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Cummins/Onan — Engine Speed Adjustment

A Cummins/Onan service procedure — check it applies to your exact model before use.

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Procedure

  1. The speed at which the engine operates is determined by the tension applied to the governor spring.
  2. Increasing spring tension increases engine speed.
  3. Decreasing spring tension decreases engine speed.
  4. The no-load speed of the engine should be slightly higher than full-load speed.
  5. Speed must agree with load requirements for continuous operation.

Source: manual:940-1001 Onan NB Engine Service and Parts Manual (7-1972).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.