HireTech HT7 System manual


2016/11 © Hiretech Part # 011680
OWNERS MANUAL & OPEARTING INSTRUCTIONS
HT7 DISC FLOOR SANDER
From Serial Number
00607 (240/240 Volt) & 00466 (110/120 Volt)

WARNING
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 and damage to the
machine and floor may result.
WARNING: Risk of explosion.
Floor sanding can result in an explosive mixture of fine
dust and air. Use this floor-sanding machine only in a well-
ventilated area free from any flame, match or source of
ignition.
WARNING: Risk of fire.
Never leave the floor sander unattended with dust in the
dust bag.
WARNING: Risk of potential injury.
Moving Parts - to reduce the risk of injury, unplug the
machine before replacing abrasive sheets or carrying out
any form of adjustment or servicing.
NORTH AMERICAN SAFETY INSTRUCTIONS
WARNING: This floor sanding machine must be grounded.
This floor-sanding machine shall be grounded while in use to protect
the operator from electric shock. The machine is provided with a
three-conductor cord and a moulded three-contact grounding
type attachment plug to fit the proper grounding type receptacle.
The Green (or Green and Yellow) conductor in the cord is the
grounding wire. Never connect this wire to any pin other than the
grounding pin of the attachment plug.
This floor-sanding machine is provided with an attachment plug
as shown in sketch A. It is intended for use on a nominal 120 volt
circuit. If a properly grounded receptacle as shown in sketch A
is not available, an adaptor as shown in sketch ‘C’ should be
installed as shown in sketch B if the outlet box that houses the
receptacle is grounded. Be sure to fasten the grounding tab with a
metal faceplate screw.
MAINS CABLE WIRING - PLUG
USE & APPLICATION
This machine is intended for commercial use connected with the
laying and maintaining of wooden floors and decks.
These types of surfaces may be found both in commercial and
household environments.
SPARE PARTS
Use Hiretech genuine spare parts only for service and repair.
Use of non-approved parts will void the product warranty. See
the back cover of this manual for the terms and conditions of the
Hiretech Limited Warranty.
Hiretech reserves the right to make changes or improvements to it’s
products without prior notice.
For the latest product news and updates, spare parts, downloads
and service information visit www.hiretech.biz
ATTACHMENT PLUG SKETCH ‘C’
METAL
SCREW
COVER OF GROUNDED
OUTLET BOX SKETCH ‘B’
ADAPTER
GROUNDING
MEANS
COVER OF GROUNDED
OUTLET BOX SKETCH ‘A’
GROUNDING PIN
CONTENTS
Warning 1
North American Safety Instructions 1
Mains Cable Wiring - Plug 1
Use & Application 1
Spare Parts 1
Specification 2
Safety 2
Set Up 2
Preparation 3
Operation 3
Floor Sanding Technique 4
Floor Types 4
Floor Sanding Technique 5
Floor Sanding Abrasive Guide 5
Service & Routine Maintenance 6
Fault Finding 8
Parts Diagram 9
Parts List 10
Circuit Diagram 10
1

SPECIFICATION
The HT7-2 Hiretech Edger (Disc Floor Sander) will sand hard and
soft wood floors, cork and composition floors and any solid wood
surface that requires rapid sanding and levelling to a fine finish.
Ideal for confined areas such as closets and stair treads the HT7-2
will sand right up to the edge of a floor without damage to the base
(skirting) board. Completely self contained with a high efficiency
dust pick-up the HT7-2 is a high performance sander suitable for
professional and home owner use.
Power Supply 110/120 V 50/60 Hz
220/240 V 50/60 Hz
Off Load Current 110/120 V 8A
220/250 V 5A
Average Load Current 110/120 V 15A
220/250 V 8A
Noise 100 dBa at 1metre (3’ 3”)
Vibration 0.04 m/s² r.m.s.
Switch Bias Off, double pole.
Motor Continuous heavy duty AC/
DC self cooling 4 brush.
Motor RPM 13,000
Drum RPM 3,300
Sanding Disc 7” (178mm) dia. Metal
backed and rubber bonded.
Disc Guard: High impact ABS with bronze
bush.
Drive Hardened steel alloy pinion
and large diameter aluminium
bronze drive gear.
Moving Parts Sealed for life ball bearings.
Dust Pickup Seated oversize vacuum fan,
disposable paper dust or cloth
bag
Abrasive 178mm (7”) dia. x 22mm
(7/8“) dia. centre hole. 24 to
120 grit fibre or paper back.
Power Cable 7m (23’) Non-marking outer
insulation.
Weight Net 16.4kg (36.2lbs)
Shipping Weight 18.0kg (39.7lbs)
Shipping Dimensions 39 x 32 x 35cm
(15.45 x 12.6” x 13.8”)
Warranty 2 years
Read the following Safety and Operational notes before
using your Hiretech Floor Sander.
SAFETY
1. For safety it is recommended that a residual current circuit
breaker (ground fault interrupter) is used with this machine.
2. Check the operating voltage is correct and that the machine is
switched OFF (O) before connecting 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 when changing the
abrasive disc, servicing the floor sander, replacing the dust
bag or leaving the machine unattended.
5. Always replace the dust bag (paper type) or empty the dust
bag (cloth type) when the dust in the bag reaches the ‘MAX’
line or when the machine is left unattended.
6. Never dispose of or empty the contents of the dust bag into a
fire or incinerator.
7. Never reuse the paper dust bag or use a non standard bag.
Cloth type bags must be in good condition with no holes.
8. Always wear a dust mask when using the floor sander,
handling the dust bag or cleaning the machine after use.
9. Wear ear protection when using the floor sander.
10. Ensure adequate ventilation of the work area to avoid the
formation of a combustible mixture of flying dust and air.
11. Never smoke when using or servicing the floor sander 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 to the machine
or abrasive disc is suspected.
14. Never allow the power cable to come into contact with the
sanding disc when the floor sander is in operation. If the
power cable becomes damaged and the inner conductors are
exposed switch the power OFF and remove the plug before
attempting to move the machine. The cable must be replaced
by an authorised agent or qualified electrician using genuine
Hiretech spare parts only.
15. Keep hands, feet and loose clothing away from all moving
parts of the machine.
16. Punch down or remove all nails, screws, tacks and other
fixings from the floor before sanding to prevent contact with
the sanding disc.
17. Never use the machine above waist height as control will be
lost.
18. Keep children and pets clear at all times.
19. If the machine should fail to operate refer to the fault finding
guide on page 8.
SET UP
Assembly and Transport
1. Always carry the floor sander by the two handles with the bag
frame in the up position and the power cable stowed around
the bag frame. Protect the sanding disc with an abrasive disc
and ensure that the clamp bolt is secure. Ensure that the floor
sander is secure and cannot move when being transported
in a vehicle. The floor sander is heavy. Take care when lifting
and carrying the machine.
2. To prepare the floor sander for use place the machine on the
floor and remove the cable from the bag frame. Check that the
cable is in good condition and that all fittings are secure.
3. Lower the dust bag support frame and fit a paper dust bag
following the instructions printed on the bag. Do not reuse or
use a non standard bag. If a cloth type bag is used ensure
that it is tied securely around the dust outlet and that the bag
is in good condition with no holes.
2

4. To dismantle the floor sander reverse procedure 2 to 3 above.
Installing Abrasive Disc
1. Ensure the power cable is disconnected from the power
supply.
2. Tip the floor sander upside down and rest the machine on it’s
top and handles.
3. Remove the Wrench Ref.61 from the clips inside the skirt of the
floor sander situated in between the castors and remove the
Bolt Clamp Ref.59 and Washer Clamp Ref.58 from the centre
of the sanding disc.
4. Select a suitable grade of abrasive disc (see Abrasive Paper
Guide on page 5).
5. Place the bolt clamp through the centre of the washer clamp
and abrasive disc and carefully thread the bolt into the
sanding disc.
CAUTION - never fit more than one abrasive disc . If more
than one abrasive disc is fitted the setup of the sander will
be affected and the clamp bolt and washer and sanding
pad will be damaged.
6. Using the wrench, tighten the bolt clamp ensuring that the
abrasive disc is centred and the washer clamp is properly
located. The bolt should be secure but do not try to over
tighten. Heavy grit abrasive discs will seat down as you
tighten the bolt so take care to ensure the washer clamp is
properly located. Heavy grit abrasive discs may not lie flat on
the sanding disc, this is quite normal and the abrasive disc will
flatten immediately upon operation.
7. Do not use damaged or incorrectly sized abrasive discs under
any circumstance, damage will result to the machine and
floor.
PREPARATION
1. Where possible remove all furniture from the area or room.
The HT7-2 Disc Floor Sander features an efficient dust
pickup, however, some dust will escape. Protect all vulnerable
furnishings with dust sheets.
2. Remove all tacks, staples and other unwanted fixings from the
floor. Failure to do so will result in damage to the abrasive
disc and sanding disc.
3. Punch all nails below the surface of the floor using a suitable
nail punch and hammer. Any screws used to fix boards should
be counter sunk below the surface. During sanding, any nails
or screws that become exposed must be punched or counter
sunk further.
4. Firmly fix all loose boards or blocks.
5. Remove heavy wax, grease and dirt deposits by hand.
6. Sweep and vacuum the floor thoroughly to remove dirt and
discarded fixings.
7. Ensure good ventilation by opening windows.
8. If sanding a work bench or similar work piece follow the
instructions above to prepare it ready for sanding. Make
sure that the work piece is secure. Never use the floor sander
above waist height.
Note: Use Hiretechgenuine floor sander abrasives for the best
sanding performance and finish.
OPERATION
1. Move the floor sander to the location of your work.
2. Make sure the switch is in the OFF (O) position then connect
the power cable to a suitable power supply ideally located
behind or to one side of the machine and work area.
3. Wear a dust mask and ear defenders.
4. Kneel behind the machine on one knee (use knee pads to
protect knees) and hold both handles with the power cable
held in the right hand in a small loop and then pass the cable
over the right shoulder. Tilt the floor sander back so that the
sanding disc does not touch the floor or work piece.
5. Switch ON by pushing the ON/OFF switch to (I) position and
hold in place with your thumb. To switch OFF (O), release the
pressure on the switch and it will automatically return to the
OFF position.
CAUTION - the HT7-2 Disc Floor Sander is a powerful
machine. Always ensure you have a firm grip before
switching on.
6. Now lower the floor sander slowly forward so that the abrasive
disc comes into contact with the floor or work piece. At the
same time move the machine in a sideways motion so when
the abrasive disc comes into contact with the work surface it is
moving to one side. This will ensure that the sander does not
dwell in one position and damage the floor or work piece.
CAUTION - to prevent damage to the floor surface, work
piece or machine follow these rules.
i. Always ensure that the floor sander is moving when in
operation and the sanding disc is in contact
with the floor.
ii. Never lift the back of the machine when sanding.
iii. Never apply pressure to try to increase the rate of sanding.
Damage to the floor or work piece will
occur.
iv. Never bounce or drop the floor sander on to the floor or
work piece, always lower the machine gently.
v. Never dwell in one place, move steadily at all times.
vi. Never allow the power cable to come into contact with the
sanding disc.
7. When the dust in the dust bag reaches the ‘MAX’ line stop
sanding. Switch OFF (O) and disconnect the power cable
from the power supply and remove the paper dust bag. Turn
the top of the paper dust bag over to stop the escape of 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 is used empty into a suitable
container being careful to contain the dust. Do not dispose of
the contents into a fire.
8. Fit a new paper dust bag, or refit the cloth bag. Reconnect the
floor sander to the power supply and continue sanding.
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, or empty the cloth bag as detailed in 7.
above. Never leave the floor sander unattended with a dust
bag in place containing dust.
10. On completion disconnect the power cable from the supply.
Remove and dispose of the paper dust bag, or empty the cloth
bag as detailed in 7. above. Replace the bag frame in its up
position and stow the power cable. Leave the old abrasive disc
3

in place to protect the sanding disc. Carry out maintenance as
recommended in Maintenance and Servicing.
DANGER - never leave the floor sander unattended with
dust in the dust bag. Always remove the dust bag and
dispose of into a suitable container.
FLOOR SANDING TECHNIQUE
HT8 Drum Floor Sander - a powerful floor sander designed for the
rapid levelling and sanding of all types of wood flooring excluding
thin laminated or veneered floors. Load the sander with abrasive
making sure that it is skin tight around the drum. Loose sheets
will tear. Place the sander on the right hand wall (unless you are
making an angled cut on uneven floors) with about two thirds of
the floor in front of you. Start the sander with the drum off the floor
then walk forward at an even pace and ease the drum on to the
floor. As you near the end of the pass, gradually raise the drum
off the floor. Practice this technique before turning on the sander.
Cover the same path you made on the forward cut by pulling the
machine backwards and easing the drum to the floor as you begin
the backward pass until you reach the original starting point, then
ease the drum off the floor.
When two thirds of the floor is sanded, turn the floor sander around
and sand the remaining third in the same way. Overlap the one
third area by 0.6 to 0.9 meters (2 to 3 feet ) with the two thirds
area to blend the two areas together.
WARNING: never bounce the sanding drum or dwell in
one place as this will sand dips and hollows in the floor.
HT7 Disc Floor Sander (Edger) - a powerful disc floor sander
designed for sanding along the edges of a floor without damaging
the baseboards or mouldings. Also suitable for smaller areas
where the HT8-1.2 Floor Sander will not reach like stair treads and
closets load the abrasive disc making sure the retaining bolt is tight.
Start the edger with the disc off the floor then lower the disc to
the floor as you move the sander. Work progressively moving the
sander in a sweeping motion from side to side.
HTF-2 Orbital Floor Sander - a orbital action floor sander designed
for re-finishing, sanding between coats of varnish and re-surfacing
floors in good condition. Load the abrasive sheet, pad or strip.
Start the sander, move immediately and sand in the direction of
the grain using the same technique as the drum floor sander. For
difficult to reach areas use the disc floor sander with a fine grit
abrasive, or sand by hand.
Hand Sanding - to sand difficult to reach areas scrape and sand
the floor by hand. Use a scraper to remove old finishes, always
scraping in the direction of the grain, and then sand by hand using
the same grit abrasive as you finished with when machine sanding.
See Floor Sanding Technique diagrams on page 5.
FLOOR TYPES
Plank & Strip Floors
Old floors in good condition - when the floor is in good condition
- no uneven edges, cupping or crowning of planks and strips - and
you want to re-surface the floor, sanding back to new wood, start
sanding in the direction of the planks or strips - with the wood grain.
Start with a medium grit abrasive. Complete the first cut with the
HT8-1.2 Floor Sander then sand up to the baseboards and door
thresholds with the HT7-2 Disc Floor Sander, using a medium grit
abrasive, blending the edges in with the main floor area. Sweep
the floor. Using a medium/fine grit abrasive, sand the main floor
area with the drum sander and then complete the floor with the
edger using a fine grit abrasive. Sweep the floor. Finish sanding
the main floor area with the drum floor sander using a fine grit
abrasive. If the floor is in particularly good condition (level with no
deep scratches or blemishes) you may re-surface the floor using the
HTF-2 Floor Sander, however, as the sanding action of this machine
is less aggressive than the HT81.2 Floor Sander the job will take
more time.
Uneven floors - when the floor is uneven sand diagonally at 45o
across the room in both directions using the HT8-1.2 Floor Sander
with a coarse grit abrasive. Only make one cut on both diagonals,
this will achieve a basic level. Now complete the floor as for a
level strip or plank floor. Use the same grit abrasive as was used
on the 45o cut for the first cut parallel to the planks or strips.
Floors with an existing finish - when re-finishing a floor remove as
little of the existing surface as possible. If the old finish is worn and
the floor is generally in good condition use the HTF-2 Floor Sander
with Hiretech abrasive pads and strips which have been especially
designed for re-finishing floors. These will maintain the integrity of
any stain used to colour the wood and prepare the surface for a
new coat of finish. If the floor is badly marked and scratched and
has to be sanded back to new wood use the HT8-1.2 Floor Sander
and HT7-2 Disc Floor Sander. Always try a medium grit paper first,
particularly on a diagonal cut. If 90% of the old finish is removed
and the floor is generally level, you do not need to use a coarse
grit abrasive.
Engineered and Thin Floors
Use the HTF-2 Floor Sander for engineered or thinner floors that
may have been subjected to repeated sanding. The HTF-2 will
remove old surface finishes and prepare the floor for re-finishing.
Sand the floor using the same method as a strip, plank, or parquet
floor. If the floor has deeper scratches or marks these should be
sanded out by hand and blended in with the main floor. To check
the wood depth in the floor remove a baseboard or moulding from
around the edge of the floor. This should provide access to the
edge of the floor for inspection.
Parquet & Block Floors
The grain of the wood will run in a number of directions so sand
the floor in the direction of the main source of natural light in the
room. If there is no source of natural light sand in the direction of
the longest side of the room or, if the room is square, in the direction
the furniture is laid out and how people normally use and view the
room.
This technique will help mask any imperfections in the floor.
Complete the sanding operation as detailed for plank or strip
floors.
Between Coats of Finish (varnish)
Use the HTF-2 Floor Sander to sand between coats of floor finish,
particularly when using water based varnishes. These types of
finishes tend to raise the wood grain when first applied to raw
wood. Allow each coat of varnish to dry completely following
the manufactures directions. Use Hiretech abrasive pads to sand
between each coat of varnish. The fine abrasive pads will remove
light brush/applicator marks and raised grain while maintaining
the integrity of the coat of varnish applied.
4

5
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.
Abrasive Grade Floor Type and Condition Grit P24 Open Coat (Very Coarse non-glogging)
For removing surface coatings from old floors such as varnish, stains and wax polishes. For the rapid sanding and removal of scratches and marks. Sanding level the joints of sub-flooring like particle board and masonite.
Grit P24 (Very Coarse)
For the rapid sanding and removal of scratches and marks. Sanding level the joints of sub-flooring like particle board and masonite.
Grit P36 to P50 (Coarse/Medium)
For removing surface coatings from old floors such as varnish, stains and wax polishes. For the rapid sanding and removal of scratches and light marks. Sanding level the joints of sub-flooring like particle board and masonite.
Grit P60 to P80 (Medium)
For the rapid sanding and removal of scratches and light marks. Sanding level the joints of sub-flooring like particle board and masonite.
Grit P100 to P120 (Medium/Fine)
Intermediate sanding of all types of wood floor. For final sanding of all types of wood floor.
Grit P150 - P180 (Fine/Very Fine)
For final sanding of all types of wood floor. First sanding of cork or composition floors. For sanding between coats of solvent based and 2 pack varnishes.
FLOOR SANDING TECHNIQUE
Hiretech Abrasives
HT8/DU8
FLOOR SANDER
SHEET
20 & 50/CASE
HT8 EX
FLOOR SANDER
BELTS
5/CASE
HT7/SUPER 7
EDGER DISC
FIBRE BACKED
25/CASE
HT7/SUPER 7
EDGER DISC
PAPER BACKED
25 & 50/CASE
HTF FLOOR
SANDER SHEET
ADHESIVE
BACKED
HTF ABASRIVE
PAD
20/CASE
Hiretech recommend the following abrasive range which are suitable for all floor types and P16 - - 01025 - - - P24 Grit Open Coat 01001 - - 01044 - - P24 Grit 01002 01010 01026 - - - P36 Grit -01011 ---- P40 Grit 01003 01012 -0104501750- P50 Grit -01013 01027--- P60 Grit -01014 --01751- P80 Grit 01004 01015 01028 01046 01752 - P100 Grit -01016 ---- P120 Grit 01005 01017 01030 01048 01754 - P150 Grit -01018 ---- P180Grit ----01756- P280 Grit/Backing Pad -----01769
FLOOR SANDING ABRASIVE GUIDE

SERVICE & ROUTINE MAINTENANCE
CAUTION: maintenance and repairs must be carried out
by authorised personnel only. To prevent injury, always
remove the power cable from the power supply before
undertaking any work on the machine. Do not operate this
machine unless it is fully assembled and all guards are in
place. Use Hiretech genuine spare parts only.
General
1. Always make a list when first examining the machine, to
remind you of parts or action needed on completion of repair/
service.
2. The HT7-2 is subject to high speeds. All screws should be
fitted using a suitable thread lock compound.
3. On completion of any work or service on an electrical tool
or appliance statutory safety tests must be carried out by a
competent person and recorded (see Testing for Electrical
Safety page 8).
4. The HT7-2 needs no lubrication during routine servicing.
5. Always ensure that the electrical supply is disconnected
before starting any routine servicing or repair.
Visual Inspection
1. To clean the machine and remove dust, use a vacuum cleaner
to avoid damage and prevent inhalation of dust.
2. Examine all guards and mechanical parts for condition
including the Disc Guard Ref.54 which should be undamaged
and moving freely.
3. Examine the sanding pad, a worn or damaged pad must be
replaced to maintain performance and to avoid injury. There
must be a minimum of 4mm ( 3/16”) ‘tread depth’.
4. Examine the power cable for damage. If the outer insulation
shows the slightest of abrasions or the inner conductors are
exposed then the cable must be replaced. The cable must not
be repaired with tape or insulation sleeve.
5. Ensure all labels are sound, readable and secure.
6. Check that the castors are sound and moving freely. If a castor
is found to be loose or damaged then the ‘cutting’ angle must
be checked and reset as necessary (see Setting Castors page
7 and 8. Replace damaged castors.
7. Check the condition of the Bolt-Clamp Ref.59 and clean the
threads.
8. Check that the Wrench Ref.61 is in place and in good
condition.
9. If a cloth type bag is in service check the condition, clogged
dust bags or bags with holes make for inefficient dust pickup.
Dust Control
1. Turn the sander upside down and rest the machine on the
handles. Check the dust skirt for pieces of abrasive disc and
build up of dust. Clean as needed.
Drive
1. The dive gear does not require maintenance under normal
operating conditions.
Lubrication
1. The HT7-2 features sealed for life bearings which do not
require any lubrication. In the unlikely event that a bearing
has to be replaced use a Hiretech genuine spare part only as
the grease contained in the bearings is special. A standard
bearing is not suitable and may result in further damage.
2. Should the gearbox require service the gear housing and
gears must be cleaned thoroughly and the gearbox refilled
with grease Part No. 011270. This is a special grease
designed for the high speed and temperatures generated
within the gear box. Under no circumstance must a standard
automotive grease be used. Using such a grease will result in
gear failure and damage to the motor and other components.
The grease may also melt and leak from the gear box staining
the floor or work piece being sanded.
Care of Motor
1. The motor must be kept clean and free from grease and dust.
2. The motor brushes must be checked regularly. As it is necessary
to remove the Cover Motor Ref.4 during routine electrical
testing, it is then a simple matter to check the condition of the
motor brushes and avoid costly breakdowns.
3. Replace ALL FOUR motor brushes when any one brush has
worn to 12mm (1/2”) or less in length. Brushes MUST slide
freely in the brush holders.
There is no need to remove or disconnect any internal leads
when changing the brushes, only the small braided shunt
(pigtail) is disconnected to release the brush.
4. To replace the motor Brushes Ref.12.
i. Remove the four Screws Ref.1 from the Cover Motor and
lift the cover off.
ii. Remove the four Spring Brush Ref.17 and set to one side.
The springs are removed by pushing the spring tag in
towards the brush and lifting out.
iii. Using a cross recess screwdriver remove the four brush
shunt (pigtail) retaining screws and lock washers Ref.16.
iv. Remove the four brushes.
v. Thoroughly clean the brush assembly and housing using a
soft brush and a suitable vacuum cleaner.
vi. Inspect the four brushes for damage or wear and if any
one brush is found to be damaged or worn to a length of
12mm (1/2”) or less then replace all four brushes. Always
replace all four brushes together.
Motor Brush
vii. When replacing brushes ensure that each brush moves
freely in each holder and fit the brush with
theshunt(pigtail)insuchapositionastoallowfreemovement
throughout the brush life. Ensure that each brush shunt is
connected securely with the Screw and Washer Ref.16.
(two spare screws and washers are provided with each
6
Minimum Brush Length
12mm ( /” )
1
2

pack of brushes). The brush should be fitted so that the
brush shunt (pigtail) is at the bottom of the brush.
viii. Refit the brush springs by inserting into the holder with the
coil spring over the brush then push in until
the tag comes into contact with the holder, slide the tag
away from the brush and release. The brush
spring will clip into position. Check the springs and brushes
for correct alignment and free movement.
ix. Carry out electrical safety test and record results (see
Testing for Electrical Safety page 8).
x. Finally check that all leads and cables are clear of moving
parts and will not be trapped when refitting the cover
motor.
xi. Refit the cover motor and secure with the four Screws
Ref.1.
Sanding Pad
It is very important to maintain the HT7-2 Edger sanding pad in
perfect condition for score free sanding and to maximise the life of
the abrasive disc.
In normal operation the sanding pad needs little maintenance
apart from periodic trimming, however, if the pad is worn below its
minimum thickness or it is damaged it must be replaced.
Reasons for Removing/Replacing the Sanding Pad
1. The sanding pad is worn below its minimum tread thickness of
4mm (5/32”)
2. Physical damage that cannot be removed by trimming.
3. To gain access to maintain/repair the fan, gears, motor and
bearings.
4. To remove an obstruction from the dust pickup.
Removal and Replacement of the Sanding Pad
1. Disconnect the edger from the power supply.
2. Turn the edger upside down and rest it on its handles.
3. Remove the Bolt Clamp (Ref.59) and Clamp Washer (Ref.58).
4. Using a 18mm (11/16“) hardwood dowel approximately
150mm (6”) long, lock the Fan Intake (Ref.31) in position to
stop it turning by inserting the dowel through the underside of
the edger to the rear of the sanding pad.
5. Using service tool Part No.011730 Sanding Pad Wrench,
remove the sanding pad in a counter clockwise direction (right
hand thread). Take care to support the edger.
Note: The sanding pad can be tight, if needed use a soft mallet to
tap the wrench to help removal.
CAUTION: when the sanding pad becomes loose
carefully remove it by hand. Take care not to lose the Shims
(Ref.56) which may come away with the sanding pad.
These shims, which may vary in quantity with a minimum of
two, are used on the Shaft Drive (Ref.47) to pack out the
sanding pad.
6. Thoroughly clean the Guard Disc (Ref.54) and refit all the
Shims (Ref. 56) if removed.
7. Fit a new sanding pad and tighten using the service tool.
Reasons for 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 gain access to other
components or to remove an obstruction from the dust pick-up.
5. The castors have been replaced and/or adjusted.
Trimming the Sanding Pad
1. Disconnect the edger from the electrical supply and place
the edger on a flat, smooth surface such as a work bench.
Visually check to see that only the front of the sanding pad is
in contact with the surface it is standing on. That is, the castors
are adjusted so that the edger is ‘tipped’ forward.
2. Use a piece of paper or 0.005” feeler gauge to check under
and around the sanding pad to confirm that only the front part
of the sanding pad is in contact with the surface it is standing
on.
The correct contact area is illustrated in the diagram below.
If the contact area is wrong or can not be identified accurately
check and adjust the castors as detailed below in - Adjusting
the Castor
3. To trim the sanding pad fix a piece of fine grit floor sander
abrasive (120 grit) face up to a solid flat board that is large
enough to stand on and operate the edger. Place the board
on a flat even floor and the edger on top of the board with the
pad over the abrasive. Do not fit an abrasive disc.
CAUTION: make sure that the Clamp Bolt (Ref.59) is
secure and properly tightened
4. Connect the edger to the power supply, stand on the board
and tip the edger back and switch ‘ON’. Carefully lower the
edger so that the sanding pad comes into contact with the
abrasive. Move the edger from side to side across the abrasive
under its own weight for a few seconds. Tip the edger back
and switch ‘OFF’
5. Disconnect from the power supply and check the condition
of the sanding pad. You should witness an even surface with
no high or low spots around the whole surface of the sanding
pad in the contact area as shown in the diagram below.
Note: Do not hold the edger in place, always keep it moving
across the abrasive sheet. Do not over trim the sanding
pad or you will reduce it’s life. Do not lift or force the edger
while trimming the pad, allow the edger to move under it’s
own weight. The sanding pad minimum tread depth is 4mm (
5/32“).
Adjusting the Castors
The castors are set to achieve the correct contact area across
the sanding pad as illustrated in the diagrams above.
1. To check the castor setting place a clean sheet of glass across
the two castors and the sanding pad. Inserting a 0.005”
feeler gauge (or a sheet of paper) between the glass and the
sanding pad. Check the correct contact area is achieved (see
diagram above - Sanding Pad Static Contact Area)
An alternative method is to lightly dampen the rubber sanding
pad and then place the glass sheet across the two castors and
sanding pad. Apply light pressure to the glass sheet, which
will witness the dampened area of the sanding pad in contact
with the glass.
7

8
WARNING: use toughened glass only with a minimum
thickness of 6mm (¼”) with rounded/polished edges. Take
care when handling glass. Always use suitable gloves, eye
protection and protective clothing.
2 To adjust the castors loosen the two castor lock nuts using the
special tool Part No. 011720 and 5mm ball allen key. Adjust
the castors and check the contact area on the sanding pad.
When the contact area is correct tighten the two castor lock
nuts securely. Use a suitable thread lock compound. Finally
check the contact area is still correct after tightening the castor
lock nuts.
4. Trim the sanding pad as detailed above.
CONTACT AREA
Sanding Pad Contact Area Sanding Pad Trim Area
Electrical Testing
CAUTION: testing for electrical safety should only be
undertaken by a competent person and all results recorded.
Do not exceed 1250 volt insulation test duration of 3
seconds.
1. Examine the power cable for damage. If the outer insulation
shows the slightest of abrasions or the inner conductors are
exposed then the cable must be replaced. The cable must not
be repaired 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 the Cover Motor
Ref.4 to check the switch, connections, leads etc. Pay special
attention to any gaskets, ‘O’ rings and seals intended to
exclude dust from the switch and switch housing area. These
must be maintained in good condition.
Carefully brush and vacuum clean the switch and brush block
assembly and inside the cover motor.
4. Refit the cover motor taking care not to trap any leads.
5. Using a piece of insulation tape or a small soft wedge lock the
bias off switch in the ‘ON’ position.
6. Use the standard procedure test for electrical safety
(Class I Earthed Appliances [U.K.]). Do not exceed 1250 volt
insulation test duration of 3 seconds.
7. Record the test results.
8. Complete a functional (run) test and record results.
CAUTION: when undertaking a functional (run) test make
sure the machine is secure. Remember the sanding disc will
rotate.
FAULT FINDING
FAULT CAUSE ACTION
The machines does not run. The power cable is not connected to the
power supply.
The motor brushes are worn
The voltage is too low.
Connect the power cable to the power
supply.
Replace the motor brushes.
Check the main power complies with the
machine’s serial plate data.
The machine runs slow. The voltage is low. Check the supply voltage.
If an extension lead is being used it is
undersized and/or it is coiled.
The machine will not pickup dust. The dust bag is full.
There is an obstruction in the dust pickup.
A motor brush is not making
Replace the paper dust bag or dust or
empty the cloth dust bag.
Disconnect the machine from the power
supply, turn the machine over and check
for obstruction.
Check and refit or replace the motor
brushes and/or the brush springs.
The machine does not sand evenly The sanding pad is damaged.
The castors are out of adjustment.
Check and service/replace the sanding
pad.
Check and adjust the castors.
The sander scores or burns the wood. The machine is not being operated
properly.
Read the instructions, do not apply
pressure when sanding.

PARTS DIAGRAM
HT7-2 Disc Floor Sander
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10
PARTS LIST
Ref PSTK Pack Qty Description
1 010010 4 Screw
2 011600 1 Switch 220/240 Volt (Bias Off)
2 011610 1 Switch 110/120 Volt (Bias Off)
4 010050 1 Cover Motor
5 010070 1 Housing Motor
6 010080 1 Strain Relief
7 010090 1 Cable Main Assembly 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 2
9 010150 4 Screw Handle
10 010160 1 Cable Switch Assembly
11 010170 1 Brush Block Assembly
12 010180 4 Brush Motor
13 010190 4 Screw Pack of 4
14 010200 4 Washer
15 010210 4 Screw
16 010220 4 Screw and Washer Set
17 010230 4 Brush Spring
18 010240 1 Field 110/120 Volt HT7
18 010250 1 Field 220/240 Volt HT7
19 010260 2 Washer Clamp
20 010270 5 Washer Lock
21 010280 2 Screw
22 010290 1 Baffle
23 010300 3 Screw
24 010600 1 Spring Washer
25 010320 2 Bearing
26 010330 1 Armature 110/120 Volt
26 010340 1 Armature 220/240 Volt
27 010350 3 Key
28 010360 1 Fan Motor
29 010370 1 Gasket
30 010380 1 Plate Exhaust
31 010390 1 Fan Intake
32 010400 1 Ring Retainer
33 010410 1 Spacer Bearing
34 010420 1 Seal
35 010430 1 Ring Retainer
36 010440 1 Pinion
37 010450 1 Housing Gear
CIRCUIT DIAGRAM
HT7-2 Disc Floor Sander
Ref PSTK Pack Qty Description
39 010470 4 Screw
40 010480 1 Frame Bag Support
41 010490 1 Bag Dust Cloth
42 07038 25 Disposable Paper Dust Bag HT7/HTF
Pack 2
42 07040 50 Disposable Paper Dust Bag HT7/HTF
(box 50)
43 010510 2 Clip Wrench
44 010520 2 Screw
45 010530 2 Castor & Nut
46 010540 1 Spring Load
47 010550 1 Shaft Drive
48 010560 2 Bearing
49 010570 1 Gear Drive
50 010580 1 Ring Retaining
51 010590 1 Cover Gear
52 010220 4 Screw & Washer Set
53 010610 3 Screw
54 010620 1 Guard Disc
55 010630 1 Retainer
56 010640 4 Shim
57 012310 1 Sanding Pad (Metal Backed)
58 010660 1 Washer Clamp
59 010670 1 Bolt Clamp
60 010680 1 Pin Cotter
61 010690 1 Wrench
62 010720 1 Washer, Clamp and Pin Cotter Kit
65 010750 2 Brush Shunt
69 011680 1 Owners Manual & Operating Instructions
70 011820 1 Owners Workshop Manual
100 011270 1 Grease Gear Disc Floor Sander
The following items are not illustrated.
Special Tools
250 011720 1 Service Tool - Castor Adjuster
250 011731 1 Service Tool - Sanding Pad
Fitting/Removal
250 011740 1 Service Tool - Pinion Fitting/Removal
250 011850 1 Service Tool - Extractor Gear Cover
250 011860 2 Service Tool - Extractor Seal
Consumables
010760 1 Carton Transit

HIRETECH LIMITED WARRANTY Hiretech warrants to the original purchaser that the Hiretech machine covered by this warranty is free from defects in workmanship and materials. Should any part fail in the period of two years from the date of the original purchase as a result of a defect, Hiretech will (at it’s option) either repair or replace the part without charge provided that the machine has been operated in accordance with the Owners Manual and Operating Instructions. Should any such defect arise, please contact your nearest authorised repair agent. Standard service over land mainland freight costs will be refunded on warranty repairs at the sole discretion of Hiretech or the authorised repair agent. If the repair is non-warranty, the customer will be advised before any work is undertaken. This warranty is the sole warranty by Hiretech and is in lieu of all other warranties express or implied and 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 cover normal wear parts such as mains cable, wheels, switches, relays, brushes, rubber parts, hoses and bearings. This warranty also does not cover, and Hiretech will not be liable for, excessive wear caused by abnormal use. Hiretech will under no circumstances be liable for alterations to the machine or for damage caused by third persons, or for misuse or abuse of the machine, or damage caused during transportation. Repairs of the machine made or attempted by persons other than those specifically authorised by Hiretech shall render this warranty void and Hiretech will not be liable for such repairs, the cost of such repairs, or the consequences of such repairs. Where spare parts are used on the machine and they do not conform to Hiretech 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 kind whatever and however caused whether arising under contract, tort (including negligence) or otherwise including (without limitation) loss of production, loss of profits or contracts or of operating time or goodwill or anticipated savings.
Every effort has been made to present all information in this publication accurately, however no liability is accepted for any inclusions or advice given or for omissions from this publication. Hiretech reserves the right to make changes or improvements to its products without prior notice. Hiretech®is a registered
trademark of Hire Technicians Group Ltd., all other trademarks are the property of their respective owners. © Hire Technicians Group Ltd.
MANUFACTURED BY
HIRE TECHNICIANS GROUP LIMITED
CHALK HILL HOUSE, 8 CHALK HILL, WATFORD,
HERTS, WD19 4BH. UNITED KINGDOM
TEL: [phone] FAX: [phone]
E-mail: [email protected] Web: www.hiretech.biz