUCTIONS

From Serial Number00446 - 110/120 Volt00634 - 110/120 Volt00487 - 220/240 Volt

(Excl. North America)

(North America)

From Serial Number00446 - 110/120 Volt00634 - 110/120 Volt00487 - 220/240 Volt

(Excl. North America)

(North America)

NOVEMBER 2000NOVEMBER 2000 REF. 69 PART # 011680REF. 69 PART # 011680

PRIN

TED

INTH

EU

KPRIN

TED

INTH

EU

K

DISC FLOOR SANDER

MODEL HT7-2

DISC FLOOR SANDER

MODEL HT7-2

OWNERS WORKSHOP MANUALOWNERS WORKSHOP MANUAL

NOVEMBER 2000NOVEMBER 2000 REF. 70 PART # 011820REF. 70 PART # 011820

PRIN

TED

INTH

EU

KPRIN

TED

INTH

EU

K

250

HIR

ETEC

H

SERV

ICE

TO

OL

13


1 010010 4 Screw2 011600 1 Switch 220/240 Volt (Bias Off)2 011610 1 Switch 110/120 Volt (Bias Off)4 010050 1 Cover Motor5 010070 1 Housing Motor6 010080 1 Strain Relief7 010090 1 Cable Main Assembly 220/240 Volt (UK)7 010100 1 Cable Main 110 Volt (NA)7 010110 1 Cable Main Assembly 220 Volt (EEC)7 010120 1 Cable Main Assembly 240 Volt (AUS)7 010130 1 Cable Main Assembly 110 Volt (UK)8 010140 2 Handles Pack of 29 010150 4 Screw Handle10 010160 1 Cable Switch Assembly11 010170 1 Brush Block Assembly12 010180 4 Brush Motor13 010190 4 Screw Pack of 414 010200 4 Washer15 010210 4 Screw16 010220 4 Screw and Washer Set17 010230 4 Brush Spring18 010240 1 Field 110/120 Volt HT718 010250 1 Field 220/240 Volt HT719 010260 2 Washer Clamp20 010270 5 Washer Lock21 010280 2 Screw22 010290 1 Baffle23 010300 3 Screw24 010600 1 Spring Washer25 010320 2 Bearing26 010330 1 Armature 110/120 Volt26 010340 1 Armature 220/240 Volt27 010350 3 Key28 010360 1 Fan Motor29 010370 1 Gasket30 010380 1 Plate Exhaust31 010390 1 Fan Intake32 010400 1 Ring Retainer33 010410 1 Spacer Bearing34 010420 1 Seal35 010430 1 Ring Retainer36 010440 1 Pinion37 010450 1 Housing Gear39 010470 4 Screw40 010480 1 Frame Bag Support41 010490 1 Bag Dust Cloth42 07038 25 Disposable Paper Dust Bag HT7/HTF

Pack 2 (box 25)42 07040 50 Disposable Paper Dust Bag HT7/HTF

(box 50)43 010510 2 Clip Wrench44 010520 2 Screw45 010530 2 Castor & Nut

46 010540 1 Spring Load47 010550 1 Shaft Drive48 010560 2 Bearing49 010570 1 Gear Drive50 010580 1 Ring Retaining51 010590 1 Cover Gear53 010610 3 Screw54 010620 1 Guard Disc55 010630 1 Retainer56 010640 4 Shim57 012310 1 Sanding Pad (Metal Backed)58 010660 1 Washer Clamp59 010670 1 Bolt Clamp60 010680 1 Pin Cotter61 010690 1 Wrench62 010720 1 Washer, Clamp and Pin Cotter Kit65 010750 2 Brush Shunt69 011680 1 Owners Manual & Operating Instructions70 011820 1 Owners Workshop Manual

��

Special Tools

250 011720 1 Service Tool - Castor Adjuster250 011730 1 Service Tool - Sanding Pad

Fitting/Removal H/D250 011731 1 Service Tool - Sanding Pad

Fitting/Removal250 011740 1 Service Tool - Pinion Fitting/Removal250 011850 1 Service Tool - Extractor Gear Cover250 011860 2 Service Tool - Extractor Seal

110 010760 1 Carton Transit100 011270 1 Grease Gear Disc Floor Sander

Consumables

��

��

14

HT7-2 CIRCUIT DIAGRAM


This declaration identifies the product, manufacturer's name and address, and applicable specificationsrecognised in the European community.

15


Manufacturer's Name:

Manufacturer's Address:

declares that the product:

Product Name:

Model Name:

conforms to the following:

following the provisions of the directives:

electrical safety test procedures comply with:

Hire Technicians Group Ltd.

Chalk Hill House8 Chalk HillWatfordHerts Wd19 4BH

Hiretech Disc Floor Sander

HT7.2 230 Volt 50Hz Insulation Class 1HT7.2 110 Volt 50Hz Insulation Class 1

Machinery Directive (Harmonised) 89/392-EU as amendedLow Voltage Directive (Harmonised) 73/23/EU as amendedElectromagnetic Compatibility Directive 89/336/EU as amended

89/392/EU, 93/44EU, 73/23/EU, 93/68/EU, 89/336/EU, 91/368/EU,92/31/EU

EN60 335-1-88 (HD 251-1-3) BS 3456-201 EN292-1-91EN292-2-91 EN60204-1-92EN55014-93 (BS 800) EN 50082-1-92IEC 745-2-4 (HD 400.2) (BS 2769-2-2.4)

IEC 335 pt. 1-2, HD251 1-3 1982, BS 2769 & 3456, CSA C22.2,KEMA K78A1/W1 & W3, NEMKO 503./89, DIN VDE 0700 1/04.88HD 264.S2 15/07.86

Where the product is licensed to carry a National Approval Mark it iscertified that all such products comply with the terms of that license.

C.J. Hedger, Director of Engineering. 1 July 2003

16

SERVICE & REPAIR

Contact your reseller for the name of your local service agent. Service and repairs undertaken by non-approvedservice agents will void the product warranty. If you should have difficulty in obtaining service please contact yourdistributor nearest to you at the address given below.

For the latest list of Hiretech dealers check on the Hiretech web site at www.hiretech biz/contact/dealerlist.html.

��

Hiretech Pty Ltd

AUSTRALIA

Devomat Industries N.V.

BELGIUM

Deltaquip Supplies Ltd

CANADA

VIF Diffusion

FRANCE

Tool Matic A/S

DENMARK

Kage Enterprises

REPUBLIC OF IRELAND

Turner Morris (Pty) Ltd

Hire Technicians Group Ltd

UNITED KINGDOM

Hiretech Inc

USA

11 Government House Drive Tel: +61 247 356688Emu Plains Fax: +61 247 356682NSW Email: [email protected] Web: www.hiretech.biz

'FL. Geversstraat 31 Tel: +32 3 457 94 24B-2650 Fax: +32 3 457 49 24Edegem Email: [email protected]

Web: www.devomat.be

2282 Alpha Avenue Tel: +1 604 298 0566Burnaby B.C. Fax: +1 604298 8996V5C 5L6 Email: [email protected]

Web: -

rue du Chateau-BP70112 Tel: +33 320 20788059052 Roubaix Fax: +33 320 207889Cedex 1 Email: [email protected]

Web: -

Vedskollevej Tel: +45 56250708Herfolge Fax: +45 562507054681 Email: [email protected]

Web: www.tool-matic.dk

73 New Road Tel: +353 1 459 2454Clondalkin Fax: +353 1 459 2535Dublin 22 Email: -

Web: -

39 Robyn Road Tel: +27 11 618 4313Benrose Fax: +27 11 618 2620P.O. Box 27252 Email: [email protected]

[email protected]: www.turnermorris.co.za

Chalk Hill House Tel: +44 01923 3324248 Chalk Hill Fax: +44 01923 332425Watford Email: [email protected] Web: www.hiretech.bizWD19 4BH

661 Route 3 Tel: +1 518 562 3272Unit A Fax: +1 518 562 3279Plattsburgh Email: [email protected] 12901 Web: www.hiretech.biz

2011SOUTH AFRICA

��

HIRE TECHNICIANS GROUP LIMITEDCHALK HILL HOUSE, 8 CHALK HILL, WATFORD,

HERTS, WD19 4BH. UNITED KINGDOM

TEL: +44 (0)1923 332424 FAX: +44 (0)1923 332425E-mail: [email protected] Web: www.hiretech.biz

HIRETECH LIMITED WARRANTY�

Hiretech warrants to the original purchaser that the Hiretech machine covered by this warranty is freefrom defects in workmanship and materials. Should any part fail in the period of two years from the dateof the original purchase as a result of a defect, Hiretech will (at it’s option) either repair or replace thepart without charge provided that the machine has been operated in accordance with the OwnersManual and Operating Instructions.

Should any such defect arise, please contact your nearest authorised repair agent. Standard serviceover land mainland freight costs will be refunded on warranty repairs at the sole discretion of Hiretech orthe authorised repair agent. If the repair is non-warranty, the customer will be advised before any workis undertaken.

This warranty is the sole warranty by Hiretech and is in lieu of all other warranties express or impliedand releases Hiretech from all other obligations and liabilities.

This warranty does not apply to normal wear and tear to the machine, and in particular does not covernormal wear parts such as mains cable, wheels, switches, relays, brushes, rubber parts, hoses andbearings. This warranty also does not cover, and Hiretech will not be liable for, excessive wear causedby abnormal use.

Hiretech will under no circumstances be liable for alterations to the machine or for damage caused bythird persons, or for misuse or abuse of the machine, or damage caused during transportation. Repairsof the machine made or attempted by persons other than those specifically authorised by Hiretech shallrender this warranty void and Hiretech will not be liable for such repairs, the cost of such repairs, or theconsequences of such repairs. Where spare parts are used on the machine and they do not conform toHiretech specifications, this warranty will be rendered void and Hiretech will not be liable.

Hiretech will not be liable for any indirect or consequential loss, damage, cost or expense of any kindwhatever and however caused whether arising under contract, tort (including negligence) or otherwiseincluding (without limitation) loss of production, loss of profits or contracts or of operating time orgoodwill or anticipated savings.

� �

�

�

�

�

�

�

�

� �

�

ht7_eng

Documents