TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 731 of 1275

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