Cummins/Onan — Stability Adjustment
Adjustments · Voltage regulator VR21
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Run the generator set at rated frequency and no load.
- Slowly turn the STABILITY pot clockwise until voltage becomes stable.
- Turn counterclockwise until voltage again becomes unstable.
- Turn the pot slightly clockwise from this position for maximum stability.
- Readjust voltage after a stability adjustment.
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.