Cummins/Onan — Idle Speed Stop Adjustment
Adjustments · governor/carburetor
From a Cummins/Onan service manual covering: 4.5 MCE, 5.0 MCE, 6.5 MCE. Check it applies to your exact model before use.
Applies to: Cummins/Onan 4.5 MCE, Cummins/Onan 5.0 MCE, Cummins/Onan 6.5 MCE, Cummins/Onan MCE engine
Procedure
- Start set and warm up ten minutes under 1/2 to 3/4 rated load.
- Disconnect load and turn governor speed adjusting screw for 50 Hz (40 Hz).
- Set idle speed stop screw so it does not touch throttle lever tang.
- Turn idle speed stop screw for 55 Hz (45 Hz).
- Turn governor speed adjustment nut for no-load 62-63 Hz (51.5-52.5 Hz).
Full service-parts list: Cummins/Onan 4.5 MCE →, Cummins/Onan 5.0 MCE →, Cummins/Onan 6.5 MCE →
Source: Cummins/Onan 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.