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 149 of 828

TM 9–2350–311–20–2

3–40

Change 2

3–3

TROUBLESHOOTING CHART — CONTINUED

c.

CAB TRAVERSING SYSTEM — CONTINUED

(2)

MANUAL TRAVERSE HANDWHEEL ROTATES

WHILE TRAVERSING IN POWER. — CON-

TINUED

Replace clutch valve

electrical solenoid (para

6–8).

Replace electrical contact

assembly (para 11–3).

yes

no

Notify support main-

tenance.

yes

no

ELECTRICAL

CONTACT ASSEMBLY

TRAVERSING

CLUTCH

CONTINUED FROM STEP A

CLUTCH

VALVE

OVERRIDE

LEVER

1.

Turn MASTER and CAB POWER switches to

OFF.

2.

Remove and inspect traversing clutch electrical

contact assembly (M109A2/M109A3 howitzers)

for wear or damage.

Is contact defective?

E

CONTINUED FROM STEP A

1.

Turn MASTER and CAB POWER switches to

OFF.

2.

Reconnect wire 819B to clutch valve electrical

solenoid.

3.

Turn Vehicle MASTER switch to ON.

4.

Turn CAB POWER switch to ON.

Does the clutch valve override lever move?

WIRE

819B

CLUTCH

VALVE

ELECTRICAL

SOLENOID

F

CONTINUED ON NEXT PAGE