Cummins/Onan — Adjusting the Governor (Battery Charging Sets)
Adjustments
From a Cummins/Onan service manual covering: 0.6MAJ, 1.0MAJ, 1.5MAJ, 1.5MAJ-224R, 1.5MAJ-232R, 2.5MAJ. Check it applies to your exact model before use.
Applies to: Cummins/Onan 2.5MAJ
Procedure
- Turn knurled speed adjusting nut (spring tension nut) to give desired charge rate.
- If governor hunts, turn sensitivity adjusting stud outward to move spring end farther from governor shaft center.
- Any change in sensitivity requires compensating change in speed adjustment.
- Maximum speed at full load operation is approximately 2400 rpm.
Specs & values
- 2400 rpm max full load
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.