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 159 of 828

TM 9–2350–311–20–2

3–48

Change 2

3–3

TROUBLESHOOTING CHART — CONTINUED

d.

ELEVATING SYSTEM — CONTINUED

(1)

CANNON DOES NOT ELEVATE OR DEPRESS

UNDER POWER OR MANUALLY, BUT HY-

DRAULIC PRESSURE IS NORMAL.

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

yes

no

A

Verify fault is corrected.

Continue normal opera-

tions.

Notify support mainte-

nance.

END OF TASK

1.

Check pressure of nitrogen charge in primary

accumulator assembly (para 19–5), secondary

accumulator (para 19–6), and manual pump

accumulator assembly (para 19–3).

2.

Charge as necessary (para 19–5, 19–6, and

19–3).

3.

Adjust equilibrated elevating system after

charging accumulators (para 6–3.1).

Does cannon elevate or depress?

EQUILIBRATED ELEVATING CYLINDER

SECONDARY ACCUMULATOR

PRIMARY

ACCUMULATOR