TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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9-5. DIFFERENTIAL REPLACEMENT (Cont'd) b. Installation NOTE • 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. NOTE 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 differential. 9. Apply sealing compound to differential (1) tapped holes. Install capscrews (8), washers (7), and differential (1) on side mounting brackets (6). NOTE 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). NOTE 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 9-8 Change 1