Generac 4700 / QuietPact 40 — Governor Adjustment
Adjustments · Engine governor
For the Generac 4700 / QuietPact 40, from the Generac service manual.
Applies to: Generac 4700, Generac QuietPact 40, Generac GH-220 engine
Procedure
- Loosen the governor clamp bolt.
- Push spring end of governor lever clockwise to wide open throttle position of lever.
- Hold lever at wide open throttle; rotate governor shaft fully clockwise with pliers using minimum force.
- While holding shaft fully clockwise and lever at wide open throttle, tighten governor clamp bolt to 70 inch-pounds (8 N-m).
- Start engine, let it stabilize and warm up at no-load.
- Turn the adjuster nut to obtain a frequency reading of 62 Hertz.
- If droop is excessive, move the governor spring down one slot on lever; for greater stability move it up one slot.
- Recheck frequency and readjust adjuster nut to obtain 62 Hertz at no-load.
- Check AC voltage reading; if incorrect the voltage regulator may require adjustment.
Tools required
- pliers Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Governor clamp bolt 70 inch-pounds (8 N-m)
- No-load frequency 62 Hertz
Full service-parts list: Generac 4700 →, Generac QuietPact 40 →
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.