Service manual

9-2013 9. Troubleshooting
b. Propane having more than 2.5 percent Butane will not vaporize in ambients at less
than 32°F; use HD-5 grade Propane.
c. Run the generator set on shop fuel supply; verify the tank level and fuel line condition.
12. Measure steady DC voltage at the fuel solenoid while the generator set is running; repair
wiring as necessary.
13. Verify clear vent hose.
14. Check the generator set fuel lines for damage: replace the fuel line as required.
15. Measure fuel supply and regulator lock off pressures.
16. Check the governor, actuator, linkage, and spring for debris, damage, and looseness:
readjust and repair as necessary.
17. Measure field, quadrature, and main winding resistance: clean the slip rings, replace the
brushes, repair the harness, and replace the rotor or stator as necessary.
18. Measure field, quadrature and main winding resistance to ground: clean slip rings, replace
brushes, repair harness and replace rotor or stator as necessary.
19. Measure field, quadrature, and main winding resistance to each other: clean the slip rings,
replace the brushes, repair the harness, and replace the rotor or stator as necessary.
20. Check brush alignment:
Inspect brush wear on the slip rings and verify brush misalignment is toward the windings.
If misalignment is toward the bearing, the cause is not from this tolerance issue and is
likely the result of the end bell not being seated properly during assembly. Inspect for
cause and repair as necessary.
21. Verify that spark plug cables are secure on spark plugs: reconnect or replace as
necessary.
22. Inspect ignition kill lead (J1-12) in harness and at connector J1: repair or replace lead,
terminal or pins as necessary.
23. Measure spark plug gap: set the gap or replace the spark plugs as necessary.
24. Verify ignition spark condition.
25. Inspect the spark plug leads, kill lead terminals at magnetos, and measure magneto air
gap: replace the terminals, set the gap, or replace magnetos as necessary.
9.18 Underfrequency - Fault Code 15
Logic: Frequency less than 54 Hz (for the 60 Hz model) or 45 Hz (for the 50 Hz model) for 8
continuous seconds.
Possible Causes: Generator set loads, engine governor function, fuel supply, air fuel mixture,
exhaust system, choke, demand regulator, carburetor, generator windings, ignition, wire
connections
Diagnosis & Repair:
1. Verify that the Last Fault is FC 15: Yes, continue diagnosis; No, troubleshoot actual last
fault.
2. Measure AC current while running the generator set with loads: identify faulty or short
cycling loads.
A030A239 (Issue 10) 95