Cummins/Onan — Frequency (Speed) Adjustment - Electronic Governor

Adjustments · Electronic engine governor

From a Cummins/Onan operator's manual — check it applies to your exact model before use.

Applies to: Cummins/Onan MDGDA, Cummins/Onan MDGDB

Procedure

1. Warm up the set under partial load (at least 1/4 rated load).
2. Turn the Speed potentiometer to obtain specified power supply frequency (60 Hertz - 1800 RPM or 50 Hertz - 1500 RPM).
3. Turn the Gain potentiometer clockwise until the governor begins to hunt, then turn it back until there is no audible hunting.
4. Connect 1/4 rated load and readjust the Gain potentiometer if necessary.
5. Connect rated load in one step. Shut down the set if it cannot pick up the load. Lengthen the governor rod by half turns of the swivel ends and repeat the test until the set picks up rated load in one
6. Check for stability (no audible hunting) under various loads.
7. Stop the set, wait 30 seconds for the turbo to coast down (if so equipped), restart and check for speed overshoot.

Full service-parts list: Cummins/Onan MDGDA →, Cummins/Onan MDGDB →

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 →