Generac — Remove From Service (storage)
Maintenance · generator
From a Generac owner's manual covering: GH-426, GT-999, GTH-530. Check it applies to your exact model before use.
Applies to: Generac GH-426 engine, Generac GTH-530 engine, Generac GT-999 engine
Procedure
- Start the engine and let it warm up.
- Close the fuel shutoff valve in the fuel supply line and allow the engine to stop.
- Set the generator MLCB (generator disconnect) to OFF (OPEN).
- Turn off the utility power to the transfer switch.
- Remove battery charger AC input T1/Neutral cable at controller.
- Remove the 7.5 amp fuse from the control panel.
- Disconnect the battery cables, negative cable first.
- Drain the oil completely while engine is still warm, then refill the crankcase with oil.
- Attach a tag to the engine indicating the viscosity and classification of the new oil.
- Remove spark plug(s) and spray a fogging agent into the threaded openings; reinstall and tighten to spec.
- Remove the battery and store in a cool, dry room on a wooden board.
- Clean and wipe down the entire generator.
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.