ARMY TM 9-6115-464-34
AIR FORCE 35C2-3-445-2
NAVY NAVFAC P-8-624-34
Section II. TROUBLESHOOTING
2-4. GENERAL.
This section provides information useful in diagnosing and correcting unsatisfactory operation or failure of
the generator sets and their components. Malfunctions which may occur are listed in table 2-2. Each
malfunction is followed by test or inspections and corrective actions. The corresponding listing of corrective
actions contains references to applicable maintenance paragraphs for correction of the malfunction.
NOTE
Refer to Operator and Unit Maintenance Manual for troubleshooting information
applicable to lower levels of maintenance.
Table 2-2 below contains information for locating and correcting operating troubles that may develop in the
generator set. Each malfunction listed for a component, a unit, or a system is followed by a troubleshooting
procedure that may help you determine what caused the trouble. Corrective action is provided to help you
remedy the problem.
Table 2-2. TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE FAILS TO CRANK
Step 1. Defective cranking relay K3 (34, figure 3-119).
Replace defective cranking relay (para. 3-90).
Step 2. Defective reverse polarity diode (CR3) (see figure 3-121).
Replace reverse polarity diode (para. 3-90).
Step 3. Defective starter solenoid (7 figure 3-1).
Repair or replace starter solenoid (para. 3-4).
Step 4. Defective starter motor (figure 3-1).
Repair or replace starter motor (para. 3-4).
Step 5. Defective starter drive assembly (figure 3-1).
Repair or replace starter drive assembly (para. 3-4).
2. ENGINE CRANKS BUT FAILS TO START.
Step 1. Defective fuel nozzle assembly (figure 3-25).
Clean, adjust, repair, or replace fuel nozzle assemble (para. 3-23).
2-4
