27
Service and Repair Manual
Model 900/950/990
Note:- Before assembly, follow greasing instructions.
1. Position the motor case (149) in a vice, using soft
metal jaw plates.
2. Fit the crank pin screw (312, 212, 412, 512),
crank pin bush (311, 211, 411, 511) and crank
pin nut (306, 206, 406, 506). Fit the thrust
bearing (314, 214, 414, 514) and the two thrust
washers (313, 213, 413, 513) onto the crank disc
(311, 211, 411, 511). Do not fit shims at this
stage.
Note: The crank pin screw and nut have left-hand
threads.
3. Fit the crank disc into the gear carrier (310, 210,
410) and carrier to motor case. Secure with a
screw (320, 220, 420, 520) and spring washer
(319, 219, 419, 519).
Assembling
the crank
disc (All
models,
Model 950
shown)
1. Press the bearing (332) into the gear (331)
2. Put clutch peg spanner in vice and place clutch
hub (333) onto pegs.
3. Fit and tighten the pinion (341) and the following
items in sequence:
a) clutch plate (330) with coating up,
b) gear (331),
c) clutch plate (330) with coating facing
the gear,
d) clutch spring (329) with concave face
to the clutch plate,
e) clutch lock washer (328)
f) clutch lock nut (327)
Assembling
the clutch
(Model 950
only)
341
327
328
329
331
332
330
333
1. The backlash between the crank disc assembly and
the motor drive is set to the limits, 0.05mm
(0.002in) and 0.08mm (0.003in). The backlash is
adjusted by adding shims to the crank disc drive
line behind the thrust race.
2. Using a feeler gauge, rotate the crank disc and
measure the gap between the back of the crank disc
and the thrust race. This should be done at the point
closest to the mesh of the crank gear and the motor
pinion.
3. Rotate crank slowly with feeler gauges in position
until it is possible to lightly nip the feelers when the
gear is rotated.Check measurement and subtract
0.05mm (0.002in) 0.08mm(0.003in)and add shim to
set backlash the running clearance.
4. Fit the three remaining gear carrier securing screws
(320, 220, 440, 520) and spring washers (319, 219,
419, 519).
Adjusting
the gear
backlash
(All models,
Model 950
shown)
149
319
419
519
318
418
518
feeler gauge
311,
211
411
511
319,
219
419
519
320,
220
420
520
149
313,
213
413
513
366,
214
414
514
312,
212
412
512
310,
210
410
510
306,
206
406
506
320
420
520
Fig. 33
Fig. 31
Fig. 32
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