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 145 of 828

TM 9–2350–311–20–2

3–36

3–3

TROUBLESHOOTING CHART — CONTINUED

c.

CAB TRAVERSING SYSTEM — CONTINUED

(1)

CAB WILL NOT TRAVERSE UNDER POWER

OR MANUALLY, BUT HYDRAULIC PRESSURE

IS NORMAL AND CAB LIGHTING OPER-

ATES.– CONTINUED

Replace wire 825A from

gunner’s selector switch

box assembly to bypass

valve assembly (para 8–7).

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 on output terminal

3 of TRAVERSE CONTROL switch and the

other lead to pin C of J2 connector.

4.

Check for continuity.

Is continuity present?

E

yes

no

CONTINUED FROM STEP D

OUTPUT TERMINAL

GUNNER’S

SELECTOR

SWITCH BOX

ASSEMBLY

J2 CONNECTOR

–

+

TRAVERSE

CONTROL

SWITCH

Replace wire from TRAV-

ERSE CONTROL switch

to pin C of J2 connector

(para 8–12).

PIN C

CONTINUED ON NEXT PAGE