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 175 of 828
TM 9–2350–311–20–2
3–64
3–3
TROUBLESHOOTING — CONTINUED
e.
CAB HYDRAULIC SYSTEM — CONTINUED
(1)
POWER PACK HYDRAULIC PUMP MOTOR
DOES NOT OPERATE, BUT CAB LIGHTING
SYSTEM OPERATES NORMALLY. — CON-
TINUED
1.
Close gunner’s selector switch box assembly.
2.
Reconnect harness at J2 connector of gunner’s
selector switch box assembly.
3.
Disconnect wire 625A–645 from quick-
disconnect at gunner’s selector switch box
assembly.
4.
Place red multimeter lead in wire 625A–645 and
black lead to ground.
5.
Turn MASTER and CAB POWER switches to
ON.
6.
Check for voltage.
Is battery voltage present?
Repair or replace wire
625A–645 from quick-dis-
connect to gunner’s selec-
tor switch box assembly
(para 8–7).
yes
no
WIRE
625A–645
–+
CONTINUED FROM STEP B
CONTINUED ON NEXT PAGE
WIRE 645
_
+
C
D
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Reconnect wire 625A-645 to quick-disconnect at
gunner’s selector switch box assembly.
3.
Disconnect wire 645 from quick-disconnect at
pressure switch.
4.
Turn MASTER and CAB POWER switches to
ON.
5.
Place red multimeter lead in wire 645 and black
lead to ground.
6.
Check for voltage.
Is battery voltage present?
PRESSURE SWITCH
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