Cummins/Onan — Resetting High-Idle Speed
Adjustments · Governor / high-idle stop screws
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKC, Cummins/Onan HDKCA, Cummins/Onan HDKCB
Before you start
- Adjusting screws are near rotating belts and pulleys that can cause severe personal injury
Procedure
- Remove governor actuator but leave it connected; plug the opening.
- Disconnect the fuel pump and power it directly with a 12-volt battery.
- Disconnect all loads from the generator set and start it.
- Adjust the stop screws to obtain 67.3-68.3 Hertz (2019-2049 rpm).
- Seal the adjusting threads with paint.
- Reinstall all components that were removed or disconnected.
Specs & values
- 67.3-68.3 Hertz (2019-2049 rpm)
Full service-parts list: Cummins/Onan HDKC →, Cummins/Onan HDKCA →, Cummins/Onan HDKCB →
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.