TP-6390 1/06
42 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 to the ON position. —
x x Fuel pressure insufficient
Check the fuel supply and valves.[
S/S, Gen. O/M
x x x x Fuel line restriction Check the fuel lines and fuel tank. Eng. O/M
x x x Stale or bad fuel. Incorrect type of fuel Replace fuel. Clean the carburetor. Sec. 3, Eng S/M
x x x Fuel feed pump inoperative
Replace the fuel feed 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 Reset the controller. If the overcrank fault occurs again, contact
the distributor/dealer.
—
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
Low oil pressure (LOP) switch
inoperative
Replace the LOP switch. W/D
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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