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TM 10-4320-343-14
SECTION IV. UNIT TROUBLESHOOTING
4.8 UNIT TROUBLESHOOTING (All Except Model 350 PAFN).
Use the malfunction index to locate specific troubleshooting procedures contained in table 4-2. After locating the listed
malfunction, perform the test/inspections and corrective actions in the order listed in table 4-2. The malfunction index and
Table 4-2 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
Malfunction Number
in Table 4-2
Engine will not crank ...................................................................................................................................... 1
Engine will not start ........................................................................................................................................ 2
Engine speed does not adjust (non-regulated pump) ........................................................................................ 3
Engine starts or runs erratic after warmup (regulated pump) ............................................................................. 4
Engine starts or runs erratic after warmup ........................................................................................................ 5
Oil pressure reading low ................................................................................................................................. 6
Ammeter reading too low ................................................................................................................................ 7
Table 4-2. Unit Troubleshooting Table (All Except Model 350 PAFN).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE WILL NOT CRANK.
Step 1
Check for loose and corroded terminals on battery and starter.
Clean and tighten terminals. (paragraph 4.12.2)
Step 2
Test battery (paragraph 4.12,1)
a. Recharge battery if low.
b. Refer to Paragraph 4.12.2 and replace battery.
Step 3
Pull out emergency stop switch. Panel light should illuminate.
If panel light does not illuminate, go to Step 7.
Step 4
Press oil pressure bypass switch and listen for audible click.
a. If no click is heard, go to Step 5.
b. If click is heard, go to Step 6.
Step 5
Test blower V-belt contact switch. (Paragraph 4.10.9)
Replace V-belt contact switch. (Paragraph 4.10.10)
Change 1 4-7
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