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TM 5-4210-220-12
Section II. OPERATOR TROUBLESHOOTING PROCEDURES
3-1. GENERAL.
Troubleshooting at the operator level requires you to locate any trouble as quickly as possible. Once the trouble is
located, perform the corrective action required.
If the malfunction is not listed or is not corrected by your actions, notify your supervisor.
3-2. SYMPTOM INDEX.
Refer to table 3-1, OPERATOR TROUBLESHOOTING under the number against the system in this index to determine
the test and corrective action required.
APU
FAILS TO CRANK ..................................................................................................................................................... 1a
CRANKS BUT WILL NOT START.............................................................................................................................. 1b
RUNNING UNEVEN AND STALLS FREQUENTLY.................................................................................................... 1c
FIRE PUMP
WON'T PRIME........................................................................................................................................................... 2a
WON'T ENGAGE....................................................................................................................................................... 2b
VALVES
FAILS TO OPERATE ................................................................................................................................................. 3a
LEAKING ................................................................................................................................................................... 3b
WATER PIPING
WON'T DRAIN ............................................................................................................................................................. 4
DISCHARGE HOSE
WON'T DEPRESSURIZE............................................................................................................................................. 5
FOAM DISCHARGE
NO DISCHARGE ....................................................................................................................................................... 6a
EXCESS FOAM ......................................................................................................................................................... 6b
TURRET
WON'T DISCHARGE ................................................................................................................................................... 7
WATER TANK
FOAM ENTERING ....................................................................................................................................................... 8
FOAM TANK
WATER ENTERING .................................................................................................................................................... 9
3-2
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