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 584 of 836
TM
9-2320-272-24-4
5-92. ELECTRIC HEATER (10 KW) WIRING HARNESS REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
M934/A1/A2
TM 9-2320-272-10
TOOLS
TM 9-2320-272-24P
General mechanic’s tool kit (Appendix E, Item 1)
EQUIPMENT CONDITION
Electrical tool kit (Appendix E, Item 40)
l
Parking brake set (TM 9-2320-272-10).
l
Battery ground cables disconnected (para. 3-126).
l
Ceiling filter and side panels removed (para. 5-79).
a. Removal
NOTE
Tag wires for installation.
1.
Remove twelve screws (28) and clamps (27) from van ceiling (25) and wiring harness (26).
2.
Remove grommet (24) from van ceiling (25) and wiring harness (26).
3.
Remove wires (29) and (23) from heater (30).
4.
Remove thermostat cover (4) from thermostat (5).
5.
Remove two screws (3) and thermostat (5) from upper cover (7).
6.
Remove three insulated wire splicers (6) from wiring harness (8) and thermostat leads (2). Discard
insulated wire splicers (6).
7.
Remove four screws (1) and upper cover (7) from control center box (10).
8.
Remove six screws (22) and cover (11) from load center (15).
9.
Remove screw (12), clamp (13), and wiring harnesses (21) and (8) from load center (15).
10.
Remove screw (20) and wire (19) from neutral bus (14).
11.
Remove three screws (17) and wires (18) from 20 amp circuit breakers (16).
12.
Remove wiring harness (8) from van body (9).
b. Installation
1.
Position wiring harness (8) on van body (9).
2.
Install three wires (18) on 20 amp circuit breakers (16) with three screws (17).
3.
Install wire (19) on neutral bus (14) with screw (20).
4.
Install clamp (13) on wiring harnesses (8) and (21) and load center (15) with screw (12).
5.
Install cover (11) on load center (15) with six screws (22).
6.
Install upper cover (7) on control center box (10) with four screws (1).
7.
Connect thermostat leads (2) to wiring harness (8) with three new insulated wire splicers (6).
8.
Install thermostat (5) on upper cover (7) with two screws (3).
9.
Install thermostat cover (4) on thermostat (5).
10.
Install wires (23) and (29) on heater (30).
5-578
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