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 177 of 828
TM 9–2350–311–20–2
3–66
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.
Turn MASTER and CAB POWER switches to
OFF.
2.
Leave jumper wire in place.
3.
Disconnect wire 645 at power relay box
assembly.
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?
G
yes
no
Repair or replace wire 645
(para 8–6).
H
POWER
RELAY BOX
ASSEMBLY
WIRE 645
POWER
RELAY BOX
ASSEMBLY
WIRE 100
–+
–
+
CONTINUED FROM STEP F
CONTINUED ON NEXT PAGE
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Ensure hydraulic pressure in power pack main
accumulator is below 925 psi (6378 kPa).
3.
Remove jumper wire from cannon plug and
reconnect cannon plug to pressure switch.
4.
Reconnect wire 645 to power relay box
assembly.
5.
Disconnect wire 100 at power relay box
assembly.
6.
Turn MASTER switch to ON.
7.
Place red multimeter lead in wire 100 connector
and black lead to ground.
8.
Check for voltage.
Is battery voltage present?
Back to Top
