Kohler — Electronic Governor Adjustment
Adjustments
From a Kohler service manual covering: 4CFKM, 4CKM, 5CKM, 5CKM/SCKMR, ACKM/4CKMR. Check it applies to your exact model before use.
Applies to: Kohler 4CFKM, Kohler 4CKM, Kohler 5CKM, Kohler M18 engine, Kohler M20 engine
Before you start
- Do not use speed adjustment pot to check the overspeed cutout point.
Procedure
- Check alignment of governor actuator shaft to carburetor throttle shaft.
- Attach frequency meter to AC output leads and run to normal temperature.
- Adjust speed pot to obtain full load speed of 60 Hz or 50 Hz.
- With no load, turn gain pot 1/8 turn counterclockwise until stable.
- Apply rated load and observe frequency reading.
- Remove load and observe frequency returns to speed adjustment value.
- Check overspeed cutout point by manually moving throttle shaft clockwise.
- Turn overspeed pot as necessary to obtain desired cutout point.
Tools required
- Frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Factory overspeed setting 72 Hz for 60 Hz models and 60 Hz for 50 Hz models
- No-load and full-load frequencies within +0.5% of desired
Full service-parts list: Kohler 4CFKM →, Kohler 4CKM →, Kohler 5CKM →
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.