TP-6252 2/08
46 Section 4 Troubleshooting
Section or
Publication
Reference*
Recommended ActionsProbable Causes
Trouble Symptoms
Section or
Publication
Reference*
Recommended ActionsProbable Causes
Excessive or
abnormal noise
High fuel
consumption
Low oil
pressure
Overheats
Lacks power
Stops
suddenly
No or low
output voltage
Starts hard
Cranks but
does not start
Does not
crank
Fuel System
x x Fuel tank empty or fuel valve shut off Add fuel and move the fuel valve t o the ON position. —
x x x x Fuel filter restriction Clean or replace the fuel filter. Eng. O/M
x Fuel solenoid inoperative
Troubleshoot the fuel solenoid.[
Eng. S/M
x x x Air in fuel system (diesel only) Bleed the diesel fuel system. Eng. O/M
x x x
Fuel or fuel injectors dirty or faulty
(diesel only)
Clean, test, and/or replace the inoperative fuel injector.[
Eng. S/M
x x x x
Fuel injection timing out of adjustment
(diesel only)
Adjust the fuel injection timing.[
Eng. S/M
x x x
Fuel feed or injection pump inoperative
(diesel only)
Rebuild or replace the injection pump.[
Eng. S/M
Generator
x
AC output circuit breaker open Reset the breaker and check for AC voltage at the generator
side of the circuit breaker.
—
x
Overcrank shutdown Close the seacock and completely drain the water from the
exhaust system at the silencer’s drain plug. Do not attempt
generator set restart. Contact an authorized distributor/dealer.
Section 2.6.2
x
Transfer switch test switch in the OFF
position
Move the transfer switch test switch to the AUTO position. ATS O/M
x
Wiring, terminals, or pin in the exciter
field open
Check for continuity. Gen. S/M, W/D
x
Main field (rotor) inoperative (open or
grounded)
Test and/or replace the rotor.[
Gen. S/M
x Stator inoperative (open or grounded)
Test and/or replace the stator.[
Gen. S/M
x Vibration excessive
Tighten loose components.[
—
Lube System
x x x Oil level low Restore the oil level. Inspect the generator set for oil leaks. Eng. O/M
x Low oil pressure shutdown Check the oil level. Eng. O/M
x x x x
Crankcase oil type incorrect for
ambient temperature
Change the oil. Use oil with a viscosity suitable for the operating
climate.
Eng. O/M
* Sec./Section—numbered section of this manual; ATS—Automatic Transfer Switch; Eng.—Engine; Gen.—Generator Set; I/M—Installation Manual; O/M—Operation Manual; S/M—Service Manual;
S/S—Spec Sheet; W/D—Wiring Diagram
[ Have an authorized service distributor/dealer perform this service.
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