Cummins/Onan 5.0BF - 34 3E / S.OSF - 34 IE — Governor Adjustment
Adjustments
For the Cummins/Onan 5.0BF - 34 3E / S.OSF - 34 IE, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 5.0BF - 34 3E, Cummins/Onan BF engine
Procedure
- Adjust carburetor main jet for best full load mixture.
- Adjust carburetor idle needle with no load.
- Adjust length of governor linkage.
- Check governor linkage and throttle shaft for binding or looseness.
- Adjust governor spring tension for nominal no-load speed.
- Check rpm drop from no-load to full-load and adjust sensitivity.
- Recheck speed adjustment.
- Set carburetor throttle stop screw.
Tools required
- tachometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Idle approximately 2200-2300 rpm
- Maximum approximately 3600 rpm
Full service-parts list: Cummins/Onan 5.0BF - 34 3E →
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.