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