Cummins/Onan NH-MS/1 / NH-S/1 — Variable Speed Governor Adjustment
Adjustments
For the Cummins/Onan NH-MS/1 / NH-S/1, from the Cummins/Onan service manual.
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Procedure
- Run the engine and make the necessary carburetor adjustments.
- Adjust the throttle stop screw for a recommended minimum idling speed of 900 rpm.
- Adjust the governor spring tension for minimum speed (approximately 1500 rpm at no load).
- At minimum speed, move the governor spring inward to increase sensitivity or outward to decrease it.
- Apply full load and shift the variable control to maximum speed.
- Set the bracket slot screw to stop lever travel at the desired maximum full load speed.
Tools required
- Tachometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Recommended maximum full load speed for continuous operation approximately 3000 rpm
- Minimum idling speed 900 rpm
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.