Cummins/Onan — Governor Control Adjustment
Adjustments · Electronic governor
From a Cummins/Onan service manual covering: DL4, DL6, DL6T, DL6U. Check it applies to your exact model before use.
Applies to: Cummins/Onan DL4, Cummins/Onan DL6, Cummins/Onan DL6T
Before you start
- Hold the throttle linkage so that the set will not overspeed.
Procedure
- Place Start/Stop/Remote switch in STOP.
- Attach frequency meter to generator output leads if none on panel.
- Locate governor control in control box.
- Adjust GAIN potentiometer fully counterclockwise.
- Hold throttle linkage to prevent overspeed; start the set.
- Adjust SPEED potentiometer to correct frequency (50 or 60 hertz).
- Adjust GAIN clockwise until governor hunts, then counterclockwise until stable.
- Test by tapping actuator lever; set should return to speed without hunting.
- Stop and restart set to verify it does not overspeed.
Tools required
- frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan DL6 →
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.