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 162 of 828
TM 9–2350–311–20–2
3–51
Replace selector valve as-
sembly (para 6–16). If mal-
function persists, replace
failed gunner’s control as-
sembly (para 6–19 or
6–20).
yes
no
Replace solenoid (para
6–16).
CONTINUED FROM STEP D
E
CONTINUED FROM STEP A
CONTINUED ON NEXT PAGE
WIRE 623
ELEVATION
CONTROL
SWITCH
GUNNER’S
SELECTOR
SWITCH BOX
ASSEMBLY
–
+
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Reconnect wire 623 to selector valve assembly
solenoid.
3.
Place ELEVATION CONTROL switch in NO. 1
MAN position.
4.
Disconnect wire 623 from quick disconnect at
gunner’s selector switch box assembly.
5.
Place ELEVATION CONTROL switch in
GUNNER position.
6.
Turn MASTER and CAB POWER switches to
ON.
7.
Place red multimeter lead in wire 623 leading to
gunner’s selector switch box assembly and
black lead to ground.
8.
Check for voltage.
Is battery voltage present?
Repair or replace wire 623
(para 8–8).
yes
no
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