TM 10-4320-310-14
Section IV. TROUBLESHOOTING
4-9. TROUBLESHOOTING
a. Table 4-2 contains troubleshooting information for locating and correcting most of the operating troubles which
are the responsibility of unit maintenance. Each malfunction for an individual component, unit, or system is followed by a
list of tests or inspections which will help you to determine probable causes and corrective actions to take. Perform the
tests/inspections and corrective actions in the order listed.
b. 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.
c. Only those functions within the scope of unit maintenance are listed. For troubleshooting procedures within the
scope of operator maintenance, refer to table 3-1.
4-10. SYMPTOM INDEX
Refer to the Symptom Index below. Locate the malfunction which is the same, or most nearly the same, as the trouble
you are having with the centrifugal pump unit. The Symptom Index lists the first page of the troubleshooting information
for that malfunction. Follow the steps one by one, and perform the corrective actions listed.
Symptom Index
Malfunction
Number
Description
Page
1
Engine fails to crank
4-7
2
Engine cranks but fails to start
4-7
3
Engine runs unsteadily and power output is low
4-9
4
Dense smoke from exhaust after warm-up
4-9
5
Engine overheats
4-9
6
Pump makes excessive noise
4-9
7
Pump output low
4-9
Table 4-2. Unit Maintenance Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE FAILS TO CRANK
Correction of malfunction is beyond unit maintenance.
Notify direct support maintenance.
2. ENGINE CRANKS BUT FAILS TO START
Step 1.
Check that extra fuel button has been pulled out prior to starting.
Pull out extra fuel button and attempt to start engine (para 2-4.c)
Step 2.
Check non-return valve for proper function
4-7
