TM-9-2320-272-24-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4
JUNE 1998
TM-9-2320-272-24-2 - Page 48 of 991
TM 9-2320-272-24-2
3-230. STEERING PUMP DRIVEBELTS (M939/A1) MAINTENANCE
THIS TASK COVERS:
a. Adjustment
c. Inspection
b. Removal
d. Installation
INITIAL SETUP:
APPLICABLE MODELS
M939/Al
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
SPECIAL TOOLS
Belt tension gauge (Appendix D, Item 16)
EQUIPMENT CONDITION
320-272-10).
TOOLS
Parking brake set (TM 9-2
General mechanic’s tool kit (Appendix E, Item 1)
Left splash shield removed (TM 9-2320-272-10).
Fan drivebelts removed (para. 3-70)
Torque wrench (Appendix E, Item 144)
Prybar
1.
Loosen screw (6) and nut (5) from pump adjusting link (4) and pump bracket (7).
2.
Loosen two screws (1) from pump bracket (7) and mounting bracket (10).
3.
Place prybar beneath steering pump (2) so end rests on engine (9).
4.
Using engine (9) for leverage, push prybar upward until drivebelts (11) appear tight.
5.
Tighten screw (6) and nut (5).
6.
Tighten two screws (1) 30-40 lb-ft (41-54 N•m).
NOTE
If belt tension cannot be properly adjusted, replace drivebelts.
7.
Position belt tension gauge on drivebelt (11) between pump pulley (3) and accessory drive
pulley (8).
a. New belt (12) tension should be 95-105 lb (418-462 N•m).
b. Used belt (12) tension should be 85-95 lb (378-422 N•m).
1.
Loosen nut (5) on pump adjusting link (4) and pump bracket (7).
2.
Loosen two screws (1) on pump bracket (7) and mounting bracket (10).
3.
While pushing downward on power steering pump (2), remove two drivebelts (11).
NOTE
Pump drivebelts must be replaced in matched sets.
Inspect two pump drivebelts (11) for cracks, splits, breaks, and wear. Replace both drivebelts (11) if
either is cracked, split, broken, or worn.
3-656
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