TP-5964 7/01
22 Section 4 Troubleshooting
Possible Causes
Section or
Publication
Reference
[
Recommended Actions
Trouble Symptoms
Possible Causes
Section or
Publication
Reference
[
Recommended Actions
Excessive or
unusual 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
Controls Inoperative start/stop switch x Check the switch, replace as necessary.* S/M
Fuel
System
Empty the fuel tank or fuel valve
shutoff
x x Add fuel and move the fuel valve to the ON
position.
—
Air in the fuel system (diesel)
x x x x
Bleed the air from the fuel system. O/M
Inoperative fuel feed (diesel)
x x x x x
Replace the fuel pump.* Engine S/M
Dirty or faulty fuel injectors (diesel)
x x x
Contact an authorized distributor/dealer. —
Inoperative fuel solenoid
x
Contact an authorized distributor/dealer. —
Incorrect fuel injection timing (diesel)
x x x x
Contact an authorized distributor/dealer. —
Cooling
Low coolant level
x
Restore coolant to the normal operating level. O/M
System
Inoperative cooling water pump x Tighten or replace the belt. Replace the
water pump.*
O/M
High temperature shutdown x Allow the engine to cool down. Then
troubleshoot the cooling system.*
Engine S/M
Inoperative thermostat
x x
Replace the thermostat.* Engine S/M
Generator
Blocked air openings x Remove obstructions. Allow the generator set
to cool.
—
Open output circuit breaker x Find and correct the cause of the open
breaker. Reset the breaker.
—
Transfer switch turned to OFF
x
Turn the switch to the AUTO position. —
Open wiring, terminals, or pin in the
exciter field
x Check for continuity.* S/M
Inoperative main field (rotor) (open or
grounded)
x Test and/or replace the rotor.* S/M
Inoperative stator (open or grounded)
x
Test and/or replace the stator.* S/M
Excessive vibration
x
Tighten loose components.* —
* Have an authorized service distributor/dealer perform this service.
[ Reference Key: I/M: generator set installation manual; O/M: generator set operation manual; S/M: generator set service manual.
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