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 183 of 828

TM 9–2350–311–20–2

3–72

3–3

TROUBLESHOOTING — CONTINUED

e.

CAB HYDRAULIC SYSTEM — CONTINUED

(3)

HYDRAULIC FLUID OVERFLOWS FROM TOP

OF SIGHT GAGE OR CONTAMINATED CRYS-

TALS IN HYDROSCOPIC BREATHER.

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)

Equipment Condition

Cab access cover removed (para 14–11)

1.

Discharge pressure in hydraulic system (para

6–3).

2.

Check power pack gage for hydraulic fluid

level.

Is fluid level over FULL AT 0 PRESSURE mark?

Charge main accumulator

assembly nitrogen (para

19–4). If malfunction per-

sists, notify support mainte-

nance.

NOTE

A loss of nitrogen pressure in the main accumulator

assembly will affect hydraulic fluid level reading on

sight gage. Sight gage will show hydraulic fluid level to

be low. Adding hydraulic fluid to compensate for this

loss of nitrogen will result in an overflow of hydraulic

fluid from top of sight gage when system is

discharged.

A

yes

no

CONTINUED ON NEXT PAGE

POWER

PACK

GAGE

FULL AT 0 PRESSURE MARK