TM-9-2320-272-23-3

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 3 OF 5

SEPTEMBER 2012
TM-9-2320-272-23-3

  TM-9-2320-272-23-3 - Page 1043 of 1469

INSTALLATION
NOTE
Ensure double-lip seal is placed outward.
1.
Using long end of seal inserter, install air seal (Figure 5, Item 2) on hub (Figure 5, Item 3), with spring facing
out, until seated in hub.
2.
Using short end of seal inserter, install air seal (Figure 5, Item 2) on hub (Figure 5, Item 3), with spring facing
inward, until seated in hub.
3.
Install snapring (Figure 5, Item 1) on hub (Figure 5, Item 3).
CAUTION
Ensure bearings are matched with bearing cups before installation, or damage to bearings
may result.
NOTE
•
Pack inner and outer bearings with automotive and artillery grease prior to installation.
•
Pack inner rubber section of hub seal with automotive and artillery grease.
4.
Install inner bearing (Figure 5, Item 14) and oil seal (Figure 5, Item 4) on hub (Figure 5, Item 3).
CAUTION
Do not allow hub assembly to slide directly over threaded end of spindle. Damage to air seals
may result.
NOTE
Assistant will help with Step (5).
5.
Install hub (Figure 5, Item 3), outer bearing (Figure 5, Item 13), and bearing adjusting nut (Figure 5, Item 12)
on spindle (Figure 5, Item 5).
6.
While rotating hub (Figure 5, Item 3), tighten bearing adjusting nut (Figure 5, Item 12) 50 lb-ft (68 N·m).
7.
Back out bearing adjusting nut (Figure 5, Item 12) 1/8 to 1/4 turn so washer (Figure 5, Item 11) can be aligned
with slot on spindle (Figure 5, Item 5) and locking pin on adjusting nut.
8.
Install washer (Figure 5, Item 11) and outer bearing nut (Figure 5, Item 10) on spindle (Figure 5, Item 5). Tighten
outer bearing nut 250 to 400 lb-ft (339 to 542 N·m).
9.
Apply silicone rubber adhesive to mating surface of hub (Figure 5, Item 3) and inside of flange on axle shaft
(Figure 5, Item 6).
10.
Install axle shaft (Figure 5, Item 6) on hub (Figure 5, Item 3) with ten lockwashers (Figure 5, Item 7) and screws
(Figure 5, Item 8). Tighten screws 60 to 100 lb-ft (81 to 136 N·m).
11.
Install brake drum (Figure 5, Item 9) on hub (Figure 5, Item 3).
TM 9-2320-272-23-3
0482
0482-10


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