ARMY TM 9-6115-464-34AIR FORCE 35C2-3-445-2NAVY NAVFAC P-8-624-34Section II. TROUBLESHOOTING2-4. GENERAL.This section provides information useful in diagnosing and correcting unsatisfactory operation or failure ofthe generator sets and their components. Malfunctions which may occur are listed in table 2-2. Eachmalfunction is followed by test or inspections and corrective actions. The corresponding listing of correctiveactions contains references to applicable maintenance paragraphs for correction of the malfunction.NOTERefer to Operator and Unit Maintenance Manual for troubleshooting informationapplicable to lower levels of maintenance.Table 2-2 below contains information for locating and correcting operating troubles that may develop in thegenerator set. Each malfunction listed for a component, a unit, or a system is followed by a troubleshootingprocedure that may help you determine what caused the trouble. Corrective action is provided to help youremedy the problem.Table 2-2. TROUBLESHOOTINGMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. ENGINE FAILS TO CRANKStep 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
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