JLG 26MRT ANSI Service Manual - Manual (Page 34)

SECTION 2 - PROCEDURES
2-22 – JLG Sizzor – 3120791
changes, shims should be changed in the range of 0.002
inches (0.051 mm) to 0.004 inches (0.102 mm) until the
correct pattern has been obtained.
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 needs to be changed by
0.004 inches (0.102 mm), the shim pack should be
changed by 0.006 inches (0.152 mm) as a starting point.
The actual amount of backlash change obtained will vary
depending upon the ratio and gear size.
High backlash is corrected by moving the ring gear closer
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.
NOTE: When making changes, note that two variables are
involved. Example: If you have the backlash set cor-
rectly to specifications and you change the pinion
position shim, you may have to readjust the backlash
to correct specification before checking the pattern.
GEAR TEETH MAY HAVE SHARP EDGES. WHEN HANDLING
GEARS, USE CAUTION TO AVOID PERSONAL INJURY.
Figure 2-18. Ring Gear and Pinion Tooth
Contact Pattern