Cummins/Onan — Locking the Generator Set Out of Service
Maintenance
From a Cummins/Onan service manual covering: C25 D6, C30 D6, C35 D6, C40 D6, C50 D6, C60 D6. Check it applies to your exact model before use.
Applies to: Cummins/Onan C25 D6, Cummins/Onan C30 D6, Cummins/Onan C35 D6, Cummins/Onan C40 D6, Cummins/Onan C50 D6, Cummins/Onan C60 D6, Cummins/Onan 4BT3.3 engine, Cummins/Onan 4BT3.3-G5 engine, Cummins/Onan 4BT3.3-G7 engine
Before you start
- Accidental or remote starting of the generator set can cause severe personal injury or death.
Procedure
- Press Off switch, then press E-Stop button.
- Thoroughly ventilate the generator set before disconnecting any leads.
- Turn off and disconnect the heater (where fitted) from AC source.
- Turn off and disconnect the battery charger (where fitted) from AC source.
- Turn off the fuel supply to the engine.
- Disconnect the battery negative cable first using an insulated wrench.
- Place warning notices at each location.
Tools required
- Insulated wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan C25 D6 →, Cummins/Onan C35 D6 →, Cummins/Onan C50 D6 →, Cummins/Onan C60 D6 →
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.