5.
When reading the dial
indicator, rotate the crown
gear a small amount in
both directions against the
teeth of the drive pinion
(
Figure 8-93
). If the
backlash reading is not
within specification
(typically ranging from
0.010 to 0.020 inch),
adjust backlash as
outlined in Steps 6 and 7.
6.
Loosen one bearing
adjusting ring one notch,
and then tighten the
opposite ring the same
amount. Backlash is
increased by moving the
crown gear away from the
drive pinion (
Figure 8-94
).
Backlash is decreased by
moving the crown gear
toward the drive pinion
(
Figure 8-95
).
7.
Repeat steps 1 thru 5 until
the backlash is within
specifications.
Pinion and Crown Tooth
Contact Adjustment
Figure 8-93 - Check crown gear backlash.
Correct tooth contact between
the pinion and crown gear cannot
be overemphasized because
improper tooth contact results in
noisy operation and premature
failure. The tooth contact pattern
consists of the lengthwise
bearing (along the tooth of the
ring gear) and the profile bearing
(up and down the tooth).
Figure
8-96
shows crown gear tooth
nomenclature.
Figure 8-94 - Adjustments to increase
backlash.
NAVEDTRA 14050A
8-88