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TM 10-4320-348-14
SECTION V. UNIT TROUBLESHOOTING PROCEDURES
4.11 INTRODUCTION.
a.
Common malfunctions which you may find during operation or maintenance of the pumping assembly 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 assembly. 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 MALFUNCTION INDEX.
Malfunction
Page No.
1
Starting Handle Pulls, But Engine Fails To Start.................................................. 4-13
2
Excessive Lubrication Oil Consumption ............................................................... 4-13
3
Recoil Starter Rope Does Not Unwind Freely...................................................... 4-13
4
Recoil Starter Rope Does Not Rewind ................................................................. 4-13
4.13 UNIT TROUBLESHOOTING TABLE. Refer to Table 4-3 for the operator troubleshooting procedures authorized for
the pumping assembly.
4-12
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