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Generac GT-990 — Out of Service Procedure - Removal From Service

Maintenance · Generator

For the Generac GT-990, from the Generac owner's manual.

Applies to: Generac GT-990 engine

Before you start

  • Never store the battery on any concrete or earthen floor.

Procedure

  1. Start the engine and let it warm up.
  2. Close the fuel shutoff valve in the fuel supply line and allow the unit to shut down.
  3. Set the AUTO/OFF/MANUAL switch to OFF, turn off utility power, remove the 7.5A and 15A fuses, and disconnect battery cables.
  4. While engine is still warm, drain the oil completely and refill the crankcase.
  5. Attach a tag to the engine indicating oil viscosity and classification.
  6. Remove spark plug(s) and spray fogging agent into the openings; reinstall and tighten.
  7. Remove the battery and store it in a cool, dry room on a wooden board.
  8. Clean and wipe 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.

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