Gear Pattern Movement Summary; 4Wd Rear Axle - Toro Reelmaster 5200-D Service Manual

Every gear has a characteristic pattern. The illustrations
show typical patterns only and explain how patterns shift
as gear location is changed. When making pinion posi-
tion changes, shims should be changed in the range of
.002 inch to .004 inch until a correct pattern has been ob-
tained.
When a change in backlash is required, backlash shims
should be changed in the range of 1-1/2 times the
amount of backlash required to bring the gears into
specification. For example, if the backlash needed to be
changed by .004 inch, the shim pack should be changed
by .006 inch as a starting point.
High backlash is corrected by moving the ring gear clos-
er to the pinion. Low backlash is corrected by moving the
ring gear away from the pinion. These corrections are
made by switching shims from one side of the differential
case to the other.
Example 1: Backlash correct. Thicker pinion position
shims required (Fig. 16).
Example 2: Backlash correct. Thinner pinion position
shims required (Fig. 17).
Example 3: Backlash incorrect. Thinner pinion position
shim required. Adjust backlash to match (Fig. 18).

Gear Pattern Movement Summary

A. Decreasing backlash moves the ring gear closer
to the pinion.
Drive pattern (convex side of gear) moves lower
and toward toe.
Coast pattern (concave side of gear) moves slight-
ly higher and toward heel.
B. Increasing backlash moves the ring gear away
from the pinion.
Drive pattern (convex side of gear) moves higher
and toward heel.
Coast pattern (concave side of gear) moves slight-
ly lower and toward toe.
C. Thicker pinion position shim with the backlash
constant moves the pinion closer to the ring gear.
Coast pattern (concave side of gear) moves deep-
er on the tooth and toward heel.

4WD Rear Axle

(Unit Serial No. 80001 - 99999)
D. Thinner pinion position shim with backlash
constant moves the pinion further from the ring gear.
Drive pattern (convex side of gear) moves toward
the top of the tooth (face contact) and toward heel.
Coast pattern (concave side of gear) moves to-
ward the top of the tooth (face contact) and toward
heel.
Drive pattern (convex side of gear) moves deeper
on the tooth (flank contact) and slightly toward toe.
DRIVE SIDE
Heel
DRIVE SIDE
Heel
DRIVE SIDE
Heel
Page 9 - 14
Rev. A
COAST SIDE
Toe Toe
Figure 16
COAST SIDE
Toe Toe
Figure 17
COAST SIDE
Toe Toe
Figure 18
Reelmaster 5200-D/5400-D
Heel
Heel
Heel