Cummins/Onan 12.5 RDJC / 15.0 RDJC — Governor Sensitivity Adjustment

Adjustments

For the Cummins/Onan 12.5 RDJC / 15.0 RDJC, from the Cummins/Onan operator's manual.

Applies to: Cummins/Onan 12.5 RDJC, Cummins/Onan 15.0 RDJC, Cummins/Onan RDJC

Procedure

1. Turn the sensitivity adjusting ratchet to adjust governor sensitivity (no-load to full-load speed droop).
2. Radiator cooled sets: turn the ratchet clockwise for more sensitivity (less speed drop at full load).
3. Radiator cooled sets: turn the ratchet counterclockwise for less sensitivity (more speed drop).
4. City water cooled sets: turn the ratchet counterclockwise for more sensitivity.
5. After making the sensitivity adjustment, readjust the speed.

Full service-parts list: Cummins/Onan RDJC →

Source: Cummins/Onan operator's 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.

More Cummins/Onan repair guides →