Generac NP-66G — Out of Service Protection

Maintenance · Generator

For the Generac NP-66G, from the Generac owner's manual.

Applies to: Generac NP-66G, Generac GN-480 engine

Procedure

1. Start the engine and let it warm up.
2. Close the fuel shutoff valve in the fuel supply line and let the engine run out of gas.
3. While still warm, drain the oil completely and refill crankcase with SAE 10W-30 API SF oil.
4. Attach a tag to the engine indicating oil viscosity and classification.
5. Remove spark plugs and pour two or three tablespoons of clean engine oil into openings; crank engine and reinstall plugs.
6. Remove battery and store in a cool, dry room on a wooden board; never store on a concrete floor.
7. Clean and wipe the entire generator.

Full service-parts list: Generac NP-66G →

Source: Generac 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.

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