Cummins/Onan 1B Series — Governor adjustment
Adjustments
For the Cummins/Onan 1B Series, from the Cummins/Onan owner's manual.
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Procedure
- Loosen clamp screw holding governor arm on governor shaft.
- With spring holding arm in open throttle position, insert screwdriver in shaft slot.
- Turn shaft clockwise as far as possible, hold, tighten lock screw.
- Do not force arm down so it binds on gearcase.
- Move arm toward cylinder; spring should snap it back to wide open.
- Adjust speed with adjusting nut: clockwise increase, counterclockwise decrease.
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan owner's 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.