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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 131 (Transfer Case - NVG 246-NP8) >> Repair Instructions >> Cleaning and Inspection >> Front Case Half

Front Case Half

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    Fig 1: View Of Inspection Areas On Front Case Half
    GM801254Courtesy of GENERAL MOTORS CORP.
  1. Clean the front case half in cleaning solvent and air dry.
    2. NOTE: Refer to Machined Surface Damage Notice .
  2. Remove the sealer from the case sealing surfaces.
  3. Inspect the case for being broken or cracked.
  4. Inspect the front output shaft front bearing bore (8) for the following conditions:
    • Spun bearing
    • Cracks
  5. Inspect the input shaft bearing bore (5) for the following conditions:
    • Spun bearing
    • Cracks
  6. Replace the front case half if any of the above conditions are found.
  7. Inspect the sealing surfaces (1) for damage.
  8. Repair small scratches or nicks with a soft stone.
  9. Inspect the front case to transmission case mounting surface for damage.
  10. Inspect the case threaded bolt holes (2) for damage.
  11. Repair any damaged threads.
  12. Inspect the transmission to transfer case studs (4) for damage.
  13. Replace any damaged studs. Refer to Transfer Case Assemble .
  14. Inspect the retaining ring (3) of the annulus gear to ensure it is properly seated.
  15. Inspect the annulus gear (6) for the following conditions:
    • Damage or wear
    • Chipped gear teeth
    • Debris embedded in the root of the teeth
  16. Replace the front case half if the annulus gear is damaged. The annulus gear is serviced only with the front case half.
  17. Inspect the control actuator lever shaft bearing and seal (7) for the following conditions:
    • Roughness
    • Pitted rollers
    • Seal torn or damaged
    • Missing rollers
  18. Replace the control actuator lever shaft bearing if it is faulty. Refer to Transfer Case Disassemble  and Transfer Case Assemble .
  19. Inspect the location pins for being loose or missing.
  20. Repair or replace any damaged location pins.
  21. Inspect the front output shaft front bearing and the input shaft bearing for the following conditions:
    • Roughness
    • Brinelling
    • Pitting
  22. Replace the bearings if any of the above conditions are found. Refer to Transfer Case Disassemble  and Transfer Case Assemble .
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