Generac — Return to Service After Storage
Maintenance · Engine/Generator
From a Generac service manual covering: GN-190, GN-220, NP-30G, NP-40G. Check it applies to your exact model before use.
Applies to: Generac NP-30G, Generac GN-190 / GN-220 engine, Generac GN-220 engine
Procedure
- Verify correct oil is in the crankcase by checking the tag; if necessary drain and refill with recommended oil.
- Check the battery; fill all cells to proper level with distilled water (DO NOT USE TAP WATER).
- Recharge the battery to a 100 percent state of charge or replace if defective.
- Turn OFF all electrical loads; start the engine at no-load and let it warm up.
- Apply electrical loads to at least 50% of the unit's rated capacity.
- When thoroughly warmed up, turn off or disconnect all electrical loads, then shut the engine down.
Full service-parts list: Generac NP-30G →
Source: Generac service 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.