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 354 of 828

TM 9–2350–311–20–2

6–38

Change 2

6–15 MANUAL ELEVATION PUMP 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)

Lockwashers (3) (item 95, Appx G)

Equipment Condition

Discharge hydraulic pressure (para 6–3)

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

Vehicle MASTER switch to OFF (TM 9–2350–311–10)

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 hydraulic tube (1) at check valve (2). Catch draining hydraulic fluid in a utility pail.

2

Disconnect two hydraulic tubes (3) at rear of manifold assembly (4). Catch draining hydraulic fluid in a utility

pail.

3

Remove three cap screws (5) and three lockwashers (6) from top of manual elevation pump (7). Lift manual

elevation pump off elevation control bracket (8). Discard lockwashers.

b.

Installation

1

Place manual elevation pump (7) on elevation control bracket (8). Install three new lockwashers (6) and

three cap screws (5) to secure manual elevation pump.

2

Connect two hydraulic tubes (3) to rear of manifold assembly (4).

3

Connect hydraulic tube (1) to check valve (2).

4

Check hydraulic fluid level (para 6–2).