Cummins/Onan — Returning the Unit After Extended Out-Of-Service Periods
Maintenance · Complete plant
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
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Before you start
- Long storage periods may cause the oil pump to lose its prime - check oil pressure immediately.
Procedure
- Remove all protective coatings of grease from external parts and wipe the unit clean.
- Remove all the masking tape.
- Remove, clean and adjust spark plugs; crank to distribute oil over cylinder walls.
- Examine all fuel, oil and water lines and connections; service as needed.
- Refill the cooling system with clean, fresh water or a 50-50 antifreeze solution.
- Refill the crankcase and air cleaner with the correct amount and grade of oil.
- Check carefully for leaks of water, fuel or oil before starting.
- Connect the battery cables, ground cable last, and check oil pressure immediately on initial start.
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.