Service Manual

7. Troubleshooting 10-2019
166 A062J683 (Issue 1)Copyright © 2019 Cummins Inc.
8. Check for air filter cleanliness.
• Replace the air filter as necessary.
9. Check for a blocked or damaged exhaust system.
• Repair or replace exhaust components as necessary.
10. Measure the generator set load capability with a shop load bank.
11. Propane models only:
a. When ambient temperatures are less than 40 °F (34.4 °C), vapor
withdrawal propane tanks should be at least half full to provide the proper
vaporization rate.
b. Propane having more than 2.5% butane will not vaporize in ambient
temperatures at less than 32 °F (0 °C); use HD-5 grade propane.
c. Verify tank level and fuel line conditions.
12. Measure steady DC voltage at the fuel solenoid while the generator set is
running.
• Repair wiring as necessary.
13. Verify the vent hose is clear.
14. Check the generator set fuel lines for damage.
• Replace the fuel line as necessary.
15. Measure the fuel supply pressures.
16. Check the governor actuator, actuator linkage, and throttle shaft for free smooth
motion without slop. Verify that the actuator is opening the throttle while
cranking.
17. Check the engine ignition system:
a. Verify that the spark plug leads are fully installed on the spark plugs.
Reconnect them if necessary.
b. Inspect the spark plug leads. Replace worn or damaged leads.
NOTICE
Spark plug leads are only available as part of the coil assembly.
c. Check the magneto output:
i. Using a spark tester, verify that the magneto coils are providing
acceptable output. If the output is not acceptable, verify proper
magneto gap (see Section 2.5 on page 17), and re-gap if necessary.
ii. Verify that the magnet that is in the flywheel is still magnetic, is not
damaged, and/or has not been misplaced. Replace the flywheel if
necessary.
iii. If the magneto coil is still not functioning properly, replace it.