TM-9-2350-311-20-1
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS
AUGUST 1994
TM-9-2350-311-20-1 - Page 402 of 1275
TM 9-2350-311-20-1
3-3 TROUBLESHOOTING CHART — CONTINUED
ab. BILGE PUMP CIRCUIT
The bilge pump is used to evacuate water from the engine compartment, usually after fording. The bilge pump is not to
be run for more than 1 minute in a dry compartment or 15 minutes in a wet compartment unless the engine is running.
The bilge pump system consists of the bilge pump, bilge pump relay, bilge pump circuit breaker, and related electrical
wiring.
To operate the bilge pump, the MASTER switch must be ON. By turning the MASTER switch ON, power from the
batteries travels through the MASTER relay to the circuit breaker. From the circuit breaker the power travels to the
BILGE PUMP switch. Once the BILGE PUMP switch is turned ON, the power travels through the bilge pump circuit
breaker to the bilge pump relay. The bilge pump relay sends the power to the bilge pump and the bilge pump is
energized.
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