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 161 of 828
TM 9–2350–311–20–2
3–50
Change 2
3–3
TROUBLESHOOTING CHART — CONTINUED
d.
ELEVATING SYSTEM — CONTINUED
(2)
CANNON MOVES BY ONLY ONE CONTROL
HANDLE, BUT MANUAL OPERATION IS NOR-
MAL. –
CONTINUED
1.
Place ELEVATION CONTROL switch in NO. 1
MAN position.
2.
Apply small amount of pressure to plunger.
Does plunger retract?
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Discharge hydraulic pressure (para 6–3.1). Do
not reconnect wire 645 at pressure switch.
3.
Remove solenoid from selector valve assembly
body (para 6–16).
4.
Reconnect wire 623 to solenoid.
5.
Depress plunger.
6.
Ground edge of solenoid to valve body.
7.
Turn MASTER and CAB POWER switches to
ON.
8.
Place ELEVATION CONTROL switch in
GUNNER position.
Does plunger protrude from bottom of solenoid?
yes
no
C
Replace solenoid (para
6–16).
D
WIRE 623
SOLENOID
PLUNGER
SELECTOR
VALVE
ASSEMBLY
CONTINUED FROM STEP B
CONTINUED ON NEXT PAGE
Back to Top
