TP-6161 1/1242 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
Alternator
x
AC output circuit breaker open Reset the breaker and check for AC voltage at the generator side
of the circuit breaker.
—
x
Transfer switch test switch in the
OFF position
Move the transfer switch test switch to the AUTO position. ATS O /M
x
Transfer switch fails to transfer load Move the ATS test switch to the AUTO position. Troubleshoot
the transfer circuit and time delays.
ATS O/M, S/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.[
—
x x
Voltage regulator digital settings
incorrect (digital controller only)
Adjust the voltage regulator. Sec. 2, Menu 11
x x
Voltage regulator inoperative Replace the voltage regulator fuse, If the fuse blows again,
troubleshoot the voltage regulator.
Gen. S/M
x x Voltage regulator out of adjustment Adjust the voltage regulator. Gen. S/M
Lubrication System
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
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
* 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 Manual
[ Have an authorized service distributor/dealer perform this service.
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