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Home >> Infiniti >> 2007 >> 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: Holding Front Drive Shaft With Drive Chain
    G04901648
  4. Remove the front drive shaft front bearing using Tools.

    Tool number A: ST33052000 ( - ) 

    B: ST30031000 ( - ) 

    Fig 2: Identifying Front Drive Shaft Front Bearing
    G04901649
  5. Remove the front drive shaft rear bearing using Tools.

    Tool number A: ST33052000 ( - ) 

    B: ST30031000 ( - ) 

    Fig 3: Identifying Front Drive Shaft Rear Bearing
    G04901650
  6. Remove the neutral-4LO and ATP switches.
    Fig 4: Identifying Neutral-4LO And ATP Switches
    G04901651
  7. Remove the bolts and main oil pump cover.
    Fig 5: Locating Main Oil Pump Cover To Center Case Bolts
    G04901652
  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 From Center Case
    G04901653
  9. Remove the seal ring from the main oil pump cover.
    Fig 7: Applying ATF To New Seal Ring
    G04901654
  10. Remove the stem bleeder from the bleed hole.
    Fig 8: Applying Petroleum Jelly To Stem Bleeder
    G04901655
  11. Remove the snap ring and washer holder from the mainshaft.
    Fig 9: Identifying Snap Ring And Washer Holder From Mainshaft
    G04901656
  12. Remove the C-rings from the mainshaft using suitable tool.
    Fig 10: Identifying C-Rings
    G04901657
  13. Set the center case on the press stand. Remove the mainshaft from the center case.
    Fig 11: Identifying Mainshaft From Center Case
    G04901658
  14. Remove the snap ring from the mainshaft using suitable tool.
    Fig 12: Identifying Snap Ring
    G04901659
  15. Remove the thrust needle bearing from the press flange.
    Fig 13: Applying ATF To Thrust Needle Bearing And Install It On Press Flange
    G04901660
  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
    G04901661
  17. Remove the snap ring from the mainshaft using suitable tool.
    Fig 15: Removing Snap Ring
    G04901662
  18. Remove the press flange from the mainshaft.
    Fig 16: Identifying Press Flange From Mainshaft
    G04901663
  19. Remove the return spring assembly from the clutch hub.
    Fig 17: Removing Return Spring Assembly Into Clutch Hub
    G04901664
  20. Remove each plate from the clutch drum.
    Fig 18: Removing Plate From Clutch Drum
    G04901665
  21. Remove the snap ring from the mainshaft.
    Fig 19: Identifying Snap Ring
    G04901666
  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 From Clutch Drum And Clutch Hub
    G04901667
  24. Remove the snap ring from the clutch hub using suitable tool.
    Fig 21: Identifying Snap Ring To Clutch Hub
    G04901668
  25. Remove the oil pressure check plug from the oil pressure check port.
    Fig 22: Identifying Oil Pressure Check Plug From Oil Pressure Check Port
    G04901669
  26. Apply air gradually from the oil pressure check port, and remove the clutch piston assembly from the center case.
    Fig 23: Identifying Clutch Piston Assembly From Center Case
    G04901670
  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: Identifying Thrust Needle Bearing Race From Clutch Piston
    G04901671
  28. Remove the two D-rings from the clutch piston.
    Fig 25: Identifying D-Rings From Clutch Piston
    G04901672
  29. Remove the mainshaft rear bearing from the center case using Tool.

    Tool number : KV38100300 (J-25523) 

    Fig 26: Identifying Mainshaft Rear Bearing From Center Case
    G04901673
  30. Remove the two bolts and oil strainer.
    Fig 27: Identifying Bolts And Oil Strainer
    G04901674
  31. Remove the two O-rings from the oil strainer.
    Fig 28: Applying ATF To O-Rings
    G04901675
  32. Remove the snap ring. Then push the connector assembly into the center case to remove the control valve assembly.
    Fig 29: Identifying Snap Ring
    G04901676
  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: Locating Control Valve Assembly Bolts
      G04901677
  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: Applying ATF To Lip Seals
    G04901678
  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: Locating Control Valve Assembly Bolts
      G04901679
    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
    3. Remove the O-rings from each solenoid valve, switch and terminal body.
      Fig 33: Identifying Clutch Pressure Solenoid Valve And Clutch Pressure Switch
      G04901680
    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.
      CAUTION: Do not drop relief balls. Detach lower body carefully.
      Fig 34: Placing Control Valve With Lower Body Facing Up
      G04901681
    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 Reverse Balls, Relief Balls, Relief Springs, Accumulator Pistons And Valve Springs
      G04901682
    6. Remove the retainer plates.
      Fig 36: Locating Retainer Plates
      G04901683
    7. Remove each control valve, spring and plug.
      Fig 37: Identifying Control Valve, Spring And Plug
      G04901684
  37. Remove the transfer motor bolts and motor from the center case. Then remove the O-ring from the transfer motor.
    Fig 38: Locating Transfer Motor Bolts
    G04901608
  38. Remove the sub oil pump cover bolts.
    Fig 39: Locating Sub Oil Pump Cover Bolts
    G04901686
  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 Sub Oil Pump Assembly Bolts
    G04901687
  40. Remove the outer gear and inner gear from the sub oil pump housing.
    Fig 41: Identifying Outer Gear And Inner Gear Into Sub Oil Pump Housing
    G04901688
  41. Remove the oil filter bolts and oil filter.
    CAUTION:
    • Do not damage center case and oil filter.
    • Loosen bolts and detach oil filter evenly.
      Fig 42: Identifying Oil Filter And Oil Filter
      G04901615
  42. Remove the O-rings (1) from the oil filter (2).
    Fig 43: Applying ATF To O-Rings
    G04901611
  43. Remove the oil filter stud from the oil filter.
  44. Remove the O-ring from the oil filter stud.
    Fig 44: Identifying Oil Filter Stud To Oil Filter
    G04901612
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