HireTech HT7-2 User manual

SANDING PAD FITTING & MAINTENANCE INSTRUCTIONS
MODELS: HT7-2
JULY 2003
DISC FLOOR SANDER
PRINTED IN THE UK
PART No. 010655-0
© HIRETECH

1
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.
1 The sanding pad is worn below its minimum
tread thickness of 4mm ( / ”)
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.
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.
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 Removing/Replacing the Sanding Pad
Removal and Replacement of the Sanding Pad
5
32
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.
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 gain
access to other components or to remove an
obstruction from the dust pick-up.
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
Castors.
5 The castors have been replaced and/or
adjusted.
CONTACT AREA
Sanding Pad Static Contact Area

2
DRUM ASSEMBLY
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.
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.
WARNING - use toughened glass only
with a minium 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.
3 Trim the sanding pad as detailed above.
Sanding Pad Trimmed Contact Area
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“) .

HIRETECH HT7-2 DISC FLOOR SANDER PARTS DRAWING
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69 70
DISC FLOOR SANDER
MODEL HT7-2
DISC FLOOR SANDER
MODEL HT7-2
OWNERS MANUAL & OPERATING INSTRUCTIONSOWNERS MANUAL &OPERATING INSTRUCTIONS
From Serial Number
00446 - 110/120 Volt
00634 - 110/120 Volt
00487 - 220/240 Volt
(Excl. North America)
(North America)
From Serial Number
00446 - 110/120 Volt
00634 - 110/120 Volt
00487 - 220/240 Volt
(Excl. North America)
(North America)
NOVEMBER2000NOVEMBER2000 REF. 69 PART# 011680REF.69 PART # 011680
PRINTEDIN THE UKPRINTEDIN THE UK
DISC FLOOR SANDER
MODEL HT7-2
DISC FLOOR SANDER
MODEL HT7-2
OWNERS WORKSHOP MANUALOWNERS WORKSHOP MANUAL
NOVEMBER2000NOVEMBER2000 REF.70 PART# 011820REF.70 PART # 011820
PRINTEDIN THE UKPRINTEDIN THE UK
© HIRETECH July 2003
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HIRETECH
SERVICE TOOL