Cummins/Onan GS-107-AC — Adjusting governor speed and sensitivity

Adjustments

For the Cummins/Onan GS-107-AC, from the Cummins/Onan service manual.

Applies to: Hol-Gar GS-107-AC, Cummins/Onan J120-S/967F engine

Procedure

1. Hold sensitivity stud with a screwdriver.
2. Turn speed adjusting nut clockwise to increase speed.
3. Use a tachometer to indicate engine speed.
4. Relocate spring in governor arm notches for coarse sensitivity.
5. Turn sensitivity stud counterclockwise to increase sensitivity.
6. Adjust for maximum sensitivity without hunting.

Full service-parts list: Hol-Gar GS-107-AC →

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.

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