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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 133 (Automatic Transmission - 4L80-E/4L85-E - Introduction (2 Of 2)) >> Repair Instructions >> Repair Instructions - Off Vehicle >> Forward Clutch Assembly Disassemble

Forward Clutch Assembly Disassemble

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

    Fig 1: View Of Direct Clutch Hub & Forward Clutch Components
    GM31063Courtesy of GENERAL MOTORS CORP.
  1. Remove the direct clutch hub retainer ring (616).
  2. Remove the direct clutch hub (615).
  3. Remove the direct clutch housing thrust washer (614) (plastic).
  4. Remove the forward clutch hub (613).
  5. Remove the forward clutch housing thrust washer (612) (bronze). The washer may stick to the forward clutch housing assembly (602).
  6. Inspect the direct clutch hub (615) for the following:
    • Spline wear
    • Open lubrication holes
    • A damaged clutch surface
    7. Fig 2: Identifying Forward Clutch Steel & Composite Plates Inspection Areas
    GM54636Courtesy of GENERAL MOTORS CORP.
  7. Remove the forward clutch steel and composite plates (610, 611).
  8. Remove the forward clutch (waved) plate (609).
  9. Inspect the forward clutch plates (609-611) for the following:
    • Burning
    • Scoring
    • Flaking
    • Pitting
    • Wear
    10. Fig 3: Locating Inspection Areas On Forward Clutch Spring Assembly
    GM31066Courtesy of GENERAL MOTORS CORP.
  10. Using the J 23327  and the J 25018-A  , compress the forward clutch spring assembly (607). See Special Tools .
  11. Remove the forward clutch spring retainer ring (608).
  12. Remove the tools.
  13. Remove the forward clutch spring assembly (607).
  14. Inspect the forward clutch spring assembly (607) for collapsed spring coils and distortion.
    15. Fig 4: Inspection Areas On Forward Clutch Piston Assembly
    GM54642Courtesy of GENERAL MOTORS CORP.
  15. Remove the forward clutch piston assembly (606). The forward clutch piston assembly is reusable if it is not damaged.
  16. Inspect the forward clutch piston assembly (606) for cracks.
  17. Inspect the seal on the forward clutch piston assembly (606) for cuts, tears, and nicks.
    18. IMPORTANT: The forward clutch piston intermediate seal assembly (685) is reusable. Replace the forward clutch housing assembly (602) if the seal is worn or damaged.
  18. Inspect the forward clutch piston intermediate seal assembly (685) for cuts, tears, and nicks.
  19. Inspect the forward clutch housing assembly (602) for the following:
    • Wear
    • Restricted/Clogged oil passages
    • Damaged thrust faces
    • Free movement of checkball (rattles)
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