Cummins/Onan 3100 series — Adjusting Gas Regulator For NG Pressure
Adjustments
For the Cummins/Onan 3100 series, from the Cummins/Onan service manual.
Applies to: Cummins/Onan GGKD
Before you start
- High gas supply pressure can cause gas leaks which can lead to fire and severe personal injury or death.
Procedure
- Install the manometers into the two test ports of the gas regulator.
- Remove the regulator dust cap.
- Start the genset and run at full load.
- Turn the adjusting screw until the meter shows the appropriate gas pressure for NG on the mixer side.
- Turn the screw clockwise to increase pressure.
Tools required
- Manometers Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- NG mixer side pressure 4 to 6 inches WC at full load
Full service-parts list: Cummins/Onan GGKD →
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.