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TM 10-4320-343-14
4.8.1 UNIT TROUBLESHOOTING (Model 350 PAFN).
Use the malfunction index to locate specific troubleshooting procedures contained in Table 4-2.1 After locating the listed
malfunction, perform the test/inspections and corrective actions in the order listed in Table 4-2.1. The malfunction index
and Table 4-2.1 cannot list all the malfunctions that may occur, all the tests and inspections needed to find the fault, or all
the corrective actions needed to correct the fault. If the equipment malfunction is not listed or actions listed do not correct
the fault, notify your supervisor.
Unit Malfunction Index (Model 350 PAFN)
Malfunction Number
in Table 4-2
Engine will not crank ...................................................................................................................................... 1
Engine will not start ........................................................................................................................................ 2
Engine speed does not adjust in manual mode ................................................................................................ 3
Engine runs erratic in automatic mode ............................................................................................................. 4
Oil pressure reading low ................................................................................................................................. 5
Ammeter reading low during operation ............................................................................................................ 6
Inoperable panel lights ................................................................................................................................... 7
Inoperable tachometer/hourmeter .................................................................................................................... 8
Inoperable pressure gauge (suction or discharge) ............................................................................................ 9
Engine stops when oil pressure bypass switch is released after startup ........................................................... 10
Table 4-2.1. Unit Troubleshooting Table (Model 350 PAFN).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE WILL NOT CRANK.
WARNING
Do not smoke or use spark or flame producing equipment while troubleshooting.
Move equipment off line and have a fire extinguisher at hand when troubleshooting
involves electrical circuits.
Failure to heed these warnings may result in death or serious injury of personnel.
Step 1
Check for loose and corroded terminals on battery and starter.
Clean and tighten terminals.
Step 2
Check for loose, worn or broken cooling fan belt (item 2, Figure 4-12).
Replace fan belt belt (paragraph 4-10.8) as required.
Step 3
Test for 12 Vdc at starter solenoid side terminal (blue wire) while attempting to start engine. If 12VDC
is available go to step 9.
Change 1 4-10.1
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