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 181 of 828
TM 9–2350–311–20–2
3–70
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
Notify support mainte-
nance.
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Reconnect wire 104 to power relay box
assembly.
3.
Disconnect wire 104 at power pack pump
motor.
4.
Turn MASTER and CAB POWER switches to
ON.
5.
Ensure power pack main accumulator
assembly pressure is below 925 psi (6378
kPa).
6.
Place red multimeter lead in wire 104
connector and black lead to ground.
7.
Check for voltage.
Is battery voltage present?
Repair or replace wire 104
(para 8–5).
yes
no
END OF TASK
POWER PACK
PUMP MOTOR
WIRE 104
+–
CONTINUED FROM STEP I
M
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