Cummins/Onan — Electric Governor Adjustment
Adjustments · Governor controller
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Check the dip switch (SW1-SW4) settings for the application frequency and spec.
- Start the set, warm up under a partial load (at least 1/4 rated load), then disconnect all loads.
- If the governor was replaced, adjust the Gain to approximately 5 and Stability to 3.5.
- Adjust the Gain pot until the engine is stable and responsive; turn counterclockwise to eliminate hunting.
- Bump the throttle lever a couple of times to check for hunting.
- Apply full load and adjust the Stability pot to minimize overshoot.
- Attach a tachometer or frequency meter and adjust the Speed Trim pot to the desired speed.
- Shut down and restart the genset to check for overspeed shutdown on startup.
Tools required
- Tachometer or frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Gain approximately 5, Stability 3.5 if governor replaced
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.