Cummins/Onan — Governor Sensitivity Adjustment
Adjustments
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- A too-sensitive setting will result in surging speed (hunting).
Procedure
- Run engine about 10 minutes to reach normal operating temperature.
- Ensure carburetor main load and idle needles are properly adjusted.
- Check engine speed with no load and again after connecting full-rated load; speed drop must be within 100 rpm.
- To increase sensitivity, move governor spring toward governor shaft.
- To decrease sensitivity, move governor spring toward linkage end of governor arm.
- Always recheck speed adjustment after 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
- Speed drop from no-load to full-load must be within 100 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.