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 396 of 991

TM 9-2320-272-24-2

3-407. SWINGFIRE HEATER ELECTRICAL COMPONENTS REPLACEMENT

THIS TASK COVERS:

a. Electrical Connector Removal

b. Relay Removal

c. Circuit Breaker Removal

d. Thermal Switch Removal

e. Thermal Switch Installation

f. Circuit Breaker Installation

g. Relay Installation

h. Electrical Connector Installation

INITIAL SETUP:

APPLICABLE MODELS

All

REFERENCES (TM)

TM 9-2320-272-10

TM 9-2320-272-24P

TOOLS

General mechanic’s tool kit (Appendix E, Item 1)

EQUIPMEMT CONDITION

MATERIALS/PARTS

l

Parking brake set (TM 9-2320-272-10).

l

Battery ground cables disconnected (para. 3-126).

Lockwasher (Appendix D, Item 375)

Locknut (Appendix D, Item 291)

Three locknuts (Appendix D, Item 313)

Two locknuts (Appendix D, Item 276)

Antiseize compound (Appendix C, Item 62)

a. Electrical Connector Removal

1.

Loosen screw (10) and remove wire (9) from electrical connector (11).

2.

Remove nut (13), lockwasher (12), and electrical connector (11) from cab panel (14). Discard

lockwasher (12).

b. Relay Removal

NOTE

Tag all wires for installation.

1.

Remove four screws (8), clips (15), and wires (2) from relay (3) between dash panel (1) and

firewall (6).

2.

Remove two locknuts (4), screws (7), and relay (3) from bracket (5). Discard locknuts (4).

3-1004