Cummins/Onan B43 / B48 — Governor Adjustment - Fixed Speed

Adjustments

For the Cummins/Onan B43 / B48, from the Cummins/Onan service manual.

Applies to: Cummins/Onan B48

Procedure

1. Engine speed is controlled by adjusting governor spring tension.
2. On side pull governors the governor spring is factory set in the third hole of the governor arm.
3. On front pull governors the governor spring is factory set in the second hole of the governor arm adapter.
4. To increase sensitivity, move spring loop into a hole closer to the pivot.
5. To decrease sensitivity, move spring loop into a hole farther from the pivot.
6. After sensitivity is set, recheck low speed rpm setting and adjust if necessary.
7. Check governor arm, linkage, throttle shaft and lever for binding or excessive slack.

Full service-parts list: Cummins/Onan B48 →

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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