Cummins/Onan W3M-19 — Governor Adjustment
Adjustments · Engine governor
For the Cummins/Onan W3M-19, from the Cummins/Onan service manual.
Applies to: Cummins/Onan W3M-19, Cummins/Onan W2C engine
Before you start
- If no-load and full-load voltages cannot be kept within limits, engine or generator brush adjustment needs attention
Procedure
- Run power unit at normal operating temperature with no load.
- Loosen main adjusting stud locknut.
- Turn adjusting nut on stud to obtain correct generated voltage.
- Turn nut clockwise to raise voltage, counterclockwise to lower.
- Check voltage at full 3 kw resistance load; should not drop below 115 volts.
- Adjust sensitivity adjusting stud to eliminate hunting.
- Tighten the locknut.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- No load slightly under 131 volts
- Full load not below 115 volts
Full service-parts list: Cummins/Onan W3M-19 →
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.