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
