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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 52 (Transfer Case - NVG 149-NP3 - Overhaul) >> Repair Instructions >> Cleaning and Inspection >> Sun Gear and Annulus Gear

Sun Gear and Annulus Gear

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  1. Clean the sun gear (2) and the annulus gear (1) in cleaning solvent and air dry.
    Fig 1: Sun Gear and Annulus Gear
    GM805658Courtesy of GENERAL MOTORS CORP.
  2. Inspect the annulus gear (1) for the following conditions:
    • Damage or wear
    • Chipped gear teeth
    • Debris embedded in the root of the teeth
  3. Replace the annulus gear if any of the above conditions are found.
  4. Inspect the sun gear teeth for the following conditions:
    • Damage or wear
    • Chipped gear teeth
    • Debris embedded in the root of the teeth
  5. Inspect the planetary sun gear bearing journal in the sun gear for the following conditions:
    • Roughness
    • Brinelling
    • Pitting
  6. Inspect the sun gear thrust surfaces for scoring or roughness.
  7. Replace the sun gear if any of the above conditions are found.
  8. Inspect the planetary carrier sun gear thrust washer for scoring or wear.
  9. Replace the thrust washer if it is faulty.