Dodge MRC-TC06NC Manual de instrucciones - Página 3
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MODIFIED ASSEMBLY PROCEDURE
SCXT325A MIMA/ITW (WRAPPER UNITS)
1.
1. All assembly procedures for standard SCXT325A should
be followed except for the following changes in shimming
of output bearing.
2.
2. New output bearing shimming procedures:
a.
Place output bearing cup in left half of housing. Ensure
the bearing cup is correctly seated.
b.
Position output hub seal carrier (without shims) and
install two carrier screws diametrically opposed.
c.
Torque each screw to 50 lb.-in. Rotate the output hub
to roll in the bearings, then torque each screw to
100 lb.-in. Rotate the output hub again to roll in the
bearings.
d.
Seat output bearings by tapping the seal carrier with
a hammer; turning the output hub through 360 degrees
to further roll in the bearings. Torque carrier bolts
again to 100 lb.-in. Repeat this process of hammering,
turning the output hub, and torquing to 100 lb.-in. until
bearings are completely seated (3-4 seatings may be
required).
e.
With a feeler or taper gauge, measure the gap between
the housing and the carrier, clockwise from and next to
each screw.
f.
To determine the required shim pack thickness,
subtract .005 in. from the average of the two gauge
readings (Pack Thickness = Gauge Average – .005 in.).
g.
Remove the output hub seal carrier and install the
required shims (shim pack thickness should be
inspected with a 0-1" micrometer).
Note: Total shim thickness per carrier should not
include more than .009" plastic shims. All other
shims should be metal, and each plastic shim
should be inserted between two metal shims.
h.
Continue with normal assembly procedure from this
point. (Carrier bolt torque should be 204 lb.-in.)
3.
Place countershaft bearing carrier in position without
shims and install two carrier screws diametrically opposed.
Torque each screw to 25 lb.-ins. Rotate the output hub to
roll in the bearings and then torque each screw once to 50
lb.-ins. Do not retorque screws. Again turn countershaft to
roll in the bearings. With a feeler or taper gauge, measure
the gap between the housing and the carrier, clockwise
from and next to each screw. To determine the required
shim thickness, take the average of the two feeler gauge
readings. Remove carrier and install the required shims.
Note: Total shim thickness per carrier should not include
more than .009" plastic shims, and each plastic shim
should be inserted between two metal shims. Place a
diameter bead of Dow Corning RTV732 sealant on the face
around the I.D. of the end shim (sealant is to be between
reducer housing and shim) and install carrier on reducer
housing. Torque carrier bolts to 204 lb-ins. Countershaft
should have an axial end play of .001" to .003".
4.
Using the same procedure as in step 3 adjust the input shaft
bearings, except the axial end play should be .002" to .003".
Torque bearing carrier to 204 lb-ins.
Table 5 — Manufacturers' Part Numbers For Replacement
Output Shaft Bearings
TORQUE-ARM Reducer
Drive Size
SCXT3A
Table 6 — Manufacturers' Part Numbers For Replacement
Countershaft Bearings
Countershaft Bearing Input
TORQUE-ARM
Side
Dodge
Size
Part No.
402273
SCXT3A
403094
Table 7 - Manufactures' Part Numbers For Replacement Input Shaft Bearings
Input Bearing
TORQUE-ARM
Input Side
Dodge
Size
Part No.
402204
SCXT3A
403139
3
Output Hub Bearing
DODGE
Manufacturer's Part
Part Number
Number
402272
LM814849
403127
LM814810
Countershaft Bearing Adapter
Side
Manufacturer's
Dodge
Manufacturer's
Part Number
Part No.
Part Number
15102
402273
15245
403094
Input Bearing
Adapter Side
Manufacturer's
Dodge
Manufacturer's
Part Number
Part No.
Part Number
LM48548A
402273
LM48510
403094
15012
15245
15102
15245