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 129 of 828

TM 9–2350–311–20–2

3–20

3–3

TROUBLESHOOTING CHART — CONTINUED

b.

CANNON — CONTINUED

(3)

EXCESSIVE RECOIL TRAVEL AT HIGH

ANGLE OF FIRE.

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

References

TM 9–2350–311–10

CONTINUED ON NEXT PAGE

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?

A

B

Perform inspection of variable recoil

(TM 9–2350–311–10).

Do index arrows begin to separate at 617 mils and 723

mils?

yes

no

Notify support mainte-

nance.