Cummins/Onan 6GO — Governor Adjustment
Adjustments
For the Cummins/Onan 6GO, from the Cummins/Onan operator's manual.
Applies to: Continental Red Seal Y91-273 or Y91-264 engine
Before you start
- Any change in the setting of the sensitivity screw will require correcting the speed screw adjustment.
- Be sure all load is removed when adjusting the bumper screw.
Procedure
- With engine stopped and tension on the governor spring, adjust linkage length so carburetor throttle stop lever clears stop pin by not less than 1/64 in.
- Start the plant and allow it to reach operating temperature.
- With no electrical load, adjust speed screw until voltage is approximately 126 volts for a 115 volt AC plant or 121 volts for a DC plant.
- Apply full load and check voltage; approximately 108 volts for a 115 volt AC plant or 110 volts for a DC plant.
- Engine speed should be within 1890 r.p.m. at no load to 1745 r.p.m. at full load for an AC plant.
- If the plant hunts under load, increase slightly the distance between the eye of the sensitivity screw and its support.
- If hunting occurs at no load, screw the small bumper screw in until the hunt is stopped, but not far enough to increase engine speed.
- Tighten all lock nuts when adjustments are completed.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 1/64 in throttle stop lever clearance
- 126 volts no load (115 V AC plant)
- 108 volts full load (115 V AC plant)
Source: Cummins/Onan operator'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.