JLG 26MRT, Service & Maintenance

Page: 35 / 62

SECTION 2 - PROCEDURES
3120791 – JLG Sizzor – 2-23
Check the ring gear and pinion tooth pattern as fol-
lows:
• Paint the ring gear teeth with a marking compound to
both the drive and coast side.
• Rotate the ring gear one complete revolution in both
directions while a load is being applied with a large
screwdriver or similar tool between the carrier housing
and the differential case flange.
• Inspect the ring gear for wear patterns as outlined in
Figure 2-19., Ring Gear Pattern Interpretation. Make
any necessary adjustments with the following informa-
tion in mind.
• 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.
• 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.
• Thicker pinion position shim with the backlash con-
stant moves the pinion closer to the ring gear.
Drive pattern moves deeper on the tooth (flank contact)
and slightly toward the toe.
Coast pattern moves deeper on the tooth and toward the
heel.
• Thinner pinion position shim with the backlash con-
stant moves the pinion further 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.
2.16 BRAKE REPAIR
Disassembly
1. With the brake mounted in a suitable holding fixture,
remove the two socket head assembly bolts.
Figure 2-19. Ring Gear Pattern Interpretation