JLG G6-42P Service Manual - Manual (Page 342)

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Section 5
Adjustments
Deep Contact Pattern
A deep contact pattern indicates that the drive pinion
was installed too far in the carrier.
Figure 5.11.
• To correct a deep contact pattern, increase
thickness of shim pack under bearing cage. This
will move the drive pinion away from the ring gear.
Figure 5.12.
Variations Along Length of
Gear Teeth
Adjust backlash of ring gear within specification
range to move contact patterns to correct location
along length of gear teeth.When toe contact pattern
indicates that backlash is very low and gear is too
close to drive pinion: Figure 5.13.
•
Withdraw ring gear by decreasing shim pack
thickness or loosening the gear side adjusting ring
and tightening opposite side adjusting ring.
When heel contact pattern indicates that backlash
is very high and gear is too far away from drive
pinion: Figure 5.14.
•
Approach ring gear by increasing shim pack
thickness or loosening gear opposite side
adjusting ring and tightening gear side
adjusting ring.
Figure 5.11
Figure 5.12
Figure 5.13
Figure 5.14
INCREASE SHIM
PACK THICKNESS