Generac — Test 27 - Check / Adjust Governor
Adjustments
From a Generac service manual covering: GP1000, GP1100, GP1800, GP2000, GP2200, GP2600, GP2800, GP3250, GP3300, GP3600, GP5000, GP5500…. Check it applies to your exact model before use.
Applies to: Generac GP1800, Generac GP3250, Generac GP3300, Generac GP5000
Procedure
- Loosen governor clamp bolt
- Hold governor lever at wide open throttle position
- Rotate governor shaft counterclockwise (389/208/196cc) or clockwise (410cc) as far as it will go
- Tighten governor lever clamp bolt to 110 in-lbs (389/208/196cc) or 70 in-lbs (410cc)
- Turn speed adjustment screw counterclockwise three full turns to avoid overspeed
- Start engine and let warm up under no-load
- Connect AC frequency meter; no-load frequency should be 62.0-62.5 hertz
- Turn speed adjust screw until frequency/RPM is within limits
- Apply removable Loctite (Loctite 241) to speed adjust screw threads
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
- 62.0-62.5 hertz no-load
Full service-parts list: Generac GP1800 →, Generac GP3250 →, Generac GP3300 →, Generac GP5000 →
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.