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Home >> Infiniti >> 2007 >> QX56 AWD >> Repair and Diagnosis >> Transmission >> Transfer Case >> Transfer Assembly >> Disassembly and Assembly >> Assembly >> Center Case

Center Case

  1. Apply ATF to the new O-ring, and install it on the oil filter stud.
    CAUTION: Do not reuse O-ring.
  2. Install the oil filter stud to the oil filter.
    Fig 1: Applying ATF To O-Ring
    G04901612
  3. Apply ATF to the two new O-rings (1), and install them on the oil filter (2).
    CAUTION: Do not reuse O-rings.
    Fig 2: Applying ATF To O-Rings
    G04901611
  4. Install the oil filter to the center case. Tighten the bolts to the specified torque. Refer to "COMPONENTS ".
    CAUTION:
    • Do not damage oil filter.
    • Attach oil filter and tighten bolts evenly.
      Fig 3: Locating Oil Filter Center Case Bolts
      G04901615
  5. Install the outer gear and inner gear into the sub oil pump housing, and measure the side clearance. Refer to "SUB-OIL PUMP ".
    Fig 4: Identifying Outer Gear And Inner Gear Into Sub Oil Pump Housing
    G04901688
  6. Align the dowel pin hole and bolt hole of the sub oil pump assembly with the center case. Install the sub oil pump cover. Then tighten to the specified torque. Refer to "COMPONENTS ".
    Fig 5: Aligning Dowel Pin Hole And Bolt Hole Of Sub Oil Pump Assembly With Center Case
    G04901710
  7. Apply ATF to the new O-ring and install it to the transfer motor.
    CAUTION: Do not reuse O-ring.
  8. Fit the double-flat end of the transfer motor shaft into the slot of the sub-oil pump assembly. Then tighten to the specified torque. Refer to "COMPONENTS ".
    CAUTION: Be sure to install connector bracket.
    Fig 6: Applying ATF To O-Ring
    G04901609
  9. Assemble 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 assembly.
    1. Clean the upper body, control valves and springs with cleaning agent, and dry with compressed air.
    2. Dip the control valves in ATF, and apply ATF to the valve-mounting area of the upper body.
      Fig 7: Identifying Upper Body, Control Valves And Springs With Cleaning Agent
      G04901684
    3. Install each control valve, spring, and plug to the upper body, and install retainer plates to hold them in place.
      CAUTION:
      • To insert control valves into upper body, place upper body on a level surface in order to prevent flaw or damage.
      • Make sure each control valve is smoothly inserted.
        Fig 8: Identifying Control Valve, Spring And Plug To Upper Body
        G04901683
    4. Install the reverse balls, relief balls and relief springs, accumulator pistons and valve springs to the upper body.
      Fig 9: Identifying Reverse Balls, Relief Balls, Relief Springs, Accumulator Pistons And Valve Springs
      G04901682
    5. Install the lower body and new separator plate to the upper body.
      CAUTION: Do not reuse separator plate.
      Fig 10: Identifying Lower Body And Separator Plate To Upper Body
      G04901715
    6. With the lower body down, tighten the two bolts shown.
    7. Apply ATF to the new O-rings, and install them to each solenoid valve, switch and terminal body.
      CAUTION: Do not reuse O-rings.
    8. Install the following to the control valve assembly:
      • Clutch pressure solenoid valve
      • 2-4WD shift solenoid valve
      • Clutch pressure switch
      • Line pressure switch
      • Transfer fluid temperature sensor
        Fig 11: Identifying Clutch Pressure Solenoid Valve, Clutch Pressure Switch And Line Pressure Switch
        G04901679
  10. Apply ATF to the new lip seals, and install them to the center case.
    CAUTION:
    • Do not reuse lip seals.
    • There are 2 kinds of lip seals (lip seal of large inner diameter: 5 pieces, lip seal of small inner diameter: 2 pieces). Confirm their position for installation.
      Fig 12: Locating Lip Seals
      G04901678
  11. Install the control valve assembly to the center case, and tighten to the specified torque. Refer to "COMPONENTS ".
    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 assembly.
      Fig 13: Locating Control Valve Assembly To Center Case
      G04901677
  12. Install the connector assembly into the center case, and secure with a snap ring.
    Fig 14: Identifying Connector Assembly Snap Ring
    G04901676
  13. Apply ATF to the new O-rings, and install them on the oil strainer.
    CAUTION: Do not reuse O-rings.
  14. Install the oil strainer to the control valve assembly.
    Fig 15: Applying ATF To O-Rings
    G04901675
  15. Tighten the bolts to the specified torque. Refer to "COMPONENTS ".
    Fig 16: Identifying Bolts And Oil Strainer
    G04901674
  16. Apply ATF to the new D-rings, and install them to the clutch piston.
    CAUTION: Do not reuse D-rings.
    Fig 17: Applying ATF To D-Rings
    G04901672
  17. Install the thrust needle bearing race to the clutch piston.
    Fig 18: Installing Thrust Needle Bearing Race To Clutch Piston
    G04901723
  18. Install the clutch piston to the center case as shown.
    CAUTION: Install so the fitting protrusion of clutch piston aligns with the dent of center case.
    Fig 19: Identifying Clutch Piston To Center Case
    G04901724
  19. Remove all the sealant from the oil pressure check port and inside the center case.
    CAUTION: Remove old sealant adhering to mating surfaces. Also remove any moisture, oil, or foreign material adhering to application and mating surfaces.
  20. Thread the new oil pressure check plug in 1 or 2 pitches and apply sealant to the oil pressure check plug threads. Tighten to the specified torque. Refer to "COMPONENTS ".
  21. Install the new snap ring to the clutch hub using suitable tool.
    CAUTION: Do not reuse snap ring.
    Fig 21: Installing Snap Ring To Clutch Hub
    G04901668
  22. Apply petroleum jelly to the needle bearing, and install the needle bearing, spacer, clutch drum and clutch hub to the mainshaft.
    Fig 22: Identifying Needle Bearing, Spacer, Clutch Drum And Clutch Hub To Main-Shaft
    G04901727
  23. Install the new snap ring to the mainshaft.
    CAUTION: Do not reuse snap ring.
    Fig 23: Identifying Snap Ring
    G04901728
  24. Apply ATF to each plate, then install them into the clutch drum as shown.
    Fig 24: Identifying Clutch Drum, Drive Plate And Clutch Hub
    G04901729
  25. Install the return spring assembly into the clutch hub.
    Fig 25: Installing Return Spring Assembly Into Clutch Hub
    G04901664
  26. Install the press flange by aligning the notches to the clutch hub as shown.
    Fig 26: Identifying Press Flange
    G04901731
  27. Press the press flange to install the new snap ring into snap ring groove on mainshaft using Tools.

    Tool number A: ST22452000 (J-34335) 

    B: ST30911000 ( - ) 

    C: KV31103300 ( - ) 

    CAUTION: Do not reuse snap ring.
    Fig 27: Pressing Flange
    G04901661
  28. Install the new snap ring to the mainshaft using suitable tool.
    CAUTION: Do not reuse snap ring.
    Fig 28: Installing Snap Ring
    G04901662
  29. Apply ATF to the thrust needle bearing and install it on the press flange.
    Fig 29: Identifying Thrust Needle Bearing
    G04901660
  30. Install the new snap ring to the main shaft.
    CAUTION: Do not reuse snap ring.
    Fig 30: Identifying Snap Ring
    G04901735
  31. Install the mainshaft rear bearing to the center case using Tool.

    Tool number : ST15310000 (J-25640-B) 

    Fig 31: Identifying Mainshaft Rear Bearing
    G04901736
  32. Press the mainshaft assembly into the center case using Tools.

    Tool number A: ST30911000 ( - ) 

    B: ST33052000 ( - ) 

    Fig 32: Pressing Mainshaft Assembly
    G04901737
  33. Install the C-rings to the mainshaft.
    Fig 33: Identifying C-Rings
    G04901738
  34. Set the washer holder on the mainshaft, and secure it with a new snap ring using suitable tool.
    CAUTION: Do not reuse snap ring.
    Fig 34: Identifying Snap Ring And Washer Holder
    G04901656
  35. Apply petroleum jelly to the stem bleeder and install it to the center case.
    Fig 35: Identifying Petroleum Jelly Applying Area
    G04901655
  36. Apply ATF to the new seal ring and install it to the main oil pump cover.
    CAUTION: Do not reuse seal ring.
    Fig 36: Identifying Seal Ring
    G04901654
  37. Install the inner gear and outer gear in the main oil pump housing. Then measure the side clearance. Refer to "MAIN OIL PUMP ".
    Fig 37: Measuring Side Clearance
    G04901699
  38. Install the main oil pump housing, outer gear and inner gear to the center case.
    Fig 38: Identifying Main Oil Pump Housing, Outer Gear And Inner Gear
    G04901743
  39. Install the main oil pump cover to the center case, and tighten to the specified torque. Refer to "COMPONENTS ".
    Fig 39: Identifying Main Oil Pump Cover Bolts
    G04901652
  40. Remove all the sealant from the switch mating area and inside the center case.
    CAUTION: Remove old sealant adhering to mating surfaces. Also remove any moisture, oil, or foreign material adhering to application and mating surfaces.
  41. Thread the ATP switch and neutral-4LO switch in one to two pitches and apply sealant to the threads of the switches. Tighten to the specified torque. Refer to "COMPONENTS ".
    • Use Genuine Silicone RTV or equivalent.  Refer to "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS ".
      NOTE:
      • Neutral-4LO switch harness connector is gray.
      • ATP switch harness connector is black.
        Fig 40: Identifying Sealant Applying To Threads Of Switches
        G04901745
  42. Install the front drive shaft rear bearing using Tools.

    Tool number A: KV40100621 (J-25273) 

    B: ST30032000 (J-26010-01) 

    Fig 41: Identifying Front Drive Shaft Rear Bearing
    G04901746
  43. Install the front drive shaft to the front bearing using Tools.

    Tool number A: KV40100621 (J-25273) 

    B: ST30032000 (J-26010-01) 

    Fig 42: Installing Front Drive Shaft To Front Bearing
    G04901747
  44. Install the drive chain to the front drive shaft and clutch drum.
    CAUTION: Install drive chain by aligning identification marks to the rear as shown.
    Fig 43: Identifying Identification Marks
    G04901748
  45. Tap the front drive shaft while keeping it upright and press-fit the front drive shaft rear bearing.
    CAUTION: Do not tap drive chain.
  46. Install the front case assembly. Refer to "FRONT CASE ".
  47. Install the rear case assembly. Refer to "REAR CASE ".
    Fig 44: Tapping Front Drive Shaft
    G04901749
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