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 330 of 828

TM 9–2350–311–20–2

6–14

Change 2

6–3.1 EQUILIBRATED ELEVATION MECHANISM ASSEMBLY

This task covers:

a.

Discharging Pressure

b.

Bleeding

c.

Adjustment

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Utility pail (item 7, Appx H)

Materials/Parts

Hydraulic fluid, OHT (item 21, Appx D)

a.

Discharging Pressure

WARNING

Accumulator contains high pressure nitrogen. Use caution when handling and working with it to

avoid injury.

NOTE

You may have to repeat the bleed procedure several times. Check fluid level in power pack reservoir

after each bleed sequence and add hydraulic fluid as required (para 6–3c.).

EQUILIBRATED ELEVATION CYLINDER

SECONDARY ACCUMULATOR

MANIFOLD

HAND PUMP

PRIMARY ACCUMULATOR