TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 507 of 1258
9-5.
DIFFERENTIAL REPLACEMENT (Cont'd)
b. Installation
NOT E
• New configuration (P/N 12338415-3) differentials are provided with a
pinion yoke and slinger installed. Four O-rings and three locknuts
are also provided, but not installed. Output flanges are not provided.
• No modification to service differential is required when replacing
rear differential on vehicles with serial numbers USBL Eff. 44825
and above.
• If service differential is replacing a front differential, the service yoke
must be replaced and the slinger removed.
• If service differential is replacing a rear differential on vehicles with
serial numbers USBL Eff. 44825 and below, the service yoke must be
replaced with a flange.
• Perform step 1 for front and rear differential installation.
1.
Measure torque required to rotate pinion yoke (3) on service differential (1) and record.
NOT E
Perform steps 2 through 5 for front differential only.
2.
If necessary, remove locknut (4) and pinion yoke (3) from old differential (1). Discard locknut (4).
3.
Remove locknut (4) and pinion yoke (3) from service differential (1). Remove slinger (2). Discard
locknut (4).
4.
Install new pinion yoke (3) and locknut (4) on service differential (1).
5.
Tighten locknut (4) in small increments, until torque required to rotate pinion yoke (3) exceeds
original measurement (step 1) by 2 lb-in. (0.2 N
•
m).
6.
For rear differentials, apply sealing compound to differential (1) tapped holes. Install two brake
caliper adapters (16) on differential (1) with four capscrews (15). Tighten capscrews (15) to 110-140
lb-ft (149-190 N
•
m).
7.
If removed, installation of new configuration side mounting brackets (6) is recommended, refer
to (para. 12-16).
8.
Raise differential (1) into place and connect vent line (17).
CAUTION
Apply a liberal amount of thread sealing compound to the tapped
holes of differential. To allow adequate coating of threads, install
capscrews shortly after applying thread sealing compound. Failure to
do this could allow capscrews to loosen and cause damage to
d±i±f±f±e±r±e±n±t±i±a±l±
.
9.
Apply sealing compound to differential (1) tapped holes. Install capscrews (8), washers (7), and
differential (1) on side mounting brackets (6).
NOT E
Perform step 10 if replacing front differential.
10.
Install mounting bracket (9) on frame crossmember (24) with two washers (23), capscrews (22),
washers (23), and locknuts (25). Tighten locknuts (25) to 90 lb-ft (122 N
•
m).
NOT E
Washers are not required when securing front differential to mounting
bracket.
11.
Apply sealing compound to capscrews (11). Install two capscrews (11), washers (10), and differ-
ential (1) on mounting bracket (9).
TM 9-2320-280-34
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Change 1
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