Cummins/Onan — Governor Preliminary Adjustments
Adjustments · EFC electric governor
From a Cummins/Onan owner's manual covering: 450 DFW, 450 DM, 500 DM, 600 DFY, 750 DFZ. Check it applies to your exact model before use.
Applies to: Cummins/Onan 450 DFW, Cummins/Onan 450 DM, Cummins/Onan 500 DM, Cummins/Onan 600 DFY, Cummins/Onan 750 DFZ, Cummins/Onan VTA-28-GI engine, Cummins/Onan VT-28-G engine, Cummins/Onan VTA28-G2 engine, Cummins/Onan KTA-38-GI engine
Procedure
- Turn idle speed potentiometer counterclockwise to its stop, then clockwise 10 turns.
- Turn run speed potentiometer counterclockwise to its stop, then clockwise 10 turns.
- Turn gain potentiometer fully counterclockwise.
- Turn droop potentiometer fully counterclockwise for isochronous operation.
- Turn droop screw to approximately 40 for 3 percent droop.
- Turn droop screw to approximately 80 for 5 percent droop.
Specs & values
- 3 percent droop at approximately 40
- 5 percent droop at approximately 80
Source: Cummins/Onan owner'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.