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 160 of 828
TM 9–2350–311–20–2
Change 2
3–49
d.
ELEVATING SYSTEM — CONTINUED
(2)
CANNON MOVES BY ONLY ONE CONTROL
HANDLE, BUT MANUAL OPERATION IS NOR-
MAL.
INITIAL SETUP
Test Equipment
Multimeter (item 6, Appx H)
Tools
Artillery and turret mechanic’s tool kit
(SC 5180–95–CL–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)
Place ELEVATION CONTROL switch in NO. 1 MAN
position.
Is battery voltage present?
1.
Disconnect wire 623 from selector valve
assembly solenoid.
2.
Turn MASTER and CAB POWER switches to
ON.
3.
Place ELEVATION CONTROL switch in
GUNNER position.
4.
Place red multimeter lead in wire 623 and black
lead to ground.
5.
Check for voltage.
Is battery voltage present?
Go to step E.
yes
no
yes
no
A
SOLENOID
WIRE
623
B
CONTINUED ON NEXT PAGE
Replace ELEVATION CON-
TROL switch (para 8–12).
+–
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