2008 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Automatic Transmission Unit: Disassembly

  1. REMOVE TRANSMISSION CASE COVER UPPER 
    1. Remove the 2 bolts and transmission case cover.
  2. REMOVE TRANSMISSION CONTROL SHAFT LEVER RH 
    1. Remove the nut and transmission control shaft lever.
      Fig 1: Locating Transmission Control Shaft Lever Nut
      G05289842Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Using a screwdriver, unstake the lock washer.
    2. Remove the nut and lock washer.
    3. Remove the bolt and park/neutral position switch.
      Fig 2: Locating Bolt And Park/Neutral Position Switch
      G05289843Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE OIL COOLER TUBE UNION 
    1. Remove the 2 oil cooler tube unions.
    2. Remove the O-rings from the unions.
      Fig 3: Removing Oil Cooler Tube Unions
      G05289844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE TRANSMISSION REVOLUTION SENSOR 
    1. Remove the 2 bolts and 2 sensors.
    2. Remove the O-ring from each sensor.
      Fig 4: Locating Transmission Revolution Sensors And Bolts
      G05289845Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE AUTOMATIC TRANSMISSION BREATHER TUBE 
    1. Remove the 2 bolts and breather tube.
      Fig 5: Locating Bolts And Breather Tube
      G05839321Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE AUTOMATIC TRANSMISSION HOUSING 
    1. Remove the 10 bolts.
    2. Remove the transmission housing.
      Fig 6: Locating Transmission Housing Bolts
      G05289847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE AUTOMATIC TRANSMISSION FLANGE YOKE ASSEMBLY 
    1. Using SST and a hammer, loosen the staked part of the nut.

      SST 09930-00010 

      Fig 7: Loosening Staked Part Of Nut
      G05289848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using SST and a 30 mm socket wrench, remove the nut.

      SST 09330-00021, 09950-30012 (09955-03040) 

    3. Remove SST.
    4. Tap the output flange with a plastic-faced hammer to remove it.
      Fig 8: Removing Nut
      G05289849Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the oil seal from the flange yoke.
      Fig 9: Identifying Oil Seal
      G05289850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. REMOVE EXTENSION HOUSING SUB-ASSEMBLY 
    1. Remove the 6 bolts.
      Fig 10: Locating Extension Housing Bolts
      G05289851Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a screwdriver, pry out the extension housing.
      Fig 11: Prying Out Extension Housing
      G05289852Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using a snap ring expander, remove the snap ring.
    4. Remove the thrust needle roller bearing and the 2 bearing races.
      Fig 12: Removing Snap Ring
      G04963498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. REMOVE REAR COVER SLEEVE 
    1. Remove the 2 washers and cover sleeve.
  11. REMOVE TRANSMISSION CASE ADAPTOR RADIAL BALL BEARING 
    1. Remove the transmission case adaptor radial ball bearing from the extension housing.
      Fig 13: Identifying Washers And Cover Sleeve
      G05289854Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. REMOVE AUTOMATIC TRANSMISSION EXTENSION HOUSING OIL SEAL 
    1. Using a screwdriver, pry out the oil seal.
      Fig 14: Prying Out Oil Seal
      G05289855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. FIX AUTOMATIC TRANSMISSION CASE SUB-ASSEMBLY 
    1. Install the transmission case on the overhaul attachment.
  14. REMOVE AUTOMATIC TRANSMISSION OIL PAN SUB-ASSEMBLY 
    NOTE: Do not turn the transmission over as this will contaminate the valve body with foreign matter located at the bottom of the pan.
    1. Remove the overflow plug and gasket.
      Fig 15: Installing Transmission Case On Overhaul Attachment
      G05289856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the drain plug and gasket.
    3. Remove the 20 bolts, oil pan and gasket.
    4. Examine the particles in the pan.
      1. Remove the magnets from the oil pan. Use the removed magnets to collect any steel chips. Look carefully at the chips and particles in the pan and on the magnet to anticipate the type of wear which might be found in the transmission. Steel (magnetic): bearing, gear and plate wear Brass (non-magnetic): bush wear
        Fig 16: Removing Magnets
        G04831117Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. REMOVE VALVE BODY OIL STRAINER ASSEMBLY 
    1. Turn over the transmission.
    2. Remove the 4 bolts and valve body oil strainer from the valve body.
    3. Remove the O-ring from the valve body oil strainer.
      Fig 17: Locating Valve Body Oil Strainer Bolts
      G05289858Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. REMOVE TRANSMISSION WIRE 
    1. Remove the bolt, lock plate and ATF temperature sensor.
      Fig 18: Locating ATF Temperature Sensor
      G05289664Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 2 bolts and disconnect the 2 clamps.
      Fig 19: Locating Transmission Wire Clamp And Bolts
      G05289665Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the 9 connectors from the solenoid valves.
    4. Disconnect the transmission wire connector.
      Fig 20: Locating Solenoid Valves Connectors
      G05289666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the bolt and pull out the transmission wire.
      Fig 21: Locating Case Bolt
      G04963504Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Remove the O-ring from the transmission wire.
      Fig 22: Identifying Transmission Wire O Ring
      G05289668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  17. REMOVE TRANSMISSION VALVE BODY ASSEMBLY 
    1. Remove the bolt, detent spring cover and detent spring.
      Fig 23: Identifying Detent Spring Cover And Detent Spring With Bolt
      G05289864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 20 bolts.
    3. Remove the valve body.
      Fig 24: Locating Valve Body Bolts
      G05288236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  18. REMOVE TRANSMISSION CASE GASKET 
    1. Remove the 3 transmission case gaskets.
      Fig 25: Identifying Transaxle Case Gaskets
      G04963506Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  19. REMOVE BRAKE DRUM GASKET 
    1. Remove the 3 brake drum gaskets.
      Fig 26: Identifying Brake Drum Gaskets
      G04963507Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  20. REMOVE CHECK BALL BODY 
    1. Remove the check ball body and spring.
      Fig 27: Identifying Check Ball Body And Spring
      G05289868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  21. REMOVE C-2 ACCUMULATOR PISTON 
    1. While blowing compressed air into the oil hole, remove the C-2 accumulator piston and spring.
    2. Remove the 2 O-rings from the piston.
      NOTE: The C-3 and B-3 accumulator pistons may jump out.
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