Cummins/Onan 6.5NH - 3CR / 6000 A — Governor Adjustment
Adjustments
For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.
Applies to: Cummins/Onan NH engine
Procedure
- Run the engine about 15 minutes to reach normal operating temperature.
- Adjust the carburetor main jet for best fuel mixture at full rated load.
- Adjust the carburetor idle needle with no load connected.
- Adjust the length of the governor linkage.
- Check the governor linkage and throttle shaft for binding or excessive looseness.
- Adjust the governor spring tension for rated speed at no load (booster temporarily disconnected).
- Adjust the governor sensitivity.
- Recheck the speed adjustment.
- Set the carburetor throttle stop screw.
- Adjust the booster (where used).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- No-load speed slightly higher than load speed; e.g. 1875 rpm no load for 1800 rpm load
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.