Generac — Test 41 – Check / Adjust Governor (410cc Engine)
Adjustments · Engine governor
From a Generac service manual covering: GP1800, GP1850, GP3250, GP5000, GP5500, GP6500, GP7000, GP8000. Check it applies to your exact model before use.
Applies to: Generac GP1800, Generac GP3250, Generac GP5000, Generac GP5500, Generac GP6500, Generac GP7000, Generac GP8000, Generac OHVI engine
Procedure
- Loosen the governor clamp bolt.
- Hold governor lever at wide open throttle; rotate governor shaft clockwise fully.
- Tighten governor lever clamp bolt to 70 inch-pounds (8 Nm).
- Start generator; let it stabilize and warm up at no-load.
- Connect frequency meter across generator AC output leads.
- Turn the primary adjust screw to obtain a frequency of 62.5 Hz.
Tools required
- frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 70 inch-pounds (8 Nm) clamp bolt torque
- 62.5 Hz no-load frequency
Full service-parts list: Generac GP1800 →, Generac GP3250 →, Generac GP5000 →, Generac GP5500 →, Generac GP6500 →, Generac GP7000 →, Generac GP8000 →
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.