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 147 of 828

TM 9–2350–311–20–2

3–38

Change 2

3–3

TROUBLESHOOTING CHART — CONTINUED

c.

CAB TRAVERSING SYSTEM — CONTINUED

(2)

MANUAL TRAVERSE HANDWHEEL ROTATES

WHILE TRAVERSING IN POWER.

INITIAL SETUP

Test Equipment

Multimeter (item 6, Appx H)

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)

1.

Disconnect wire 819B at electric clutch housing

(M109A2/M109A3 howitzers) or clutch valve

(M109A4/M109A5 howitzers).

2.

Turn MASTER and CAB POWER switches to ON

and the TRAVERSE CONTROL switch to power.

3.

Place red multimeter lead in wire 819B and black

lead to ground.

4.

Check for voltage.

Is battery voltage present?

Replace wire 819B

(para 8–7).

A

yes

no

B

yes

no

CLUTCH

HOUSING

WIRE

819B

+–

CONTINUED ON NEXT PAGE

WIRE 819B

CONNECTOR

J2 CONNECTOR

HARNESS

SOCKET G

CLUTCH

VALVE

+

–

+

–

M109A2/M109A3 HOWITZERS

M109A4/M109A5 HOWITZERS

WIRE 819B

Go to step E for M109A2/

M109A3 howitzers or step

F for M109A4/ M109A5

howitzers.

1.

Turn MASTER and CAB POWER switches to OFF.

2.

Disconnect harness from J2 connector at

gunner’s selector switch box assembly.

3.

Place one multimeter lead in wire 819B

connector and other lead to socket G of J2

connector harness.

4.

Check for continuity.

Is continuity present?