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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Transmission >> Transfer Case - BW 4484 >> Repair Instructions - Off Vehicle >> Transfer Case Cleaning and Inspection >> Mainshaft

Transfer Case Cleaning and Inspection: Mainshaft

    Fig 1: Identifying Mainshaft Inspection Areas
    GM819673Courtesy of GENERAL MOTORS CORP.
  1. Clean the mainshaft in cleaning solvent.
  2. Clean the mainshaft oil galleries (1) and air dry.
    3. IMPORTANT: Do not attempt to smooth any roughness in the bearing journals.
  3. Inspect the bearing journals on the mainshaft for the following conditions:
    • The front support bearing (2)
    • The drive gear bushing (4)
    • The front sun gear (5)
    • The rear support bushing (6)
      • Scoring
      • Pitting
      • Brinelling
      • Excessive wear
  4. Inspect the mainshaft range collar splines (3) for damage or excessive wear. Witness marks at the location of the gear is normal.
  5. Replace the mainshaft if any of the above conditions are found.
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