Cummins/Onan — Returning an Out-of-Service Set to Service
Maintenance · Generator set
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan YD series, Cummins/Onan J block (Series JB/JC) engine
Procedure
- Unplug the exhaust and remove the protective cover.
- Change the oil if the viscosity grade recorded on the tag is not suitable for the current ambient temperature.
- Service the battery and connect it (negative [-] cable last).
- See Operation for starting and operating the set.
Full service-parts list: Cummins/Onan YD series →
Source: Cummins/Onan owner's 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.