28
Service and Repair Manual
Model 900/950/990
1.
Mount the clutch torque setting rig (Pt No.
9170 0236 50) in a vice and fit the clutch assembly
into the rig body with the pinion uppermost.
2.
Insert a 3/16in Allen key into the pinion and rotate
counterclockwise and note the spring balance
reading when the clutch starts to slip. The reading
should be between 7-8lb (approximately 6 Nm), if
the clutch slips below this figure tighten the clutch
nut and repeat the test.
3.
If during the test the clutch fails to slip remove the
clutch assembly from the rig, replace the clutch
spring (item 329) and repeat the test.
4.
When the torque setting is completed secure the
clutch nut by bending up the clutch lock washer
(item 328).
Adjusting the
clutch
(Model 950
only)
336
337
338
339
345
344
343
Clutch assembly
1.
Mount the motor case in a vice, between soft
metal jaw plates, with the gear carrier uppermost.
2.
Fit the drive shaft thrust washer (343) and thrust
race (344) to the drive shaft (345). Insert the
drive shaft into the drive shaft bearing in the gear
carrier.
3.
Insert the clutch assembly into the gear carrier
ensuring that the clutch and drive shaft pinions
are correctly engaged.
Mounting the
drive shaft
(Model 950
only)
1.
Fit the following items to the clutch shaft in
sequence:
a) clutch shim (334),
b) clutch thrust race (335),
c) clutch bearing (336),
d) clutch thrust race (335),
e) clutch shaft tail bearing (337) and
f) clutch shaft bearing cap (338).
Secure the bearing cap with 2 screws (339).
2.
Turn the drive shaft (345) by hand. The drive shaft
should be free to turn with a minimum of backlash
between the clutch pinion and the drive shaft. If the
backlash is excessive remove the clutch shaft
bearing cap (338) and add a shim (334). Refit the
bearing cap and four screws (339).
Note:
With service tool fitted this is checked by
rotating the clutch assembly by hand.
Adjusting the
drive shaft
backlash
(Model 950
only)
Clutch assembly
Clutch torque setting rig
345
334
335
341
Fig. 34
Fig. 35
Fig. 36
Summary of Contents for 900
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