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 733 of 1275

TM 9-2350-311-20-1

8-34 CIRCUIT BREAKERS (M109A4/M109A5)

This task covers:

a. Removal

b. Installation

Applicable Conditions

.

.

M1 09A4/M109A5

Tools

General mechanic’s tool kit (item 64, Appx H)

Materials/Parts

Lockwashers(16) (item 85, Appx G)

Lockwashers (2) (item 95, Appx G)

. .

Equipment Conditions

Portable and driver's instrument panels removed

(para 8-17)

a. Removal

1

2

3

4

5

6

7

Ensure

MASTER

switch is

OFF

when working on hull electrical systems to avoid

electrical shock and bums.

Identify and tag 16 electrical leads (1).

Remove two screws (2), two flat washers (3), and two Iockwashers (4). Discard Iockwashers.

Remove circuit breaker panel (5).

To remove individual circuits, first identify problem circuit. See wiring diagrams in Section Ill, this chapter and

Appendix 1.

Disconnect 16 identified electrical leads (1) at circuit breaker (6).

Remove two screws (7), two flat washers (8), two Iockwashers (9), and two nuts (1 O) at identified problem

circuit breaker (6). Discard Iockwashers.

Remove circuit breaker (6).

b. Installation

Ensure MASTER switch is OFF when working on hull electrical systems to avoid

electrical shock and bums.

1 Install circuit breaker (6), two flat washers (8), two new Iockwashers (9), two screws (7), and two nuts (10).

WARNING

8-88