on differential housing (Fig. 33). To adjust the backlash
move the ring gear toward or away from the pinion. This
is done by backing off one adjusting ring and advancing
the opposite ring the same amount.
Fig. 33. Setting Gear Lash
When original gear and pinion sets are being
reinstalled the wear pattern of the gear teeth must be
considered in the backlash adjustment. Gears that have
been in service for long periods form running contacts
which should not be greatly changed. If, in checking
backlash, the amount measured is in excess of the
amount shown on the ring gear, the lash may be reduced
only in the amount that will avoid overlap of the worn
tooth section (Fig. 34). A slight overlap at the worn
section will cause gear operation to be noisy and rough.
Fig. 34. Examples of Lash Adjustment Where Worn
Gears Are Reinstalled
Pinion Too Deep
in Ring Gear
of Ring Gear
Preload Diff Bearings
To set the bearing preload, mount dial indicator at
side of ring gear (Fig. 35). With the bearing capscrews
loosened to permit bearing movement, loosen adjusting
nuts only enough to notice end play on indicator.
While gear is held in .000 end play and before
loading bearings, check gear for runout by
revolving ring gear. If runout exceeds .2 mm
(.08"), remove differential and check for cause.
Tighten both adjusting nuts from .000 end play to
preload the differential bearings (see "Specifications" ).
Tighten bearing cap bolts to specified torque (see
Recheck gear lash to make certain that the lash
setting has not been changed.
Install adjusting ring locks and cotter pins.
Fig. 35. Adjusting Bearing Preload
PRINTED IN UNITED STATES OF AMERICA