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TM 10-4320-316-14
SECTION V. UNIT TROUBLESHOOTING PROCEDURES.
4-10. GENERAL. This section contains troubleshooting information for locating and correcting most of the operating
troubles which may develop in the DED pump. Each malfunction for an individual component, unit, or system is followed
by a list of tests or inspections which will help you to determine corrective actions to take. You should perform the
tests/inspections and corrective actions in the order listed.
In general, engine exhaust is an excellent way to tell what kind of condition your centrifugal pump is in. Exhaust color of
black, or bluish-white, smoke is normal before the engine warms up fully. As the engine reaches normal operating
temperature, the exhaust becomes clear or light blue, provided there are no problems. If the exhaust does not clear up,
a problem is indicated.
When exhaust color is abnormal, turn off the engine immediately and notify your supervisor. Use Table 4-2 as a
guideline to exhaust symptoms.
Table 4-2. Troubleshooting by Exhaust Color.
EXHAUST COLOR:
LIKELY INDICATES:
Clear or light bluish condition
Normal operating
Continuous black smoke
Overloading
Seizure of moving part
Incorrect combustion
Continuous bluish-white smoke
Lubricating oil is being
consumed
This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed, or is not corrected by listed corrective actions, notify your supervisor.
Table 4-3 lists the common malfunctions which you may find during the operation or maintenance of the DED pump.
You should perform the tests/inspections and corrective actions in the order listed.
4-9
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