Cummins/Onan — Voltage Adjustment
Adjustments · Generator output voltage
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDKAV, Cummins/Onan MDKAW, Cummins/Onan MDKAZ, Cummins/Onan MDKB, Kubota D1105 engine, Kubota V1305 engine, Kubota V1505 engine, Kubota V1903B engine, Kubota V2203B engine, Kubota V2803B engine
Before you start
- HAZARDOUS VOLTAGE! Touching uninsulated live parts inside the genset or connected equipment can result in severe personal injury or death.
Procedure
- Make proper fuel, exhaust, raw water and battery connections; ensure proper oil and coolant levels.
- Disconnect all generator loads and connect meters to measure AC volts and frequency.
- Start the genset and let voltage and frequency stabilize for 5 to 10 seconds.
- Rapidly press the control switch to START 6 times within 10 seconds.
- To raise voltage, press START and release quickly; each release raises voltage about 0.6 volt.
- To lower voltage, press START and release in about 2 seconds; each release lowers voltage about 0.6 volt.
- Normal operation resumes 20 seconds after the last adjustment.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Voltage change approximately 0.6 volt per press
- Resume normal mode 20 seconds after last adjustment
Full service-parts list: Cummins/Onan MDKAV →, Cummins/Onan MDKAW →, Cummins/Onan MDKAZ →, Cummins/Onan MDKB →, Kubota D1105 engine →, Kubota V1305 engine →, Kubota V1903B engine →
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.