TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 568 of 1015
3-70. FAN
TM 9-2320-272-24-1
THIS TASK COVERS:
a. Adjustment
c. Inspection
b. Removal
d. Installation
APPLICABLE MODELS
M939/A1
TOOLS
REFERENCES (TM
TM
9-2320-272-10
TM
9-2320-272-24P
General mechanic’s tool kit (Appendix E, Item 1)
Belt tension gauge (Appendix E, Item 16)
Torque wrench (Appendix E, Item 146)
MATERIALS/PARTS
EQUIPMENT CONDITION
Cap and plug set (Appendix C, Item 14)
Antiseize tape (Appendix C, Item 72)
Parking brake set (TM 9-2320-272-10).
Hood raised and secured (TM 9-2320-272-10).
Air reservoirs drained (TM 9-2320-272-10).
Right splash shield removed (TM 9-2320-272-10).
GENERAL SAFETY INSTRUCTIONS
Do not disconnect air lines or hoses before draining
air reservoirs.
1.
2.
3.
4.
5.
6.
Disconnect air line (7) from elbow (8).
Remove elbow (8) and adapter (9) from union (10).
Loosen three screws (1) on fan pulley bracket (6).
Loosen jamnut (2) on adjusting screw (3) on water pump clamp ring (4).
Using belt tension gauge on inner belt midway between pulleys, adjust tension of inner belt (5) by
turning screw (3). Tension should be 95-105 lb-ft (423-467 N•m) for a new belt (5) and 85-95 lb-ft
(378-422 N•m) for a used belt (5).
Repeat tension check of step 5 for outer belt (5). Recheck inner belt (5).
NOTE
7.
8.
Belts must be replaced as a matched set.
If either inner or outer belts (5) cannot be adjusted in proper range, replace both belts (5).
Tighten top screw (1) 25-35 lb-ft (34-47 N•m). Tighten two side screws (1) 25-35 lb-ft (34-47 N•m).
NOTE
Male pipe threads must be wrapped with antiseize tape before
installation.
9.
Install adapter (9) and elbow (8) on union (10).
10.
Connect air line (7) to elbow (8).
Do not disconnect air lines or hoses before draining air reservoirs.
Small parts under pressure may shoot out with high velocity,
causing injury to personnel.
1.
Disconnect air line (7) from elbow (8).
2.
Remove elbow (8) and adapter (9) from union (10).
3.
Loosen three screws (1) on bracket (6).
3-204
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