Cummins/Onan — Two-Speed Governor Adjustment
Adjustments · Two-speed governor (electric solenoid type)
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Extreme tension on the high speed governor spring will cause damage to the solenoid coil. Tension must be loose enough so that the plunger will pull all the way into solenoid when operating at high speed.
Procedure
- Run engine and make necessary carburetor adjustment.
- Adjust low-speed spring tension for desired low speed (recommended minimum idling speed of 1,500 rpm for engines operating under load at idle speed).
- Adjust high-speed tension by turning plunger on adjusting stud (with locking nut loosened) so when plunger is pulled all the way into solenoid it gives desired high speed.
- Adjust sensitivity for high-speed operation to attain smoothest no load to full load operation.
Tools required
- Tachometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Recommended minimum idling speed: 1,500 rpm
- Recommended maximum full load speed for continuous operation: approximately 3,000 rpm
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.