Cummins/Onan — Calibrate electronic governor
Adjustments
From a Cummins/Onan service manual covering: 4A2.3, 6A3.4-GS, 6AT3.4-GS, DL4, DL6, QSA3, QSA4, QSA6. Check it applies to your exact model before use.
Applies to: Cummins/Onan DGAB, Cummins/Onan DGAC, Cummins/Onan DGAD, Cummins/Onan DGAE, Cummins/Onan DL4, Cummins/Onan DL6
Before you start
- Keep hands and fingers clear while performing tests on operating equipment.
Procedure
- Check actuator linkage does not bind through full travel.
- Attach tachometer or frequency meter.
- Set GAIN adjustment to second mark from zero.
- Disconnect governor rod from throttle lever.
- Start genset and adjust right stop to 72 Hz for 60 Hz gensets.
- Adjust left stop to take up slack and tighten locknut.
- Stop, attach governor rod, start, and adjust SPEED to 60 or 50 Hz.
- Connect load and adjust GAIN clockwise until stable.
Tools required
- Tachometer or frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Terminals 7 and 8 must be jumpered before adjusting controller.
Full service-parts list: Cummins/Onan DGAB →, Cummins/Onan DGAC →, Cummins/Onan DGAD →, Cummins/Onan DGAE →, Cummins/Onan DL6 →
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.