TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
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TM 9-2350-311 -20-1 8-33 CIRCUIT BREAKERS (M109A2/M109A3) This task covers: a. Removal b. Installation Applicable Conditions . . M109A2/M109A3 Tools General mechanic’s tool kit (item 64, Appx H) Material/Parts Lockwashers (14) (item 85, Appx G) Lockwashers (2) (item 95, Appx G) Equipment Condition Portable and driver's instrument panels removed (para 8-17) a. Removal Ensure MASTER switch is OFF when working on hull electrical systems to avoid electrical shock and burns. NOTE Wiring of circuit breakers differs between M109A2/M109A3 Howitzers. 1 Identify and tag 14 electrical leads (1). 2 Remove two screws (2), two flat washers (3), and two Iockwashers (4). Discard Iockwashers. 3 Remove circuit breaker panel (5). 4 To remove individual circuits, first identify problem circuit. Refer to wiring diagrams in Section Ill, this chapter and Appendix 1. 5 Disconnect identified 14 electrical leads(1) at circuit breaker (6). 6 Remove two screws (7), two flat washers (8), two Iockwashers (9), and two nuts (10) at identified problem circuit breaker (6). Discard Iockwashers. 7 Remove circuit breaker (6). 6-86 WARNING