Meritor MTC-4208X Series, Service Manual, Page: 69 / 120

Copyright Meritor, Inc., 2020 Printed in USA
MM-0861 / Revised July 2020
Page 65
6 Assembly
7. Adjust the shims to achieve the correct bearing end play on all
shafts as required and recheck.
8. Before installing the yoke, clean the splines of old silastic. Apply
a 1/8” (3.175 mm) bead of RTV 732 sealant 360 degrees around
the underside of the washer. Figure 6.25.
Figure 6.25
4005171a
Apply 1/8" (3.175 mm)
bead of sealant to
underside of washer
(all yoke splines)
Idler Shaft (Single or Double) Bearing End Play
(All Models)
Determine the shaft bearing end play before fi nal assembly. The
MTC-4213X has both single idler and doubler idler gear shafts while
all other models have a double idler gear shaft. Seals should not be
installed until the end plays are set.
1. Rotate the transfer case with the front of the case facing
UPWARD.
2. Remove the 3/8” (9.5 mm) pipe plugs at the shaft locations on
the front of the case.
3. To prepare to check shaft bearing end play, insert a 1/2”-13 bolt
into the shaft through the pipe plug hole, until the bolt is fully
seated. The bolt should extend out of the transfer case enough to
be used to lift the idler shaft.
4. Tighten the bolt until it bottoms in the shaft for an accurate end
play measurement.
5. Rotate the idler shaft several times to help seat the bearing cones.
6. Set up the dial indicator to check the idler shaft bearing end play.
Center the dial indicator on the bolt head. Zero the indicator.
Figure 6.26.
Figure 6.26
4000208a
7. Use pry bars to lift up on the bolt head to obtain a measurement.
To obtain a consistent and averaged reading, perform this
operation two or three times. Record the reading for this shaft.
The specifi cation is 0.002-0.006” (0.051-0.152 mm).
• If the end play is greater than 0.006” (0.152 mm):
Add shims to reduce end play.
• If the end play is less than 0.002” (0.051 mm):
Remove shims to increase end play. Bearing shims come
in 0.003”, 0.005”, and 0.010” (0.08, 0.13, and 0.25 mm)
thicknesses.