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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 53 (Transfer Case - NVG 246-NP8 - Overhaul) >> Repair Instructions >> Cleaning and Inspection >> Clutch Components

Clutch Components

WARNING: This page is about a different variant/trim than selected.
  1. Do not clean the inner clutch discs (1) in cleaning solvent.
    Fig 1: Identifying Inner & Outer Clutch Discs
    GM1490799Courtesy of GENERAL MOTORS CORP.
  2. Inspect the inner clutch discs (1) with the friction material for the following conditions:
    • Worn friction material
    • Grooved or scored friction material
    • Warped
    • Burnt
  3. Inspect the outer clutch discs (2) steel plates for being worn or warped. If the discs show wavy wear marks, the discs are faulty.
  4. Replace the clutch discs if any of the above conditions are found.
  5. Clean the clutch pressure plate (3), the clutch pressure plate bearing (2) and the clutch pressure plate hub (1) in cleaning solvent and air dry.
  6. Inspect the pressure plate bearing (2) for the following conditions:
    • Roughness
    • Brinelling
    • Pitting
    • Broken bearing cage
    • Fig 2: Inspecting Inner Clutch Components
      GM1577183Courtesy of GENERAL MOTORS CORP.
  7. Replace the pressure plate bearing if it is damaged or worn.
  8. Inspect the clutch pressure plate (3) for wear or damage.
  9. Replace a faulty clutch pressure plate.
  10. Inspect the clutch pressure plate bearing hub (1) for wear or damage.
  11. Replace a faulty clutch pressure plate bearing hub.
  12. Inspect for a damaged clutch return spring (4).
  13. Replace a faulty clutch spring.
  14. Clean the clutch housing, with the bearing, in cleaning solvent.
  15. Air dry and ensure all solvent is removed from the bearing.
  16. Inspect the bearing for wear or damage.
  17. Replace the clutch housing bearing if faulty. Refer to Transfer Case Disassemble  and Transfer Case Assemble .
  18. Inspect the clutch housing disc teeth for burrs or excessive wear. Excessive wear is identified by the steps in the teeth, which prevents the clutch disc from moving freely.
    Fig 3: Inspecting Clutch Housing
    GM765988Courtesy of GENERAL MOTORS CORP.
  19. Remove any burrs from the clutch housing disc teeth.
  20. Replace the clutch housing if the clutch disc teeth cannot be deburred.
  21. Clean the clutch hub in cleaning solvent and air dry.
    Fig 4: Locating Clutch Hub Inspection Areas
    GM1348900Courtesy of GENERAL MOTORS CORP.
  22. Inspect the clutch disc surface (3) for excessive wear, warpage, or grooves.
  23. Inspect the rear output shaft to the clutch inner hub splines (1) for excessive looseness.
  24. Inspect the clutch hub teeth (4) for excessive wear. Steps in the teeth can identify excessive wear, which prevents the clutch disc from moving freely.
  25. Inspect the clutch pressure plate tab slots (2) for excessive wear.
  26. Replace the clutch hub if any of the above conditions are found.