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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 4L80-E/4L85-E - Overhaul >> Repair Instructions >> Control Valve Body Cleaning and Inspection

Control Valve Body Cleaning and Inspection

    NOTE: Do not reuse cleaning solvents. Previously used solvents may deposit sediment which may damage the component.
    Fig 1: Cleaning Control Valve Body
    GM40623Courtesy of GENERAL MOTORS CORP.
  1. Clean the control valve body (301) in clean solvent.
  2. Dry the control valve body (301) using compressed air.
  3. Inspect the control valve body casting for the following conditions:
    • Porosity
    • Cracks
    • Interconnected passages
    • Damaged machined surfaces