Service manual

9. Troubleshooting 9-2013
3. Measure the generator set load capability with a shop load bank (de-rate for altitude and
temperature as necessary).
4. Measure AC frequency and droop while the generator set is running.
5. Measure AC frequency while changing engine rpm to determine if frequency response
matches engine rpm response.
6. Disconnect the generator set control J1 connector, verify J1 pins are fully inserted, and
inspect pin condition using the steps below:
• Use the test points of the tester tool #420-0603
• Use a mating pin connector, a pin gauge of the same size (.045") as the mating
control connector pin, or any suitable device that will not damage the inside contact
wipers of the pin socket
• Insert, repair, or replace pins as necessary.
7. Reconnect the J1 connector and test run the generator set for fault occurrence: repair or
replace pins in the connector as necessary.
8. Check air filter cleanliness; replace the air filter as necessary.
9. Measure steady DC voltage at the fuel solenoid while the generator set is running; repair
wiring as necessary.
10. 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 generator set on shop fuel supply; verify tank level and fuel line condition.
11. Verify clear vent hose.
12. Check the generator set fuel lines for damage: replace the fuel line as required.
13. Measure the regulator lock off pressure.
14. Check the intake manifold and gaskets for air leaks: tighten fasteners and replace the
gaskets and manifold as necessary.
15. Check for a blocked or damaged exhaust system: repair or replace the exhaust
components as necessary.
16. Verify actuator function by applying DC voltage to the terminals: replace the actuator as
necessary.
17. Check the carburetor for binding; inspect the spring for dirt and debris: clean the spring,
replace the carburetor as necessary.
18. Verify that spark plug cables are secure on the spark plugs: reconnect or replace as
necessary.
19. Inspect the ignition kill lead (J1-12) in the harness and at connector J1: repair or replace
the lead, terminal, or pins as necessary.
20. Measure spark plug gap: set gap or replace spark plugs as necessary.
21. Verify ignition spark condition.
98 A030A239 (Issue 10)