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TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download

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