TP-5867 11/0218 Section 3 Troubleshooting
General Troubleshooting Chart, continued
Problem Possible Cause Corrective Action Reference
Generator set
starts but
shuts down
Low oil pressure (LOP) shutdown Correct cause of shutdown.
Check oil level, oil pump, etc.
Sections 4, Controller
Troubleshooting, 6.8, Fault
Shutdown Test Procedure, and
Engine S/M
No generator output voltage Check AC voltage. Separately
excite unit. Check stator
continuity.
Sections 6, Component Testing
and Adjustments, and 9, Wiring
Diagrams
Voltage regulator fuse blown Replace fuse. Section 4, Controller
Troubleshooting
Generator set
starts hard
Air cleaner clogged Replace element. Section 2.4, Air Cleaner Element
and Precleaner
Fuel mixture adjustment incorrect Adjust fuel valve. Section 6.11, Fuel Systems
Faulty spark plug(s) Replace and regap spark plug(s). Section 2.3, Spark Plugs
Defective ignition components
(spark control or ignition module)
Test/replace ignition components. Engine S/M
Worn piston rings, valves Check compression. Engine S/M
Insufficient fuel pressure Check fuel pressure Section 6.11.3, Fuel Regulators
Defective spark plug(s) Replace spark plugs. Engine O/M
Defective spark plug wire(s) Replace spark plug wires. Engine S/M
Generator set
No fuel Turn on fuel supply. —
stops
Fuel line restriction Inspect fuel lines. —
su
en
y
Fuel lines too long Check fuel line length. Section 6.11.1, Gas Piping
Air cleaner clogged Replace element. Section 2.4, Air Cleaner Element
and Precleaner
Fuse blown in controller Replace fuse. O/M
Faulty spark plug(s) Replace and regap plug(s). Engine S/M
Engine overheated (hot engine
only)
Check air intake, fuel adjustment,
oil level, air inlet/outlet.
Sections 2.5, Cooling System,
2.2, Lubrication System, and 6.11,
Fuel Systems
Overspeed shutdown Check electronic governor and
voltage regulator.
Section 6.9, Electronic Governor
Low oil pressure (LOP) shutdown Check engine oil level, oil
pressure, and oil pump.
Sections 2.2.1, Low Oil Pressure
Shutdown, 4.2.4, Low Oil
Pressure (LOP) Shutdown, 6.8,
Fault Shutdown Test Procedure,
and Engine S/M
Defective low oil pressure (LOP)
shutdown switch
Attempt startup. If unit shuts
down, remove lead from LOP
switch and reset controller. A
successful restart attempt
indicates a faulty LOP shutdown
switch.
Note: Verify engine oil pressure
before performing test and/or
replacing LOP shutdown switch.
Sections 2.2.1, Low Oil Pressure
Shutdown, and 4.2.4, Low Oil
Pressure (LOP) Shutdown
Defective fuel valve/fuel regulator Check regulator/valve operation. Sections 2, Scheduled
Maintenance, and 6, Component
Testing and Adjustments
Blown voltage regulator fuse Replace fuse. If fuse blows again,
test generator components.
Section 6.3, Voltage Regulator
Engine overloaded Reduce electrical load. O/M
Overcrank shutdown Check rotor. Section 6.4, Main Field (Rotor)
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