Kohler — Gas/Gasoline Mechanical Governor Speed and Sensitivity Adjustment
Adjustments
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
- With the set running at full or rated load, check speed with hand tachometer or frequency meter.
- Loosen locking nut on speed adjusting screw; turn clockwise to increase speed (and frequency) or counterclockwise to decrease; lock nut at new setting.
- For sensitivity, loosen the nut at bottom of adjusting eyebolt and tighten the top nut to draw the head of the eyebolt closer to the governor arm pivot point (more sensitive).
- To make governor control less sensitive, loosen the top nut and tighten the bottom nut to move the head away from the pivot point.
- Recheck speed after sensitivity adjustment since changing this will also affect speed.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Speed droop of 3 Hz or 90 rpm between no load and full load is normal.
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.