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35
REAR AXLE
Caution:
Gear teeth may have sharp edges.
Paint right gear teeth with a marking compound on
both the drive and coast side.
Rotate ring one complete revolution in both direction
while applying load with a large screwdriver between
the carrier casting and differential case flange.
Refer Fig. 71
A.
Normal or desirable pattern. The drive pat-
tern should be centered on the tooth.The coast
pattern should also be centered on the tooth,
but may be slightly toward the toe. There
should be some clearance between the pattern
and the top of the tooth.
B.
Backlash correct. Thinner pinion position shim
required.
C.
Backlash correct. Thicker pinion position shim
required.
D.
Pinion position shim correct Decrease
backlash.
E.
Pinion position shim correct. Increase
backlash.
Pattern movements summary
l
Decreasing backlash moves the ring gear
closer to the pinion.
Drive pattern (convex side of gear) moves
slightly lower and toward the toe.
Coast pattern (concave side of gear) moves
lower and toward the toe.
l
Increasing backlash moves the ring gear away
from the pinion.
Drive pattern moves slightly higher and
toward the heel.
Coast pattern moves higher and toward the
heel.
l
Thicker pinion position shim with the backlash
constant moves the pinion closer to the ring
gear.
Drive pattern moves deeper on the tooth and
slightly toward the toe.
Fig. 71
Coast pattern moves deeper on the tooth and
slightly toward the heel.
l
Thinner pinion position shim with the backlash
constant moves the pinion farther from the
ring gear.
Drive pattern moves toward the top of the
tooth (face contact) and toward the heel.
Coast pattern moves toward the top of the
tooth and slightly toward the toe.