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TM 10-4320-311-14
Section IV. UNIT TROUBLESHOOTING PROCEDURES
INDEX
Para
Page
4-8
General .....................................................................................................................................4-12
4-8.
General.
a.
Common malfunctions which you may find during operation or maintenance of the pumping unit or its
components are listed in Table 4-3. You should perform the tests/inspections and corrective actions in the order they
appear.
b.
In general, engine exhaust is an excellent way to determine the condition of your pumping unit. 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.
c.
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
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
d.
This manual cannot list all malfunctions that may occur, nor all tests and corrective actions. If you find a
malfunction not listed, or listed incorrectly, notify your supervisor.
NOTE
Before using this table, be sure all applicable Operator and Unit PMCS have been performed.
4-12
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