Cummins/Onan 6.5NH - 3CR / 6000 A — Governor Speed and Sensitivity Adjustment
Adjustments
For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.
Applies to: Cummins/Onan NH engine
Procedure
- Speed: turn the speed adjusting nut to increase speed or out to decrease speed; no-load speed should be slightly higher than the speed required by the connected load.
- Sensitivity: move the governor spring toward the governor shaft to increase sensitivity, or toward the linkage end to decrease it.
- If too sensitive, a hunting condition results; if not sensitive enough, speed variation between no-load and full-load is too great.
- Always recheck the speed adjustment after a sensitivity adjustment.
Tools required
- Tachometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Engine speed drop from no-load to full-load should be not less than 60 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.