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 187 of 828

TM 9–2350–311–20–2

3–76

3–3

TROUBLESHOOTING — CONTINUED

e.

CAB HYDRAULIC SYSTEM — CONTINUED

(6)

GUNNER’S OR ASSISTANT GUNNER’S CON-

ROL HANDLE DOES NOT RETURN TO NEU-

TRAL POSITION WHEN RELEASED.

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Materials/Parts

Hydraulic fluid (OHT) (item 21, Appx D)

Equipment Condition

Discharge hydraulic pressure (para 6–3)

Replace faulty control as-

sembly (para 6–19 or

para 6–20).

Ensure hydraulic filter assembly indicators are in

bypass mode to check for foreign matter in hydraulic

fluid.

Is foreign matter present?

yes

no

yes

no

FILTER

ASSEMBLY

DIPSTICK

FILTER

ELEMENT

NOTE

Step B applies only to M109A4/M109A5 howitzers.

Proceed to step C for M109A2/M109A3 howitzers.

CONTINUED ON NEXT PAGE

A

B

Turn MASTER and CAB POWER switches to OFF.

Did gunner’s or assistant gunner’s control handle return to

neutral position?

Notify support mainte-

nance.