Cummins/Onan — Voltage Adjustment (Standard Regulator)
Adjustments · Voltage regulator VR21
From a Cummins/Onan service manual covering: DL4, DL6, DL6T, DL6U. Check it applies to your exact model before use.
Applies to: Cummins/Onan DL4, Cummins/Onan DL6, Cummins/Onan DL6T
Procedure
- Center the panel mounted voltage adjustment knob with pointer vertical.
- Start the set and allow it to stabilize at correct frequency and speed.
- Turn R18 counterclockwise to decrease voltage or clockwise to increase.
- Set voltage with no load connected (e.g., 246 volts for 120/240).
- Turn R26 counterclockwise until unstable, then clockwise until voltage stabilizes.
Specs & values
- Set no-load voltage for 246 volts on a 120/240-volt connection
Full service-parts list: 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.