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 151 of 828

TM 9–2350–311–20–2

3–40.2

Change 2

3–3

TROUBLESHOOTING CHART — CONTINUED

c.

CAB TRAVERSING SYSTEM — CONTINUED

(2.1)

CAB WILL NOT TRAVERSE UNDER POWER,

MANUAL OPERATION IS NORMAL.

INITIAL SETUP

Applicable Configuration

M109A4/M109A5 howitzer

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Equipment Condition

Vehicle MASTER switch to OFF (TM 9–2350–311–10)

CAB POWER switch to OFF (TM 9–2350–311–10)

TRAVERSE CONTROL switch to POWER

(TM 9–2350–311–10)

1.

Check to ensure wire 819B to clutch valve

electrical solenoid is connected.

2.

Turn MASTER switch to ON.

3.

Turn CAB POWER switch to ON.

Does the clutch valve override lever move?

A

yes

no

B

yes

no

Replace clutch valve

electrical solenoid (para

6–8).

Traverse cab while pulling up on clutch valve

override lever.

Does the cab traverse under power?

Replace clutch valve

(para 6–8).

Notify support maintenance.

CLUTCH

VALVE

OVERRIDE

LEVER

WIRE

819B

CLUTCH

VALVE

ELECTRICAL

SOLENOID

CLUTCH

VALVE