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Type 1:
a. Install the gear coupling, plate
washer, and self-locking nut. Do
not install spacers yet. Tighten
nut gradually until proper bearing
preload is reached. Overtightening
will damage the bearings.
NOTE:
This preload is determined by
turning the shaft with a torque
wrench and measuring the resistance
of the bearings to the rotation of
the shaft.
b. Remove the nut and washer. Use a
dial indicator and dial gauge stand
(Special Tool) to measure the
distance from the coupling shoulder
("a" in illustration) to drive pinion
shoulder ("b").
c. Choose spacers that will reduce
clearance at "c" in the illustration
to 0.02 mm (.0008 in) that is, the
thickness of the spacers must be
0.02 mm less than the "c" dimen-
sion.
d. Install the spacers, plate washer,
and nut. Tighten nut to specified
torque and check preload.
Specified torque: 7.5-8.5 m-kg (54-61 ft-lb)
Preload:10-12 cm-kg (9-10 in-lb)
e. If the preload is less than specified,
reduce the spacer thickness by 0.02
mm (.0008 in) more (total gap to
0.04 mm). If preload is still not to
specification, reduce gap in 0.02
mm steps until the preload is correct.
Check for correct assembly of parts.
f. If the preload is over specification,
increase the spacer thickness by
0.02 mm
preload.
in) and recheck
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