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 127 of 828

TM 9–2350–311–20–2

3–18

3–3

TROUBLESHOOTING CHART — CONTINUED

b.

CANNON — CONTINUED

(2)

EXCESSIVE RECOIL FORCE. — CONTINUED

Check hydraulic pressure on replenisher pressure

gage (TM 9–2350–311–10).

Is replenisher pressure 17–24 psi (117.215–165.48 kpa)?

CONTINUED FROM STEP B

yes

no

Repeat procedures in step

C. If recoil cylinder cannot

be bled, notify support

maintenance.

CONTINUED ON NEXT PAGE

yes

no

C

D

1.

Using manual elevation handle, depress

cannon assembly to maximum depression

(TM 9–2350–311–10).

2.

Loosen right-hand bleed plug and bleed

trapped air from rear of buffer. Tighten

right-hand bleed plug when air-free fluid flows

(TM 9–2350–311–10).

3.

Using manual elevation handle, elevate cannon

assembly to 50 mils (TM 9–2350–311–10).

4.

Loosen left-bleed plug and bleed trapped air

from front of buffer. Tighten left-hand bleed plug

when air-free fluid flows (TM 9–2350–311–10).

5.

Using manual elevation handle, elevate cannon

assembly to 180 mils (TM 9–2350–311–10).

6.

Loosen bleed plug on bleeder tee and bleed

trapped air until air-free fluid flows. Tighten

bleed plug (TM 9–2350–311–10).

Does air-free fluid flow?

Add hydraulic fluid, bleed

system, and check for leaks

(TM 9–2350–311–10).