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Generac — Return to Service

Maintenance · Generator storage

From a Generac owner's manual — check it applies to your exact model before use.

Applies to: Generac GH-410 engine, Generac GT-530 engine, Generac GT-990 engine, Generac GT-999 engine

Before you start

  • Damage may occur if the battery is connected incorrectly.

Procedure

  1. Verify that utility power is turned off and that the AUTO/OFF/MANUAL switch is set to OFF.
  2. Check the tag on the engine for oil viscosity and classification.
  3. Verify that the correct recommended oil is used in the engine.
  4. Check the state of the battery and recharge or replace as needed.
  5. Clean and wipe the entire generator.
  6. Make sure the 7.5A fuse is removed from the generator control panel.
  7. Reconnect the battery, observing polarity.
  8. Open the fuel shutoff valve.
  9. Insert the 7.5A fuse into the generator control panel.
  10. Start the unit by moving the AUTO/OFF/MANUAL switch to MANUAL and allow it to warm up thoroughly.
  11. Stop the unit by setting the AUTO/OFF/MANUAL switch to OFF.
  12. Turn on the utility power to the transfer switch.
  13. Set the AUTO/OFF/MANUAL switch to AUTO.

Specs & values

  • 7.5A fuse
  • Recharge battery to 100 percent state of charge

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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