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 718 of 991
TM 9-2320-272-24-2
4-4. POWER PLANT (M939/A1) REPLACEMENT (Contd)
INITIAL SETUP (COND):
EQUIPMENT CONDITION
Parking brake set (TM 9-2320-272-10).
Lifting device must have a capacity greater than
Battery ground cables disconnected
the combined weight of the engine and
(para. 3-126).
transmission.
Air reservoirs drained (TM 9-2320-272-10).
Engine oil drained (para. 3-5).
Transmission oil drained (para. 3-133).
Hood removed (para. 3-275).
Radiator drained and removed (para. 3-59).
Coolant hoses and tubes removed
(para. 3-54).
Front exhaust pipe removed (para. 3-50).
Engine oil dipstick and tube removed (para.
3-3).
Air intake pipe and hump hoses removed
(para. 3-14).
Transmission PTO-to-hydraulic pump drive
shaft removed, if equipped (para. 3-334).
Transmission-to-transfer case propeller shaft
removed (para. 3-148).
Surge tank removed (3-61).
Radiator fan blade assembly removed
(para. 3-72).
All personnel must stand clear during lifting
operations.
Do not put hands between frame and engine
supports during lifting operations.
Do not detach chain from engine until engine is
supported.
Engine must be securely mounted on repair stand.
Never start a new or repaired engine without
performing run-in starting procedures (para. 4-8).
GENERAL SAFETY INSTRUCTIONS
a. Preliminary Disconnections
NOTE
If a special purpose kit is installed on vehicle, refer to
chapter 4, section XV, and make necessary disconnections.
1.
Disconnect wires (3) and (2) from water temperature sending unit (4) and engine high temperature
sending unit (1).
2.
Remove hose clamp (8) and hose (6) from water heater shutoff (7). Tie hose (6) clear of engine (5).
3.
Remove hose clamp (10) and hose (9) from water heater shutoff (11). Tie hose (9) clear of engine (5).
4.
Remove two screw-assembled lockwashers (27) and terminal cover (26) from alternator (28). Discard
screw-assembled lockwashers (27).
5.
Remove two screws (21), lockwashers (20), and retainer (19) from alternator (28). Discard
lockwashers (20).
6.
Remove screw (14), lockwasher (13), and wire (12) from alternator (28). Discard lockwasher (13).
4-36
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