Service Manual

7. Troubleshooting 10-2019
156 A062J683 (Issue 1)Copyright © 2019 Cummins Inc.
17. Measure field, quadrature, and main winding resistance.
• Clean the slip rings, replace the brushes, repair the harness, and replace
the rotor and stator assembly if necessary.
18. Check brush alignment:
a. Inspect brush wear on the slip rings and verify brush misalignment is
toward the windings.
b. If the misalignment is toward the bearing, the cause is not a tolerance
issue but is more likely the result of the end bell not being seated properly
during assembly.
• Inspect for cause and repair if necessary.
19. 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.
d. Inspect the spark plugs for damage and proper gap:
• Remove and inspect spark plugs. If they are damaged or dirty, replace
them.
• Measure the spark plug gap. Re-gap if necessary.
20. Measure the temperature of the air intake and temperature rise across the
generator set.
• Remove the blockage or prevent air recirculation if necessary.
Code 19 - Governor Actuator Shutdown
Logic: Controller sensed governor actuator circuit is open or shorted.
Possible Causes:
• Wire connections
• Governor actuator