TM-9-2350-311-20-2

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

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS

DECEMBER 1993

TM-9-2350-311-20-2 - Page 508 of 828

TM 9–2350–311–20–2

9–6

9–2

CONTACT BOARD SEGMENTS FOR 3 CONTACT ARM ASSEMBLIES — CONTINUED

a.

Removal

WARNING

While performing all procedures in this section except for testing, disconnect the battery ground ca-

ble at battery terminal to cut off cab electrical power. Failure to observe this warning could result in

severe burns and electrical shock, resulting in injury or death.

NOTE

This procedure is written for one contact arm assembly, but applies to all three.

1

Remove six cap screws (1), six flat washers (2), and six self-locking nuts (3). This will release ring segment

shield (4). Repeat procedure for other ring segment shield. Discard self-locking nuts.

2

Remove two machine bolts (5), two lockwashers (6) and two hex nuts (7). This will release power cable (8)

at bus bar terminal (9). Discard lockwashers.

NOTE

All harnesses must be tagged or marked to assure correct assembly.

3

Remove ten machine screws (10) securing harnesses (11 and 12). Lift off harnesses.

CAUTION

Use care in removing or installing ring segments. Place ring segments in a safe place to prevent

damage to the silver contact surface.

4

Remove eight self-locking screws (13) and eight flat washers (14). This will release ring segment (15). Re-

peat step for other ring segment. Discard self-locking screws.

5

6

7

2

3

1

10

4

13

15

14

SEGMENT RING AND COVER WITH

ATTACHING HARDWARE (DISASSEMBLED)