Generac — Calibrate DC Control/Latch-Crank Circuit Board
Adjustments
From a Generac service manual — check it applies to your exact model before use.
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Before you start
- Steps 2 and 3 MUST be completed before the engine is started following circuit board replacement, or an overspeed shutdown may occur at normal rated operating speed.
- If "OVERSPEED" shutdown occurs on engine start in step four, reverse initial pot settings in steps two and three.
Procedure
- Locate the "Fine" and "Coarse" potentiometers and the red LED on the circuit board.
- Turn the "Coarse" pot all the way counterclockwise (CCW).
- Turn the "FINE" pot all the way clockwise (CW).
- Start the engine manually; let it stabilize and warm up at normal rated no-load speed; adjust governor if needed.
- Slowly turn the "Coarse" pot clockwise until the red LED just turns on.
- Slowly turn the "Fine" pot counterclockwise until the red LED just goes out.
- Slowly turn the "Fine" pot clockwise until the red LED just turns on.
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Overspeed shutdown will occur about 10 Hertz above no-load speed
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.