TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 Change 2 3–80.1/(3–80.2 blank) 3–3 TROUBLESHOOTING — CONTINUED g. CAB POWER SYSTEM The cab power system consists of the slip ring, contact arm assemblies, and gunner’s selector switch box assembly. The internal gunner’s selector switch box assembly components that relate to the cab power system are the CAB POWER switch and the CAB POWER indicator light. Power is transferred from the hull to the cab through the slip ring and contact arm assemblies. This power is then distributed by wire 100 directly to various cab systems such as cab lighting and NBC. These systems will operate with the CAB POWER switch in the OFF position. Other systems receive power through the CAB POWER switch. These systems in- clude elevating, cab traversing, and cab hydraulics. CONTACT ARM ASSEMBLIES GUNNER’S SELECTOR SWITCH BOX ASSEMBLY POWER RELAY BOX ASSEMBLY GUNNER’S SELECTOR SWITCH BOX ASSEMBLY POWER RELAY BOX ASSEMBLY POWER PACK ASSEMBLY PRESSURE SWITCH CAB POWER SWITCH CIRCUIT BREAKER 100 148 645 104 100 100 645 104 645 TO INTERCOM SYSTEM TO CONTACT ARM ASSEMBLIES 645 645 625A 625A 645 P N A B C E F GHI J K LMN O D