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Home >> Infiniti >> 2005 >> 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 One Hand And Tapping To Remove Front Drive Shaft With Drive Chain
    G02383224Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Remove the front drive shaft front bearing, using Tools.
    1. Tool number A: ST33052000 ( - ) 
      1. B:ST30031000( - ) 
    Fig 2: Removing Front Drive Shaft Front Bearing Using Specified Tools
    G02383225Courtesy of NISSAN MOTOR CO., U.S.A.
  5. Remove the front drive shaft rear bearing, using Tools.
    1. Tool number A: ST33052000 ( - ) 
      1. B:ST30031000( - ) 
    Fig 3: Removing Front Drive Shaft Rear Bearing Using Specified Tools
    G02383226Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Remove the neutral-4LO and ATP switches.
    Fig 4: Identifying Neutral-4LO And ATP Switches
    G02383227Courtesy of NISSAN MOTOR CO., U.S.A.
  7. Remove the bolts and main oil pump.
    Fig 5: Identifying Mainshaft And Bolts
    G02383228Courtesy of NISSAN MOTOR CO., U.S.A.
  8. Remove the outer gear and inner gear from the main oil pump housing.
    Fig 6: Removing Outer Gear And Inner Gear From Main Oil Pump Housing
    G02383229Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Remove the seal ring from the main oil pump cover.
    Fig 7: Identifying Seal Ring
    G02383230Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Remove the stem bleeder from the bleed hole.
    Fig 8: Identifying Stem Bleeder
    G02383231Courtesy of NISSAN MOTOR CO., U.S.A.
  11. Remove the snap ring and washer holder from the mainshaft.
    Fig 9: Identifying Snap Ring, Washer Holder And Mainshaft
    G02383232Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Remove the C-rings from the mainshaft, using suitable tool.
    Fig 10: Removing C-Rings From Mainshaft Using Suitable Tool
    G02383233Courtesy 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: Removing Mainshaft From Center Case
    G02383234Courtesy 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
    G02383235Courtesy of NISSAN MOTOR CO., U.S.A.
  15. Remove the thrust needle bearing from the press flange.
    Fig 13: Identifying Thrust Needle Bearing And Press Flange
    G02383236Courtesy of NISSAN MOTOR CO., U.S.A.
  16. Press the flange until the snap ring is out of place, using Tools.
    1. Tool number A: ST22452000 (J-34335) 
      1. B:ST30911000( - ) 
      2. C: KV31103300 ( - ) 
    Fig 14: Pressing Flange Until Snap Ring Is Out Of Place, Using Specified Tools
    G02383237Courtesy 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
    G02383238Courtesy of NISSAN MOTOR CO., U.S.A.
  18. Remove the press flange from the mainshaft.
    Fig 16: Identifying Press Flange
    G02383239Courtesy of NISSAN MOTOR CO., U.S.A.
  19. Remove the return spring assembly from the clutch hub.
    Fig 17: Identifying Return Spring Assembly
    G02383240Courtesy of NISSAN MOTOR CO., U.S.A.
  20. Remove each plate from the clutch drum.
    Fig 18: Identifying Clutch Drum
    G02383241Courtesy of NISSAN MOTOR CO., U.S.A.
  21. Remove the snap ring from the mainshaft.
    Fig 19: Identifying Snap Ring And Mainshaft
    G02383242Courtesy 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: Removing Mainshaft From Clutch Drum And Clutch Hub, Using Suitable Tool
    G02383243Courtesy of NISSAN MOTOR CO., U.S.A.
  24. Remove the snap ring from the clutch hub, using suitable tool.
    Fig 21: Removing Snap Ring From Clutch Hub Using Suitable Tool
    G02383244Courtesy 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
    G02383245Courtesy 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: Applying Air From Oil Pressure Check Port, And Removing Clutch Piston Assembly From Center Case
    G02383246Courtesy 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 Using Suitable Tool
    G02383247Courtesy of NISSAN MOTOR CO., U.S.A.
  28. Remove the two D-rings from the clutch piston.
    Fig 25: Identifying D-Rings
    G02383248Courtesy of NISSAN MOTOR CO., U.S.A.
  29. Remove the mainshaft rear bearing from the center case, using Tool.
    1. Tool number: KV38100300 (J-25523) 
    Fig 26: Removing Mainshaft Rear Bearing From Center Case Using Tool (KV38100300)
    G02383249Courtesy of NISSAN MOTOR CO., U.S.A.
  30. Remove the two bolts and oil strainer.
    Fig 27: Identifying Oil Strainer And Bolts
    G02383250Courtesy 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
    G02383251Courtesy 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: Identifying Snap Ring
    G02383252Courtesy 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: Identifying Control Valve Assembly Bolts
    G02383253Courtesy 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: Identifying Large And Small Lip Seals
    G02383254Courtesy 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 Control Valve Assembly Components (1 Of 2)
      G02383255Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Remove the following from the control valve assembly:
      • Clutch pressure solenoid valve
      • Clutch pressure switch
      • 2-4WD shift solenoid valve
      • Line pressure switch
      • Transfer fluid temperature sensor
    3. Remove the O-rings from each solenoid valve, switch and terminal body.
      Fig 33: Identifying Control Valve Assembly Components (2 Of 2)
      G02383256Courtesy of NISSAN MOTOR CO., U.S.A.
    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: Identifying Lower Body, Upper Body And Separator Plate
      G02383257Courtesy of NISSAN MOTOR CO., U.S.A.
    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
      G02383258Courtesy of NISSAN MOTOR CO., U.S.A.
    6. Remove the retainer plates.
      Fig 36: Identifying Retainer Plates
      G02383259Courtesy of NISSAN MOTOR CO., U.S.A.
    7. Remove each control valve, spring and plug.
      Fig 37: Identifying Control Valve, Spring And Plug
      G02383260Courtesy 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
    G02383261Courtesy of NISSAN MOTOR CO., U.S.A.
  38. Remove the sub oil pump cover bolts.
    Fig 39: Identifying Sub Oil Pump Cover Bolts
    G02383262Courtesy 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: Threading Two Bolts Into Holes Of The Sub Oil Pump Cover
    G02383263Courtesy of NISSAN MOTOR CO., U.S.A.
  40. Remove the outer gear and inner gear from the sub oil pump housing.
    Fig 41: Removing Outer Gear And Inner Gear From Sub Oil Pump Housing
    G02383264Courtesy of NISSAN MOTOR CO., U.S.A.
  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 Bolts
    G02383265Courtesy of NISSAN MOTOR CO., U.S.A.
  42. Remove the O-rings from the oil filter.
    Fig 43: Removing O-Rings From Oil Filter
    G02383266Courtesy 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: Removing O-Ring From Oil Filter Stud
    G02383267Courtesy of NISSAN MOTOR CO., U.S.A.
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