Cummins/Onan — Preparing Units for Storage
Maintenance · generating plant
From a Cummins/Onan owner's manual covering: 10HQ, 10HQ-150R, 15HQ, 15HQ-150R, 15HQ-4R30. Check it applies to your exact model before use.
Applies to: Cummins/Onan 10HQ, Cummins/Onan 10HQ-150R, Cummins/Onan 15HQ, Cummins/Onan 15HQ-150R, Cummins/Onan 15HQ-4R30, Continental F162 engine
Procedure
- Shut off fuel supply at tank and run unit until it stops.
- Fill fuel tank nearly full to lessen condensation.
- Drain oil while warm; replace drain plug and attach warning tag.
- Drain entire cooling system if no antifreeze/rust inhibitor is present.
- Pour two tablespoonfuls of rust inhibitor oil (SAE 50) into each cylinder and crank slowly by hand.
- Clean generator brushes, holders, commutator and collector rings with a clean cloth.
- Remove, clean and replace air cleaner; coat exposed parts with grease; plug exhaust outlet.
- Remove batteries or disconnect cables; provide a cover for the unit.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Protect any unit out of service 30 days or more
Full service-parts list: Cummins/Onan 10HQ →, Cummins/Onan 10HQ-150R →, Cummins/Onan 15HQ →, Cummins/Onan 15HQ-150R →, Cummins/Onan 15HQ-4R30 →, Continental F162 engine →
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.