Generac — Adjusting No-Load Frequency for NP-50G/LP
Adjustments · Governor
From a Generac service manual covering: NP-50G, NP-50LP, NP-66G/LP, Q-40G, Q-55G/LP, Q-70G/LP. Check it applies to your exact model before use.
Applies to: Generac NP-50G, Generac NP-50LP, Generac Q-40G, Generac NP-50G/LP engine
Procedure
- Loosen governor clamp bolt.
- Push spring end of governor lever clockwise to wide open throttle position of lever.
- Hold governor lever at wide open throttle and, with pliers, rotate governor shaft fully counterclockwise.
- While holding governor shaft fully clockwise and governor 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 adjuster nut to obtain a frequency reading of 62 Hertz.
- Check governor spring location in slot of governor lever.
- If droop is excessive, move governor spring down one slot on lever.
- For greater stability, move governor spring up one slot on lever.
- Recheck frequency reading; readjust adjuster nut if necessary to obtain 62 Hertz at no-load.
- When frequency is correct at no-load, check AC voltage; 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
- 70 inch-pounds (8 N-m)
- 62 Hertz no-load
Full service-parts list: Generac NP-50G →, Generac NP-50LP →, Generac Q-40G →
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.