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Table 4-1. Unit PMCS-continued -706880146
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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SYMPTOM-continued -706880148
TM 5-4210-233-14&P-1
Section IV. UNIT TROUBLESHOOTING PROCEDURES
4-6.
GENERAL. Troubleshooting at the Unit Maintenance level requires you to locate any trouble as
quickly as possible. Once the trouble is located, repair or replace the part if you are authorized to do so, or
determine if a higher category of maintenance is required.
4-7.
PROCEDURES. Repair by Unit Maintenance is limited by tools, test equipment, and replacement
parts allocated to that level. Before using the troubleshooting table, check your work order and talk to the
operator, if possible, for a description of the symptoms if the trouble occurred while the equipment was in
operation.
4-8.
SYMPTOM INDEX. Refer to Table 4-2, Operator Troubleshooting, under the number against the
symptom in this index to determine the tests and corrective action required.
SYMPTOM
PAGE NO.
CAB
NO HEAT ................................ ................................ ................................ ........................
NO DEFROST ................................ ................................ ................................ .................
FAN INOPERATIVE ................................ ................................ ................................ ........
WASHER INOPERATIVE ................................ ................................ ................................
WIPER WON'T RUN ................................ ................................ ................................ .......
WIPER WON'T CLEAR WINDSHIELD ................................ ................................ ............
CAB DOOR WON'T OPEN ................................ ................................ ..............................
PUMP COMPARTMENT
WATER GAUGE INOPERATIVE ................................ ................................ .....................
PUMP GAUGE INOPERATIVE ................................ ................................ .......................
ENGINE GAUGE INOPERATIVE ................................ ................................ ....................
AUXILIARY POWER UNIT
WON'T CRANK ................................ ................................ ................................ ................
WON'T START................................ ................................ ................................ .................
CRANKS SLOWLY................................ ................................ ................................ ...........
ERRATIC OPERATION ................................ ................................ ................................ ....
LOW POWER ................................ ................................ ................................ .................
WATER PUMP & PIPING
PUMP WON'T ENGAGE ................................ ................................ ................................ ..
INSUFFICIENT PRESSURE ................................ ................................ ...........................
WON'T PRIME ................................ ................................ ................................ ................
PUMP LEAKS ................................ ................................ ................................ .................
VALVE LEAKS ................................ ................................ ................................ ................
FOAM PERCENTAGE INCORRECT ................................ ................................ ...............
4-18

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