Check The Tooth Contact Patterns (Backlash) Of The Gear Set - Meritor MS-113 Maintenance Manual

Section 4
Assembly and Installation
NOTE: When you adjust backlash, only move the
ring gear. Do not move the drive pinion.
6. Repeat Steps 2-5 until the backlash is within
specifications.
Check the Tooth Contact Patterns
(Backlash) of the Gear Set
In the following procedures, movement of the
contact pattern in the length of the tooth is
indicated as toward the heel or toe of the ring
gear. Figure 4.22.
Always check tooth contact patterns on the drive
side of the gear teeth. Figure 4.23.
Figure 4.22
1
1 HEEL
2 TOE
Figure 4.23
1
1 DRIVE SIDE (CONVEX)
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Copyright 2002
ArvinMeritor, Inc.
1. Adjust the backlash of a new gear set to
0.005-0.015-inch (0.13-0.38 mm). Adjust the
backlash of an old gear set to the setting that
you measured before the carrier was
disassembled. Refer to Ring Gear Backlash in
this section.
2. Apply a marking compound onto
approximately 12 gear teeth of the ring gear.
Rotate the ring gear so that the 12 gear teeth
are next to the drive pinion. Figure 4.24.
Figure 4.24
3. Rotate the ring gear forward and backward so
that the 12 gear teeth go past the drive pinion
six times to get the contact patterns. Repeat if
needed to get a clearer pattern.
4. Look at the contact patterns on the ring gear
teeth. Compare the patterns to Figures 4.25,
4.26 and 4.27.
The location of good hand-rolled contact
patterns for new gear sets is toward the toe
of the gear tooth and in the center between
the top and bottom of the tooth. Figure 4.25.
When the carrier is operated, a good pattern
will extend approximately the full length of
the gear tooth. The top of the pattern will be
near the top of the gear tooth. Figure 4.28.
The location of a good hand-rolled contact
pattern for an old gear set must match the
wear pattern in the ring gear. The new
contact pattern will be smaller in area than
the old wear pattern.
Maintenance Manual MM-0230
Issued 07-02