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 423 of 828

TM 9–2350–311–20–2

Change 2

7–17/(7–18 blank)

7–4

ACTUATING VALVE

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)

Lockwashers (2) (item 95, Appx G)

Equipment Condition

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

•

Have a utility pail available to catch hydraulic fluid from valve and connectors.

•

Dispose of hydraulic fluid in accordance with local regulations.

1

Disconnect four tubes (1).

2

Remove two cap screws (2), two lockwashers (3), and actuating valve assembly (4). Discard lockwashers.

b.

Installation

1

Install actuating valve assembly (4) using two new lockwashers (3) and two cap screws (2).

2

Connect four tubes (1).

3

1

2

4