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Generac NP-66G — Returning Unit to Service After Storage

Maintenance · Generator

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

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

Before you start

  • DO NOT USE TAP WATER IN THE BATTERY

Procedure

  1. Check tag on engine for oil viscosity and classification; drain and refill with proper oil if needed.
  2. Check battery; fill cells with distilled water and recharge to 100% state of charge or replace.
  3. Turn OFF all electrical loads, add gasoline if necessary, then start the engine.
  4. Let engine warm up.
  5. Apply electrical loads to at least 50% of rated wattage capacity.
  6. When engine is thoroughly warmed up, shut it down.

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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