Generac — Overspeed Shutdown Adjustment
Adjustments · Engine Control Circuit Board
From a Generac service manual covering: IM100G, IM80G, NP100G, NP80G. Check it applies to your exact model before use.
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Procedure
- Turn the OVERSPEED SHUTDOWN POT counterclockwise until it just contacts its stop. DO NOT FORCE.
- Connect an accurate AC frequency meter across the generator AC output leads.
- Start the engine, let it stabilize and warm up at no-load.
- Slowly increase engine speed until the frequency meter reads 69-71 Hertz.
- Hold the throttle at 69-71 Hertz, then slowly turn the OVERSPEED SHUTDOWN POT clockwise. When the engine shuts down, overspeed setting is correct.
Tools required
- AC frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Shutdown at approximately 69-71 Hertz (2070-2130 rpm)
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.