Cummins/Onan — Genset Storage (inactive more than 30 days)
Maintenance
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA
Before you start
- Crankcase pressure can blow out hot oil and cause severe burns. Stop the engine before checking the oil level or opening the fill cap.
- Hot coolant is under pressure and can cause severe burns when loosening the pressure cap.
- Arcing at battery terminals can ignite battery gas; disconnect the negative (−) cable first and reconnect it last.
Procedure
- Run the genset until thoroughly warmed up and shut it down.
- Change the oil and oil filter while still warm and attach a tag to the dip stick indicating the oil viscosity grade.
- Disconnect the battery cables (negative [−] cables first) and store the battery(ies) per the manufacturer's recommendations.
- Check the coolant level and add coolant as necessary; test the coolant mixture if freezing temperatures are possible.
- Clean the genset and lightly oil parts that can rust.
Full service-parts list: Cummins/Onan HDKA →
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.