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 182 of 828
TM 9–2350–311–20–2
Change 3
3–71
e.
CAB HYDRAULIC SYSTEM — CONTINUED
(2)
HYDRAULIC PRESSURE IS NORMAL, BUT
HYDRAULIC POWER IS NOT BEING SUP-
PLIED.
INITIAL SETUP
Test Equipment
Multimeter (item 6, Appx H)
Tools
Artillery and turret mechanic’s tool kit
(SC 4933–95–A12)
Personnel Required
2
Equipment Condition
Vehicle MASTER switch to OFF (TM 9–2350–311–10)
CAB POWER switch to OFF (TM 9–2350–311–10)
Cab access cover removed (para 14–11)
Replace power pack so-
lenoid (para 6–5).
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Have one man depress plunger on power pack
solenoid at top of power pack with screwdriver.
3.
Have second man traverse (left or right) and hold
left gunner’s control handle until accumulator
pressure gage reads zero.
Can hydraulic system be discharged?
1.
Disconnect wire 625A at power pack solenoid.
2.
Turn MASTER and CAB POWER switches to
ON.
3.
Place red multimeter lead in wire 625A and black
lead to ground.
4.
Check for voltage.
Is battery voltage present?
yes
no
A
Repair or replace wire
625A (para 8–2).
B
yes
no
WIRE 625A
POWER PACK
SOLENOID
+
–
Notify support mainte-
nance.
END OF TASK
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