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Cummins/Onan — Preliminary adjustment: Before adjusting the governor

For these Cummins/Onan models: BGD, NHD.

Applies to: Cummins Onan Bgd

Procedure

  1. Loosen the jam nut at the ball joint end of the gover-
  2. Disconnect the governor rod from the throttle lever.
  3. With the carburetor throttle fully open and the gov-
  4. Turn the governor rod in (shorter) one full turn.
  5. Reconnect the governor rod and retighten the jam
  6. Run the genset at least 15 minutes at 50% to 75% of
  7. Remove the load and let the set stabilize 10 to 15
  8. Read the gensetfrequency. With no load,frequency
  9. Turn the speed nut until the no-load frequency is
  10. - 50 Hz (38 - 42 Hz for 50 Hz sets).
  11. Slowly turn the idle stop screw in to increase the
  12. Turn the speed nut in until the no-load frequency is
  13. - 63 Hz (51.5 - 52.5 Hz for 50 Hz sets).
  14. Connect rated load.
  15. Check frequency with rated load connected.
  16. Check output voltage. Service the generator (Sec-
  17. 5 Hz for 50 Hz sets), and check droop again.
  18. Hzsets), turn the sensitivity adjustment screw
  19. Check governor response under no load, 1 14 load,
  20. load, 314 load and rated load. If the governor

Source: manual:965-0529 Onan BGD NHD (spec A-G) Commercial Genset Service manual (05-1992).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.