Kohler — Diesel Mechanical Governor Frequency Adjustment
Adjustments · Fuel Pump High Speed Screw
From a Kohler service manual covering: CSG-649, Cummins 4B, Cummins 6B, Ford CSG-649, Ford LSG-423, Ford LSG-875, LSG-423, lsg-875. Check it applies to your exact model before use.
Applies to: Ford CSG-649, Cummins/Onan LSG-423, Cummins/Onan lsg-875
Procedure
- Start the generator set, observe the frequency meter.
- Loosen the fuel pump high speed screw locknut to make the adjustments.
- To increase or decrease the frequency (at no load), rotate the screw clockwise or counterclockwise respectively.
- Tighten the locknut.
- Loaded droop frequency may alternately be adjusted to the operating frequency at full load.
Tools required
- Frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Ford CSG-649 →, Cummins/Onan lsg-875 →
Source: Kohler 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.