Kohler — LP Primary Regulator Adjustment
Adjustments · LP primary (high-pressure) regulator
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
- Internal relief valve opens at approximately 1 psig on regulators set at 11 in. water column.
Procedure
- Energize both solenoids; remove lead 71 from starter solenoid.
- Disconnect J9/P9 and P20/J20; apply 12 VDC to J20 to hold antidiesel solenoid.
- Depress prime button on secondary regulator.
- Connect manometer between secondary regulator and carburetor.
- Reading should be 7-11 in. (4-6 oz) water column.
- Adjust screw clockwise to increase, counterclockwise to decrease outlet pressure.
- Replace closing cap after adjustment.
- Reconnect all connectors and lead 71; start and run set.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Outlet pressure 7-11 in. water column (4-6 oz)
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.