Center Case

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Remove the rear case assembly. Refer to "DISASSEMBLY ".
Remove the front case assembly. Refer to "DISASSEMBLY ".
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 With Drive Chain
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the front drive shaft front bearing using Tools.
Tool number (A): ST33052000 (-)

(B): ST30031000 (-)

Fig 2: Removing Front Drive Shaft Front Bearing Using Tools
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the front drive shaft rear bearing using Tools.
Tool number (A): ST33052000 (-)

(B): ST30031000 (-)

Fig 3: Removing Front Drive Shaft Rear Bearing Using Tools
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the neutral-4LO and ATP switches.

Fig 4: Identifying Neutral-4LO And ATP Switches
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the bolts (<==) and main oil pump cover.

Fig 5: Locating Main Oil Pump Cover Mounting Bolts
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the outer gear, inner gear and main oil pump housing from the center case.

Fig 6: Identifying Inner And Outer Gear, Main Oil Pump Housing
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the seal ring from the main oil pump cover.
CAUTION: Do not reuse seal ring

Fig 7: Identifying Main Oil Pump Cover Seal Ring
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the stem bleeder from the bleed hole.

Fig 8: Removing Stem Bleeder From Bleed Hole
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the snap ring and washer holder from the mainshaft.
CAUTION: Do not reuse seal ring

Fig 9: Removing Snap Ring And Washer Holder From Mainshaft
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the C-rings from the mainshaft using suitable tool.

Fig 10: Removing C-Rings From Mainshaft Using Suitable Tool
Courtesy of NISSAN NORTH AMERICA, INC.
Set the center case on the press stand. Remove the mainshaft from the center case.

Fig 11: Removing Mainshaft From Center Case Using Press
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the snap ring from the mainshaft using suitable tool.

Fig 12: Removing Snap Ring From Mainshaft Using Suitable Tool
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the thrust needle bearing from the press flange.

Fig 13: Removing Thrust Needle Bearing From Press Flange
Courtesy of NISSAN NORTH AMERICA, INC.
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 Press Flange Using Tool
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the snap ring from the mainshaft using suitable tool.
CAUTION: Do not reuse snap ring

Fig 15: Removing/Installing Mainshaft Snap Ring Using Suitable Tool
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the press flange from the mainshaft.

Fig 16: Removing Press Flange From Mainshaft
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the return spring assembly from the clutch hub.

Fig 17: Removing Return Spring Assembly From Clutch Hub
Courtesy of NISSAN NORTH AMERICA, INC.
Remove each plate from the clutch drum.

Fig 18: Removing Clutch Drum Plate
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the snap ring from the mainshaft.

Fig 19: Identifying Mainshaft And Snap Ring
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the mainshaft from the clutch drum and clutch hub using suitable tool.
Remove the needle bearing and spacer from the mainshaft.

Fig 20: Removing Mainshaft From Clutch Drum And Hub Using Tool
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the snap ring from the clutch hub using suitable tool.
CAUTION: Do not reuse snap ring.

Fig 21: Removing Snap Ring From Clutch Hub Using Suitable Tool
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the oil pressure check plug from the oil pressure check port.
CAUTION: Do not reuse oil pressure check plug.

Fig 22: Identifying Oil Pressure Check Plug And Port
Courtesy of NISSAN NORTH AMERICA, INC.
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
Courtesy of NISSAN NORTH AMERICA, INC.
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 From Clutch Piston Using Tool
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the two D-rings from the clutch piston.
CAUTION: Do not reuse D-rings.

Fig 25: Identifying Clutch Piston And D-Rings
Courtesy of NISSAN NORTH AMERICA, INC.
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
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the two bolts (<==) and oil strainer.

Fig 27: Locating Oil Strainer Mounting Bolts
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the two O-rings from the oil strainer.
CAUTION: Do not reuse O-rings.

Fig 28: Identifying Oil Strainer O-Rings
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the snap ring. Then push the transfer terminal cord assembly into the center case to remove the control valve assembly.

Fig 29: Identifying Control Valve Assembly Snap Ring
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the control valve assembly bolts (<==).
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
Courtesy of NISSAN NORTH AMERICA, INC.
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: Locating Center Case Lip Seals
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the transfer motor bolts (<==) and motor from the center case. Then remove the O-ring from the transfer motor.
CAUTION: Do not reuse O-ring.

Fig 32: Locating Transfer Motor Bolts
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the sub oil pump cover bolts (<==).

Fig 33: Locating Sub Oil Pump Cover Bolts
Courtesy of NISSAN NORTH AMERICA, INC.
Thread two bolts (M4 x 0.8) into the holes of sub oil pump cover as shown below, and pull out to remove the sub oil pump assembly.

Fig 34: Threading Bolts Into Holes Of Sub Oil Pump Cover
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the outer gear and inner gear from the sub oil pump housing.

Fig 35: Identifying Sub Oil Pump Cover, Inner And Outer Gear And Housing
Courtesy of NISSAN NORTH AMERICA, INC.
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 36: Locating Oil Filter Mounting Bolts
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the O-rings (1) from the oil filter (2).
CAUTION: Do not reuse O-rings.

Fig 37: Identifying Oil Filter And O-Rings
Courtesy of NISSAN NORTH AMERICA, INC.
Remove the oil filter stud from the oil filter.
Remove the O-ring from the oil filter stud.
CAUTION: Do not reuse O-ring.

Fig 38: Identifying Oil Filter And Stud, O-Ring
Courtesy of NISSAN NORTH AMERICA, INC.
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 below (<==).
  
  Fig 39: Locating Transfer Assembly Mounting Bolts
  Courtesy of NISSAN NORTH AMERICA, INC.
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.
  CAUTION: Do not reuse O-rings.
  
  Fig 40: Identifying Control Valve Assembly Components
  Courtesy of NISSAN NORTH AMERICA, INC.
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 reverse balls or relief balls. Detach lower body carefully.
  - Do not reuse separator plate.
  Fig 41: Identifying Upper And Lower Body, Separator Plate
  Courtesy of NISSAN NORTH AMERICA, INC.
5. Confirm location of the reverse balls, relief balls, relief springs, accumulator pistons and valve springs before disassembly as shown below, then remove them.
  
  Fig 42: Identifying Accumulator Piston, Relief Ball And Related Components
  Courtesy of NISSAN NORTH AMERICA, INC.
6. Remove each retainer plate (1), plug (2), control valve (3) and spring (4) from the upper body (5).
  
  Fig 43: Identifying Retainer Plate, Plug, Control Valve And Spring
  Courtesy of NISSAN NORTH AMERICA, INC.