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Home › Infiniti › 2005 › QX56 AWD › Repair and Diagnosis › Transmission › Transfer Case › Transfer Assembly › Disassembly and Assembly › Assembly › Center Case

Center Case

  1. Apply ATF to the O-ring, and install it on the oil filter stud.
    CAUTION: Do not reuse O-rings.
  2. Install the oil filter stud to the oil filter.
    Fig 1: Installing Oil Filter Stud To Oil Filter
    G02383282Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Apply ATF to the two O-rings, and install them on the oil filter.
    CAUTION: Do not reuse O-rings.
    Fig 2: Installing O-Rings Onto Oil Filter
    G02383283Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Identifying Oil Filter And Bolts
    G02383284Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Installing Outer Gear And Inner Gear Into Sub Oil Pump Housing
    G02383285Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Identifying Sub Oil Pump Cover And Dowel Pin
    G02383286Courtesy of NISSAN MOTOR CO., U.S.A.
  7. Apply ATF to the O-ring and install it to the transfer motor.
    CAUTION: Do not reuse O-rings.
  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: Fitting The Double-Flat End Of Transfer Motor Shaft Into The Slot Of Sub-Oil Pump Assembly
    G02383287Courtesy of NISSAN MOTOR CO., U.S.A.
  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 Components
      G02383288Courtesy of NISSAN MOTOR CO., U.S.A.
    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 Retainer Plates
      G02383289Courtesy of NISSAN MOTOR CO., U.S.A.
    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
      G02383290Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Install the lower body and separator plate to the upper body.
      CAUTION: Do not reuse separator plates.
      Fig 10: Identifying Lower Body, Upper Body And Separator Plate
      G02383291Courtesy of NISSAN MOTOR CO., U.S.A.
    6. With the lower body down, tighten the two bolts shown.
    7. Apply ATF to the 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
      • Clutch pressure switch
      • 2-4WD shift solenoid valve
      • Line pressure switch
      • Transfer fluid temperature sensor
      Fig 11: Identifying Control Valve Assembly Bolts
      G02383292Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Apply ATF to 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: Identifying Large And Small Lip Seals
    G02383293Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Installing Control Valve Assembly To Center Case And Tightening To Specified Torque
    G02383294Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Install the connector assembly into the center case, and secure with a snap ring.
    Fig 14: Installing Connector Assembly Into Center Case And Securing With Snap Ring
    G02383295Courtesy of NISSAN MOTOR CO., U.S.A.
  13. Apply ATF to the 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 And Installing Them On Oil Strainer
    G02383296Courtesy of NISSAN MOTOR CO., U.S.A.
  15. Tighten the bolts to the specified torque. Refer to "COMPONENTS ".
    Fig 16: Identifying Oil Strainer And Bolts
    G02383297Courtesy of NISSAN MOTOR CO., U.S.A.
  16. Apply ATF to the D-rings, and install them to the clutch piston.
    CAUTION: Do not reuse D-rings.
    Fig 17: Applying ATF To D-Rings And Installing Them To Clutch Piston
    G02383298Courtesy of NISSAN MOTOR CO., U.S.A.
  17. Install the thrust needle bearing race to the clutch piston.
    Fig 18: Installing Thrust Needle Bearing Race To Clutch Piston
    G02383299Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Installing Clutch Piston So Fitting Protrusion Aligns With The Dent Of Center Case
    G02383300Courtesy of NISSAN MOTOR CO., U.S.A.
  19. Remove all the sealant from the oil pressure check port and inside the center case.
    CAUTION: Remove old sealant adhering to mounting surfaces. Also remove any moisture, oil, or foreign material adhering to application and mounting surfaces.
  20. Thread the 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 ".
    CAUTION: Do not reuse oil pressure check plug.
    Fig 20: Identifying Center Case And Oil Pressure Check Plug
    G02383301Courtesy of NISSAN MOTOR CO., U.S.A.
  21. Install the snap ring to the clutch hub, using suitable tool.
    CAUTION: Do not reuse snap ring.
    Fig 21: Installing Snap Ring To Clutch Hub Using Suitable Tool
    G02383302Courtesy of NISSAN MOTOR CO., U.S.A.
  22. Apply petroleum jelly to the needle bearing, and install the needle bearing, spacer, clutch drum and clutch hub to the mainshaft.
    Fig 22: Installing Needle Bearing, Spacer, Clutch Drum And Clutch Hub To Mainshaft
    G02383303Courtesy of NISSAN MOTOR CO., U.S.A.
  23. Install the snap ring to the mainshaft.
    CAUTION: Do not reuse snap rings.
    Fig 23: Identifying Snap Ring And Mainshaft
    G02383304Courtesy of NISSAN MOTOR CO., U.S.A.
  24. Apply ATF to each plate, then install them into the clutch drum as shown.
    Fig 24: Applying ATF To Each Plate, And Installing Into Clutch Drum
    G02383305Courtesy of NISSAN MOTOR CO., U.S.A.
  25. Install the return spring assembly into the clutch hub.
    Fig 25: Identifying Return Spring Assembly
    G02383306Courtesy of NISSAN MOTOR CO., U.S.A.
  26. Install the press flange by aligning the notches to the clutch hub as shown.
    Fig 26: Installing Press Flange By Aligning Notches To The Clutch Hub
    G02383307Courtesy of NISSAN MOTOR CO., U.S.A.
  27. Press the press flange to install snap ring into snap ring groove on mainshaft, using Tools.
    1. Tool number A: ST22452000 (J-34335) 
      1. B:ST30911000( - ) 
      2. C:KV31103300( - ) 
    CAUTION: Do not reuse snap ring.
    Fig 27: Pressing The Press Flange To Install Snap Ring Into Snap Ring Groove On Mainshaft, Using Specified Tools
    G02383308Courtesy of NISSAN MOTOR CO., U.S.A.
  28. Install the snap ring to the mainshaft, using suitable tool.
    CAUTION: Do not reuse snap ring.
    Fig 28: Installing Snap Ring To Mainshaft Using Suitable Tool
    G02383309Courtesy of NISSAN MOTOR CO., U.S.A.
  29. Apply ATF to the thrust needle bearing and install it on the press flange.
    Fig 29: Identifying Thrust Needle Bearing And Press Flange
    G02383310Courtesy of NISSAN MOTOR CO., U.S.A.
  30. Install the snap ring to the main shaft.
    CAUTION: Do not reuse snap ring.
    Fig 30: Identifying Snap Ring
    G02383311Courtesy of NISSAN MOTOR CO., U.S.A.
  31. Install the mainshaft rear bearing to the center case, using Tool.
    1. Tool number: ST15310000 (J-25640-B) 
    Fig 31: Installing Mainshaft Rear Bearing To Center Case Using Tool (ST15310000)
    G02383312Courtesy of NISSAN MOTOR CO., U.S.A.
  32. Install the mainshaft assembly, using a press.
    • Press the mainshaft into the center case, using Tools.

      Tool number A:ST30911000( - ) 

      1. B:ST33052000( - ) 
    Fig 32: Pressing Mainshaft Into Center Case Using Specified Tools
    G02383313Courtesy of NISSAN MOTOR CO., U.S.A.
  33. Install the C-rings to the mainshaft.
    Fig 33: Identifying C-Rings And Mainshaft
    G02383314Courtesy of NISSAN MOTOR CO., U.S.A.
  34. Set the washer holder on the mainshaft, and secure it with a snap ring.
    CAUTION: Do not reuse snap ring.
    Fig 34: Setting Washer Holder On Mainshaft, And Securing With Snap Ring
    G02383315Courtesy of NISSAN MOTOR CO., U.S.A.
  35. Apply petroleum jelly to the stem bleeder and install it to the center case.
    Fig 35: Applying Petroleum Jelly To Stem Bleeder
    G02383316Courtesy of NISSAN MOTOR CO., U.S.A.
  36. Apply ATF to the seal ring and install it to the main oil pump cover.
    CAUTION: Do not reuse seal ring.
    Fig 36: Identifying Seal Ring
    G02383317Courtesy of NISSAN MOTOR CO., U.S.A.
  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 Of Main Oil Pump Housing Inner And Outer Gears
    G02383318Courtesy of NISSAN MOTOR CO., U.S.A.
  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
    G02383319Courtesy of NISSAN MOTOR CO., U.S.A.
  39. Install the main oil pump cover to the center case, and tighten to the specified torque. Refer to "COMPONENTS ".
    Fig 39: Identifying Mainshaft And Bolts
    G02383320Courtesy of NISSAN MOTOR CO., U.S.A.
  40. Remove all the sealant from the switch mounting area and inside the center case.
    CAUTION: Remove old sealant adhering to mounting surfaces. Also remove any moisture, oil, or foreign material adhering to application and mounting 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 ".
    NOTE:
    • Neutral-4LO switch harness connector is gray.
    • ATP switch harness connector is black.
    Fig 40: Identifying ATP And Neutral-4LO Switch
    G02383321Courtesy of NISSAN MOTOR CO., U.S.A.
  42. Install the front drive shaft rear bearing, using Tools.
    1. Tool number A:KV40100621 (J-25273) 
      1. B:ST30032000 (J-26010-01) 
    Fig 41: Installing Front Drive Shaft Rear Bearing Using Specified Tools
    G02383322Courtesy of NISSAN MOTOR CO., U.S.A.
  43. Install the front drive shaft to the front bearing, using Tools.
    1. Tool number A:KV40100621 (J-25273) 
      1. B:ST30032000 (J-26010-01) 
    Fig 42: Installing Front Drive Shaft To Front Bearing Using Specified Tools
    G02383323Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Installing Drive Chain By Aligning Identification Marks To The Rear
    G02383324Courtesy of NISSAN MOTOR CO., U.S.A.
  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
    G02383325Courtesy of NISSAN MOTOR CO., U.S.A.
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