Table 2-2. Generator Set Troubleshooting

Table 2-2. Generator Set Troubleshooting Malfunction Probable cause Corrective action 1. Engine fails to crank when Defective crank relay a. With START-STOP-RUN switch START-STOP-RUN switch a. (K3). (S2) in START position, check for is moved to START position 24 Vdc across relay K3 (two small terminals) X1 and X2 in set special box If voltage is present, check for voltage across relay contacts, two large terminals. If voltage is present, relay K3 is defective. Replace relay K3 (para 8-7). b. Defective CR3 diode. b. Gain access to set special relay assembly (para 8-6). Test diode CR3 (para 14-10). Replace defective diode. c. Defective ring gear. c. Inspect ring gear. Replace defective — ring gear (para 14-69 and 14-70). d. Starter motor brushes d. Replace starter motor brushes worn or not contact- (para 14-26, and fig. 14-10). ing properly. e. Defective starter motor e. Replace starter motor solenoid solenoid. (para 14-27 and fig. 14-10) and adjust (para 14-30 and fig. 14-14). f. Defective starter f. Replace starter motor (para. 14-25, motor. and fig. 14-9). 2. Engine cranks but fails to a. Incorrect valve and a. Time as shown in figure 14-34. start injector timing. b. Valves burned or b. Check valves (para 14-77). Replace sticking. — valves (para 14-77 and 14-79), c. Valve clearance C. Check clearance. Adjust fuel incorrect. injector (Operator and Organ- izational Maintenance Manual). d. Governor actuator d. Check governor (para 7-2), improperly posi- Adjust governor actuator tioned. (para 7-8). e. Defective solenoid e. Replace defective solenoid on fuel injection (para 14-46), pump. NOTE Gain access to set special relay assembly. f. Dc relay control _. f With S2 in START position, assembly (A5) measure dc voltage between defective. A5 terminal 21 and ground stud It should read 24 Vdc. Measure dc voltage between A5 terminal 23 and ground stud. If no voltage exists, replace dc relay control circuit assembly (A5) (para 8-6). 2-10