Generac 91401256S / Bsc 556 — DYNA-MASTER Calibration and Adjustment
Adjustments · electronic engine governor
For the Generac 91401256S / Bsc 556, from the Generac service manual.
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Procedure
- Set GAIN fully counterclockwise.
- SPEED is factory set for idle; may need clockwise turn before engine starts.
- For droop operation, adjust DROOP potentiometer clockwise; for isochronous, turn fully counterclockwise.
- If remote speed potentiometer is used, set to mid-range.
- Start engine and adjust SPEED potentiometer to desired speed.
- Adjust GAIN slowly clockwise until governor hunts, then counterclockwise until stable.
- Upset governor by tapping actuator lever; engine should return to commanded speed without hunting.
Specs & values
- droop potentiometer 9 o'clock about 3% droop
Source: Generac 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.