HireTech HT8 EX Owner's Manual & Operating Instructions

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Brand: HireTech

Category: Sander

Type: Owner's manual & operating instructions for HireTech HT8 EX

Pages: 16

Download HireTech HT8 EX Owner's manual & operating instructions

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and the edge of the sanding drum as follows;
200mm wide abrasive - gap 1.5 to 2.5mm
8in wide abrasive - gap 3/32 to 5/32in
Use Ref.143 PSTK: 024845 7mm (1/4”) spacer only for 8’
wide abrasive. Use 7mm (1/4”) plus1.5mm (1/16”) spacers
for 200mm wide abrasives.
CAUTION: Always check the width of the abrasive belt
being fitted.
Note: The Abrasive Guide fitted to the Drum Guard Ref.35 is fixed
and does not require adjustment.
5. Check the condition of the rear wheels (Rollers Ref.61). The
wheels must be free from dirt and rotate freely. Check the
condition of the Shaft Roller Ref.60, use a straight edge to
make sure the shaft is not bent.
Care of Motor
1. The motor must be kept free from grease and dust. DO NOT
use high pressure air to blow the motor clean. Use a vacuum
and soft brush to clean the motor and brush block assembly.
2. The motor brushes must be checked regularly, inspect the
brushes every three months or every 300 hours from new and
then every 100 hours of use thereafter.
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.
Brush ware is also indicated by the triangular ware indicator
stamped on genuine Hiretech motor brushes marked with the
HT symbol. See illustration opposite.
When any one motor brush is worn down to the ware
indicator inspect the brushes ever 100hrs. Replace all four
motor brushes when any ONE (1) motor brush is worn down
to the minimum brush length as indicated by the bottom of the
triangle stamped on the motor brush.
4. To inspect and replace motor Brushes Ref.104, with the brush
block assembly removed.
i. Remove the three Screws Ref.82 and remove the Wall
End Guard Ref.84 to expose the motor brush assembly.
ii. Remove the four retaining Screws Ref.31 from the Shield
Wall End Ref.30, insert two of the screws into the ‘jacking
holes’ situated adjacent to the countersunk retaining
holes.
iii. Carefully tighten these screws until the shield wall end is
jacked clear of the outer casting. Withdraw the shield-
wall end.
iv. With the brush block assembly complete and the
connecting leads still attached. You will note that as the
brush block assembly is withdrawn the brushes spring
towards the centre and often the brush springs fall clear
as the brushes are no longer at a height to retain them.
Take care not to lose any springs.
v. To remove a brush spring with a brush in the operating
position push the brush spring down and towards the
brush and lift out.
vi. Using a cross recess screwdriver remove the four brush
shunt (pigtail) retaining Screws Ref.105 and lock Washers
Ref.100.
vii. Remove the four brushes. Remove the two jacking screws.
viii. Thoroughly clean the brush assembly and housing using
a soft brush and a suitable vacuum cleaner.
ix. 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 in length then replace all four
brushes.
Motor Brush
x. When replacing brushes ensure free movement in each
brush holder and fit the brush with the shunt (pigtail)
towards the field coil. Ensure that each brush shunt is
connected securely with the screw, and lock washer, two
spare screws and lock washers are provided with each
pack of brushes. Do not fit the brush springs at this stage.
xi. Pull each brush up to the top of the holder using the shunt
wire to retain it in this position for the next stage.
xii. Enter the assembly into the main frame taking care to
avoid contact between the brushes and the commutator of
the armature, that the shield wall end is correctly aligned
with the main frame and that no leads are trapped. There
is a depressed pattern on the shield wall end and on the
main frame to assist alignment. Both the bearing fit and
the main frame fit are ‘light contact’ and may require
lightly tapping into position using a soft mallet. DO NOT
FORCE.
xiii. Replace and tighten the four countersunk Screws Ref.31.
xiv. Remove the four brush block retaining Screws Ref.31 and
the single timing Screw Ref.34 from the Shield-Wall End
Ref.30. The brush block assembly is now free to rotate.
To fit the brush springs rotate the brush block assembly
counter clockwise (over towards the rear of the machine)
until the lower brush holder is accessible, fit the brush
spring by inserting into the holder with the coil spring
over the brush then push down 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 spring and brush for correct alignment and
free movement.
xv. Rotate the brush block assembly clockwise and repeat
to fit the remaining three springs. The switch and field
cables restrict the movement of the brush block assembly,
take care not to loosen or damage these cables.
xvi. Return the brush block assembly to its original position
and align the timing notch in the block with the timing
hole, screw the timing Screw Ref.34 into position.
xvii. Secure the brush block assembly using the remaining four
screws Ref.34. DO NOT OVER TIGHTEN.
xviii. Finally check that all cables are well clear of moving
parts before refitting the guard wall and securing with
the 3 Screws Ref.82.
Note: To inspect and replace the motor brushes while retaining the
brush block assembly in place repeat the procedure xiv. to xviii.
above.
8
Minimum Brush Length
12mm ( /” )
1
2
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