Cummins/Onan — Frequency Adjustments
Adjustments · governor
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan NHEL
Procedure
- Set altitude adjust knob to altitude (gasoline only).
- Disconnect all loads and check zero amps.
- Adjust governor speed screw for 62-63 Hz no-load (51.5-52.5 Hz).
- Check output voltage within 10 percent of rated voltage.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan NHEL →
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.