TM-9-2320-272-24-4
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4
JUNE 1998
TM-9-2320-272-24-4 - Page 326 of 836
TM 9-2320-272-24-4
5-46. TRANSMISSION OIL PUMP AND FRONT SUPPORT MAINTENANCE (Contd)
1.
2.
3.
4.
5.
6.
7.
8.
CAUTION
Identify transmission model before assembly of oil pump and front
support. If early model converter hub was replaced with late
model converter hub, a late model oil pump and front support
must be installed, or transmission may be damaged during
assembly (para. 5-39).
NOTE
Late model oil pump is thicker than early model oil pump.
Late model front support has a bushing and a thicker seal in oil
pump hub. Early model oil pump hub has a thin seal and the
torque converter hub has a roller bearing.
Install bearing and race (2) on turbine shaft (3).
NOTE
Guide pins maintain gasket alignment.
Install two guide pins (5) and new oil pump gasket (1) into transmission (4).
Apply oil-soluble grease sparingly to two new seal rings (10) to hold in place, and install seal
rings (10) on hub (9) of oil pump (7) and front support (8).
Apply oil-soluble grease to new oil pump and ring coil, and install new oil pump seal ring (6) on oil
pump (7) and front support (8).
Attach front support lifter to converter ground sleeve (12).
Align front support holes (13) with corresponding holes in transmission (4), and carefully install
front support (8) in transmission (4) over guide pins (5).
Remove two guide pins (5) and front support lifter from transmission (4).
Install front support (8) on transmission (4) with twelve new rubber-covered washers (14) and
screws (11). Tighten screws (11) as follows:
a.
Tighten alternately 180° apart. Tighten screws (11) 15 lb-ft (20 N•m).
b.
Repeat tightening sequence 180° apart to achieve final torque. Tighten screws (11) 24-32 lb-ft
(33-43 N•m).
5-320
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