Cummins/Onan — Adjust governor speed
Adjustments
From a Cummins/Onan service manual covering: 10MJC, 15MJC, 3MJA, 4MJA, 5MJB, 705MJB. Check it applies to your exact model before use.
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Procedure
- Hold governor spring stud.
- Adjust governor spring nut with wrench.
- Use reed frequency meter on AC output.
- Set speed within range.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- See frequency and speed table
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.