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 372 of 828

TM 9–2350–311–20–2

6–50

Change 2

6–20 ASSISTANT 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)

Utility pail (item 7, Appx H)

Materials/Parts

Caps and plugs (item 7, Appx D)

Equipment Condition

Cannon in TRAVEL LOCK position

(TM 9–2350–311–10)

Discharge hydraulic pressure (para 6–3)

a.

Removal

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.

1

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

Catch dripping hydraulic fluid in utility pail.

2

Disconnect hydraulic tube (3) at check valve (4).

3

Disconnect two hydraulic tubes (5) at manifold (6).

WARNING

Support assistant gunner’s control assembly while removing three screws from elevation control

bracket to avoid injury to personnel and to assistant gunner’s control assembly.

4

Remove three cap screws (7) from elevation control bracket (8) and remove assistant gunner’s control as-

sembly (2) and elevation control bracket.

b.

Installation

1

Aline holes in elevation control bracket (8), assistant gunner’s control assembly (2) and secure to cab with

three cap screws (7).

2

Connect two hydraulic tubes (5) to manifold (6).

3

Connect hydraulic tube (3) to check valve (4).

4

Connect four hydraulic tubes (1) to four ports on underside of assistant gunner’s control assembly (2).