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Home >> Infiniti >> 2006 >> QX56 AWD >> Repair and Diagnosis >> Transmission >> Transfer Case >> Transfer Assembly >> Disassembly and Assembly >> Disassembly >> Center Case

Center Case

  1. Remove the rear case assembly. Refer to "REAR CASE ".
  2. Remove the front case assembly. Refer to "FRONT CASE ".
  3. Hold the front drive shaft with one hand and tap to remove the front drive shaft with the drive chain.
    CAUTION: Do not tap drive chain.
    Fig 1: Removing Front Drive Shaft
    G04134133Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Remove the front drive shaft front bearing using Tools.

    Tool number A: ST33052000 ( - ) 

    B: ST30031000 ( - ) 

    Fig 2: Identifying Front Drive Shaft Front Bearing Using Tools
    G04134134Courtesy of NISSAN MOTOR CO., U.S.A.
  5. Remove the front drive shaft rear bearing using Tools.

    Tool number A: ST33052000 ( - ) 

    B: ST30031000 ( - ) 

    Fig 3: Identifying Front Drive Shaft Rear Bearing Using Tools
    G04134135Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Remove the neutral-4LO and ATP switches.
    Fig 4: Identifying Neutral - 4LO And ATP Switches
    G04134136Courtesy of NISSAN MOTOR CO., U.S.A.
  7. Remove the bolts and main oil pump cover.
    Fig 5: Identifying Bolts And Main Oil Pump Cover
    G04134137Courtesy of NISSAN MOTOR CO., U.S.A.
  8. Remove the outer gear, inner gear and main oil pump housing from the center case.
    Fig 6: Identifying Outer Gear, Inner Gear And Main Oil Pump Housing
    G04134138Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Remove the seal ring from the main oil pump cover.
    Fig 7: Identifying Seal Ring From Main Oil Pump Cover
    G04134139Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Remove the stem bleeder from the bleed hole.
    Fig 8: Identifying Stem Bleeder From Bleed Hole
    G04134140Courtesy of NISSAN MOTOR CO., U.S.A.
  11. Remove the snap ring and washer holder from the mainshaft.
    Fig 9: Identifying Snap Ring And Washer Holder From Mainshaft
    G04134141Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Remove the C-rings from the mainshaft using suitable tool.
    Fig 10: Identifying C-Rings From Mainshaft Using Suitable Tool
    G04134142Courtesy of NISSAN MOTOR CO., U.S.A.
  13. Set the center case on the press stand. Remove the mainshaft from the center case.
    Fig 11: Identifying Mainshaft From Center Case
    G04134143Courtesy of NISSAN MOTOR CO., U.S.A.
  14. Remove the snap ring from the mainshaft using suitable tool.
    Fig 12: Removing Snap Ring From Mainshaft Using Suitable Tool
    G04134144Courtesy of NISSAN MOTOR CO., U.S.A.
  15. Remove the thrust needle bearing from the press flange.
    Fig 13: Removing Thrust Needle Bearing From Press Flange
    G04134145Courtesy of NISSAN MOTOR CO., U.S.A.
  16. Press the press flange until the snap ring is out of place using Tools.

    Tool number A: ST22452000 (J-34335) 

    B: ST30911000 ( - ) 

    C: KV31103300 ( - ) 

    Fig 14: Pressing Flange
    G04134146Courtesy of NISSAN MOTOR CO., U.S.A.
  17. Remove the snap ring from the mainshaft using suitable tool.
    Fig 15: Removing Snap Ring From Mainshaft Using Suitable Tool
    G04134147Courtesy of NISSAN MOTOR CO., U.S.A.
  18. Remove the press flange from the mainshaft.
    Fig 16: Removing Press Flange From Mainshaft
    G04134148Courtesy of NISSAN MOTOR CO., U.S.A.
  19. Remove the return spring assembly from the clutch hub.
    Fig 17: Removing Return Spring Assembly From Clutch Hub
    G04134149Courtesy of NISSAN MOTOR CO., U.S.A.
  20. Remove each plate from the clutch drum.
    Fig 18: Removing Plate From Clutch Drum
    G04134150Courtesy of NISSAN MOTOR CO., U.S.A.
  21. Remove the snap ring from the mainshaft.
    Fig 19: Removing Snap Ring From Mainshaft
    G04134151Courtesy of NISSAN MOTOR CO., U.S.A.
  22. Remove the mainshaft from the clutch drum and clutch hub using suitable tool.
  23. Remove the needle bearing and spacer from the mainshaft.
    Fig 20: Identifying Mainshaft
    G04134152Courtesy of NISSAN MOTOR CO., U.S.A.
  24. Remove the snap ring from the clutch hub using suitable tool.
    Fig 21: Identifying Snap Ring From Clutch Hub Using Suitable Tool
    G04134153Courtesy of NISSAN MOTOR CO., U.S.A.
  25. Remove the oil pressure check plug from the oil pressure check port.
    Fig 22: Identifying Oil Pressure Check Plug
    G04134154Courtesy of NISSAN MOTOR CO., U.S.A.
  26. Apply air gradually from the oil pressure check port, and remove the clutch piston assembly from the center case.
    Fig 23: Removing Clutch Piston Assembly From Center Case
    G04134155Courtesy of NISSAN MOTOR CO., U.S.A.
  27. Remove the thrust needle bearing race from the clutch piston by hooking a edge into 3 notches of the thrust needle bearing race using suitable tool.
    CAUTION: Do not damage clutch piston or thrust needle bearing race.
    Fig 24: Removing Thrust Needle Bearing Race
    G04134156Courtesy of NISSAN MOTOR CO., U.S.A.
  28. Remove the two D-rings from the clutch piston.
    Fig 25: Removing D-Rings From Clutch Piston
    G04134157Courtesy of NISSAN MOTOR CO., U.S.A.
  29. Remove the mainshaft rear bearing from the center case using Tool.

    Tool number : KV38100300 (J-25523) 

    Fig 26: Removing Mainshaft Rear Bearing From Center Case Using Tool
    G04134158Courtesy of NISSAN MOTOR CO., U.S.A.
  30. Remove the two bolts and oil strainer.
    Fig 27: Removing Bolts And Oil Strainer
    G04134159Courtesy of NISSAN MOTOR CO., U.S.A.
  31. Remove the two O-rings from the oil strainer.
    Fig 28: Removing O-Rings From Oil Strainer
    G04134160Courtesy of NISSAN MOTOR CO., U.S.A.
  32. Remove the snap ring. Then push the connector assembly into the center case to remove the control valve assembly.
    Fig 29: Removing Snap Ring
    G04134161Courtesy of NISSAN MOTOR CO., U.S.A.
  33. Remove the control valve assembly bolts.
  34. Remove the control valve assembly.
    CAUTION:
    • Do not reuse any part that has been dropped or damaged.
    • Make sure valve is assembled in the proper direction.
    • Do not use a magnet because residual magnetism stays during disassembly.
      Fig 30: Removing Control Valve Assembly Bolts
      G04134162Courtesy of NISSAN MOTOR CO., U.S.A.
  35. Remove the lip seals from the center case.
    CAUTION: There are two kinds of lip seals (lip seal of large inner diameter: 5 pieces, lip seal of small inner diameter: 2 pieces). Confirm the position before disassembly.
    Fig 31: Removing Lip Seals From Center Case
    G04134163Courtesy of NISSAN MOTOR CO., U.S.A.
  36. Disassemble the control valve assembly with the following procedure.
    CAUTION:
    • Do not reuse any part that has been dropped or damaged.
    • Make sure valve is assembled in the proper direction.
    • Do not use a magnet because residual magnetism stays during disassembly.
    1. Remove all the bolts except for the two shown.
      Fig 32: Identifying Bolts
      G04134164Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Remove the following from the control valve assembly:
      • Clutch pressure solenoid valve
      • 2-4WD shift solenoid valve
      • Clutch pressure switch
      • Line pressure switch
      • Transfer fluid temperature sensor
        Fig 33: Identifying Clutch Pressure Solenoid Valve
        G04134165Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Remove the O-rings from each solenoid valve, switch and terminal body.
    4. Place the control valve with the lower body facing up. Remove the two bolts, and then remove the lower body and separator plate from the upper body.
      Fig 34: Identifying Lower Body And Separator Plate From Upper Body
      G04134166Courtesy of NISSAN MOTOR CO., U.S.A.
      CAUTION: Do not drop relief balls. Detach lower body carefully.
    5. Make sure the reverse balls, relief balls, relief springs, accumulator pistons and valve springs are securely installed as shown, and remove them.
      Fig 35: Identifying Valve Springs
      G04134167Courtesy of NISSAN MOTOR CO., U.S.A.
    6. Remove the retainer plates.
      Fig 36: Identifying Retainer Plates
      G04134168Courtesy of NISSAN MOTOR CO., U.S.A.
    7. Remove each control valve, spring and plug.
      Fig 37: Identifying Control Valve, Spring And Plug
      G04134169Courtesy of NISSAN MOTOR CO., U.S.A.
  37. Remove the transfer motor bolts and motor from the center case. Then remove the O-ring from the transfer motor.
    Fig 38: Identifying Transfer Motor Bolts And Motor
    G04134170Courtesy of NISSAN MOTOR CO., U.S.A.
  38. Remove the sub oil pump cover bolts.
    Fig 39: Identifying Sub Oil Pump Cover Bolts
    G04134171Courtesy of NISSAN MOTOR CO., U.S.A.
  39. Thread two bolts (M4 x 0.8) into the holes of sub oil pump cover as shown, and pull out to remove the sub oil pump assembly.
    Fig 40: Removing Bolts
    G04134172Courtesy of NISSAN MOTOR CO., U.S.A.
  40. Remove the outer gear and inner gear from the sub oil pump housing.
    Fig 41: Identifying Outer Gear And Inner Gear
    G04134173Courtesy of NISSAN MOTOR CO., U.S.A.
  41. Remove the oil filter bolts and oil filter.
    Fig 42: Identifying Oil Filter Bolts And Oil Filter
    G04134174Courtesy of NISSAN MOTOR CO., U.S.A.
    CAUTION:
    • Do not damage center case and oil filter.
    • Loosen bolts and detach oil filter evenly.
  42. Remove the O-rings (1) from the oil filter (2).
    Fig 43: Identifying O-Rings From Oil Filter
    G04134175Courtesy of NISSAN MOTOR CO., U.S.A.
  43. Remove the oil filter stud from the oil filter.
  44. Remove the O-ring from the oil filter stud.
    Fig 44: Identifying O-Ring From Oil Filter Stud
    G04134176Courtesy of NISSAN MOTOR CO., U.S.A.
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