TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 3–68 3–3 TROUBLESHOOTING — CONTINUED e. CAB HYDRAULIC SYSTEM — CONTINUED (1) POWER PACK HYDRAULIC PUMP MOTOR DOES NOT OPERATE, BUT CAB LIGHTING SYSTEM OPERATES NORMALLY. — CON- TINUED 1. Turn MASTER and CAB POWER switches to OFF. 2. Reconnect wire 104 to power relay box assembly. 3. Remove distribution cover from power relay box assembly (para 8–13). 4. Turn MASTER and CAB POWER switches to ON. 5. Place red multimeter lead on output bus bar of circuit breaker and black lead to ground. 6. Check for voltage. Is battery voltage present? CIRCUIT BREAKER + – Low voltage in battery can cause points to stick on the power relay. Check battery voltage prior to doing step J (TM 9–2350–311–20–1). NOTE NBC control box assembly must be removed to open cab power relay box assembly in M109A4/M109A5 howitzers (para 17–4). CONTINUED FROM STEP I J yes no CONTINUED ON NEXT PAGE Replace circuit breaker (para 8–13). CAUTION