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 370 of 828

TM 9–2350–311–20–2

6–48

Change 2

6–19 GUNNER’S CONTROL ASSEMBLY

This task covers:

a.

Removal

b.

Installation

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Materials/Parts

Caps and plugs (item 7, Appx D)

Lockwashers (2) (item 65 Appx G)

Self-locking nut (item 98, Appx G)

Equipment Condition

CAB POWER switch to OFF (TM 9–2350–311–10)

Discharge hydraulic pressure (para 6–3)

CAUTION

All hydraulic lines and ports must be capped to prevent contaminants from entering the hydraulic

system and causing internal damage to hydraulic components.

NOTE

Dispose of hydraulic fluid in accordance with local regulations.

a.

Removal

1

Disconnect six hydraulic tubes (1) from six ports on underside of gunner’s control assembly (2).

2

Remove three machine bolts (3) and one self-locking nut (4). Discard self-locking nut.

3

Remove gunner’s control assembly (5) from elevation control bracket (6).

NOTE

Remove bracket only if damaged.

4

Remove cap screw (7), cap screw (8), two lockwashers (9), and elevation control bracket (6). Discard lock-

washers.

b.

Installation

NOTE

Install bracket if it was removed.

1

Install elevation control bracket (6) using cap screw (7), cap screw (8), and two new lockwashers (9).

2

Place gunner’s control assembly (5) in elevation control bracket (6).

3

Install one new self-locking nut (4) and three machine bolts (3).

4

Install six hydraulic tubes (1) to six ports on underside of gunner’s control assembly (2).