Service manual

9. Troubleshooting 9-2013
8. Check for blocked or damaged exhaust system: repair or replace exhaust components as
necessary.
9. Propane Models
a. When ambient temperatures are less than 40°F vapor – withdrawal Propane tanks
should be at least half full to provide proper vaporization rate.
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 tank level and fuel line condition.
10. Measure steady DC voltage at the fuel solenoid while the generator set is running; repair
wiring as necessary.
11. Verify clear vent hose.
12. Check the generator set fuel lines for damage: replace the fuel line as required.
13. Measure the fuel supply and regulator lock-off pressures.
14. Check the governor, actuator, linkage, and spring for debris, damage, and looseness:
readjust and repair as necessary.
15. Verify that the spark plug cables are secure on the spark plugs: reconnect or replace as
necessary.
16. Inspect the ignition kill lead (J1-12) in the harness and at connector J1: repair or replace
the lead, terminal, or pins as necessary.
17. Measure the spark plug gap: set the gap or replace the spark plugs as necessary.
18. Verify the ignition spark condition.
19. Inspect the spark plug leads, kill lead terminals at magnetos, and measure magneto air
gap: replace the terminals, set the gap, or replace the magnetos as necessary.
20. 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.
21. Measure field, quadrature, and main winding resistance to ground: clean the slip rings,
replace the brushes, repair the harness, and replace the rotor or stator as necessary.
22. 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.
23. Check the alignment of the brushes to the slip rings.
9.15 Overvoltage - Fault Code 12
Logic: Instantaneous Fault - AC voltage S1-S2 greater than 300 VAC Delayed Fault - AC
voltage line-to-line greater than 278 VAC, but less than 150 VAC for 3 continuous seconds.
Possible Causes: Generator set loads, wire connections, windings
Diagnosis & Repair:
1. Verify that Last Fault is FC 12: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Measure and verify AC voltage at the customer connection block and at pins J1-34 and J1-
35.
92 A030A239 (Issue 10)