
Copyright Meritor, Inc., 2020
MM-0861 / Revised July 2020
Page 68
Printed in USA
6
Assembly
Shim Assembly
In order to adjust the end play on any shaft, it is necessary to split the
transfer case.
NOTE:
The exception is the input shaft which can have the horseshoe
-style shims removed or added by loosening or removing the input
bearing cage capscrews.
1. Rotate the transfer case in the stand with the rear cover facing UP.
Remove the case-to-cover capscrews.
2. Use a suitable lift to remove the rear cover. Mount the cover so
the pressed-in bearing cups can be removed.
3. Use a bearing puller to remove the bearing cups from the cover.
Shims are placed between the cover and the cup. Refer to
“Remove the Bearing Cups” on page 49.
4. Select the correct shim or shims to achieve the correct end play.
If the end play measurement is below 0.002” (0.051 mm), which
indicates a pre-loaded shaft, start by removing shims until some
measurable end play is observed.
TABLE A: EXAMPLE OF SHIM SELECTION
Initial measurement
(idler shaft)
0.018”
0.46 mm
Specifi cation
0.002” - 0.006”
0.051 - 0.152 mm
Required shim stack
0.016-0.012”
0.406-0.305 mm
TABLE B: POSSIBLE SHIM STACK COMBINATIONS
2 (0.005)
1 (0.003)
0.013”
1 (0.010)
1 (0.005)
0.015”
1 (0.010)
2 (0.003)
0.016”
2 (0.13 mm)
1 (0.08 mm)
0.34 mm
1 (0.25 mm)
1 (0.13 mm)
0.38 mm
1 (0.25 mm)
2 (0.08 mm)
0.41 mm
5. After selecting the correct shim combination, place the shims
in the bottom of the bearing bore. Refer to the exploded views
starting on page 1 in this manual.
6. Press the bearing cup into the bore until it is completely seated.
The shims must be centered in the bore while pressing in the
bearing cup.
NOTE:
On MTC-4208 and MTC-4210 models, shims are installed
between the bearing cups and housing bore on the rear cover,
except at the input shaft position. The shims for input shaft are
installed between the input cage and front cover.
On MTC-4213 models, the front input shaft is shimmed between
the input cage and front case half. The rear output shaft is
shimmed between the two tapered bearing set. All others shafts
are shimmed between the bearing cup and housing bore on the
rear case cover.
7. Repeat Step 3 through Step 6 for each bearing needing an end
play adjustment.
NOTE:
Before fi nal assembly, verify each shim selection
procedure results in the correct end play specifi cation. Repeat the
end play measurement steps, as necessary, to obtain the correct
end play specifi cation on all shafts.
8. Reassemble the cover to the case. Install all 29 case-to-cover
capscrews and fl at washers. Tighten the capscrews to 60-75 lb-ft
(81-102 N∙m).
9. Recheck the end play. Once the measurements are correct,
remove the cover and prepare for fi nal assembly.
Содержание MTC-4208X Series
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