2007 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Automatic Transmission Unit: Disassembly

  1. REMOVE TRANSAXLE CASE COVER UPPER 
    1. Remove the 2 bolts and transaxle case cover upper.
  2. REMOVE TRANSMISSION CONTROL SHAFT LEVER RH 
    1. Remove the nut, spring washer and the transmission control shaft lever RH.
    Fig 1: Locating Transmission Control Shaft Lever Nut (RH)
    G05295471Courtesy 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: Identifying Park/Neutral Position Switch Bolt
    G05295472Courtesy 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 oil cooler tube unions.
    Fig 3: Removing Oil Cooler Tube Unions
    G05295473Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE SPEED SENSOR 
    1. Remove the 2 bolts and the 2 speed sensors.
    2. Remove the O-rings from each sensor.
    Fig 4: Locating Speed Sensors Bolts
    G05294876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE AUTOMATIC TRANSMISSION BREATHER TUBE 
    1. Remove the 2 bolts.
    2. Remove the breather tube.
    Fig 5: Locating Automatic Transmission Breather Tube Bolts
    G05295475Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE AUTOMATIC TRANSMISSION HOUSING 
    1. Remove the 10 bolts.
    2. Remove the transmission housing.
    Fig 6: Locating Automatic Transmission Housing Bolts
    G05295476Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE AUTOMATIC TRANSMISSION FLANGE YOKE ASSEMBLY 
    1. Using a hammer and chisel, loosen the staked part of the nut.
    2. Remove the nut and flange yoke.
      Fig 7: Loosening Staked Part Of Nut
      G05295477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the oil seal from the flange yoke.
    Fig 8: Identifying Oil Seal
    G05295478Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. REMOVE EXTENSION (ATM) HOUSING SUB-ASSEMBLY 
    1. Remove the 6 bolts.
      Fig 9: Locating Extension (ATM) Housing Bolts
      G05295479Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Use a screwdriver to remove the extension housing sub-assembly.
      Fig 10: Removing Extension Housing Sub-Assembly
      G05295480Courtesy 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 11: Removing Snap Ring
    G05295481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. REMOVE RR COVER SLEEVE 
    1. Remove the 2 washers and RR cover sleeve.
  11. REMOVE TRANSMISSION CASE ADAPTOR RADIAL BALL BEARING 
    1. Remove the transmission case adaptor radial ball bearing from the extension housing sub-assembly.
    Fig 12: Identifying Washers And RR Cover Sleeve
    G05295482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. REMOVE AUTOMATIC TRANSMISSION EXTENSION HOUSING OIL SEAL 
    1. Using a screwdriver, remove the oil seal.
    Fig 13: Removing Automatic Transmission Extension Housing Oil Seal
    G05295483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. FIX AUTOMATIC TRANSMISSION CASE SUB-ASSEMBLY 
    1. Install the transmission case on the overhaul attachment.
    Fig 14: Fixing Automatic Transmission Case On Overhaul Attachment
    G05294879Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 over flow plug and the gasket.
    2. Remove the drain plug and the gasket.
    3. Remove the 20 bolts, oil pan and gasket.
    4. Examine 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 what type of wear you will find in the transaxle.

        Steel (magnetic): bearing, gear and plate wear Brass (non-magnetic): bearing wear

    Fig 15: Collecting Steel Chips With Magnet
    G04975943Courtesy 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 assembly from the valve body.
    3. Remove the O-ring from the valve body oil strainer assembly.
    Fig 16: Locating Oil Strainer Bolts
    G05295486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. REMOVE TRANSMISSION WIRE 
    1. Remove the 3 bolts and disconnect the 3 clamps.
    2. Disconnect the 9 connectors from the shift solenoid valves.
      Fig 17: Locating Shift Solenoid Valves Connectors
      G05294883Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the bolt from the transmission case.
    4. Pull the transmission wire out of the transmission case.
    5. Remove the O-ring from the transmission wire.
    Fig 18: Locating Transmission Wire Bolt
    G05294884Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  17. REMOVE TRANSMISSION VALVE BODY ASSEMBLY 
    1. Remove the bolt, the detent spring cover and detent spring.
      Fig 19: Locating Detent Spring Cover Bolt
      G05294885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 20 bolts.
    3. Remove the valve body assembly.
      Fig 20: Locating Transmission Valve Body Assembly Bolts
      G05294886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  18. REMOVE TRANSAXLE CASE GASKET 
    1. Remove the 3 transaxle case gaskets.
    Fig 21: Identifying Transaxle Case Gasket
    G05294887Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  19. REMOVE BRAKE DRUM GASKET 
    1. Remove the 3 brake drum gaskets.
    Fig 22: Identifying Brake Drum Gasket
    G05294888Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  20. REMOVE CHECK BALL BODY 
    1. Remove the check ball body and the spring.
    Fig 23: Identifying Check Ball Body And Spring
    G05294889Courtesy 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 the spring.
    2. Remove the 2 O-rings from the piston.
      NOTE: Take care as the C-3 and B-3 accumulator piston may jump out.
    Fig 24: Removing C-2 Accumulator Piston
    G05294890Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  22. REMOVE B-3 ACCUMULATOR PISTON 
    1. Applying compressed air to the oil hole, remove the B-3 accumulator piston and the spring.
    2. Remove the 2 O-rings from the piston.
      NOTE: Take care as the C-3 accumulator piston may jump out.
  23. REMOVE C-3 ACCUMULATOR PISTON 
    1. While blowing compressed air into the oil hole, remove the C-3 accumulator piston and the 2 springs.
    2. Remove the 2 O-rings from the piston.
    Fig 25: Removing C-3 Accumulator Piston
    G05294891Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  24. REMOVE B-1 ACCUMULATOR VALVE 
    1. Remove the B-1 accumulator valve and the 2 springs.
    Fig 26: Identifying B-1 Accumulator Valve And Springs
    G05294892Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  25. REMOVE PARKING LOCK PAWL BRACKET 
    1. Remove the 3 bolts and the parking lock pawl bracket.
    Fig 27: Locating Parking Lock Pawl Bracket Bolts
    G05294893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  26. REMOVE PARKING LOCK ROD SUB-ASSEMBLY 
    1. Disconnect the parking lock rod from the manual valve lever.
    Fig 28: Identifying Parking Lock Rod
    G05294894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  27. REMOVE PARKING LOCK PAWL SHAFT 
    1. Pull out the parking lock pawl shaft from the front side, then remove the lock pawl and the spring.
    2. Remove the E-ring from the shaft.
    Fig 29: Identifying Parking Lock Pawl Shaft
    G05294895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  28. REMOVE MANUAL VALVE LEVER SUB-ASSEMBLY 
    1. Using a hammer and a screwdriver, cut off the spacer and remove it from the shaft.
      Fig 30: Removing Spacer
      G05294896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a pin punch and a hammer, drive out the spring pin.

      HINT:

      Slowly drive out the spring pin so that it does not fall into the transmission case.

    3. Pull the manual valve lever shaft out through the case, and remove the manual valve lever.
    Fig 31: Removing Spring Pin
    G05295501Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  29. REMOVE MANUAL VALVE LEVER SHAFT OIL SEAL 
    1. Using a screwdriver, remove the 2 oil seals.
    Fig 32: Removing Manual Valve Lever Shaft Oil Seal
    G05294898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  30. REMOVE OIL PUMP ASSEMBLY 
    1. Remove the 10 bolts from the transmission case.
      Fig 33: Locating Transmission Case Bolts
      G05294899Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a screwdriver with its tip wrapped with tape, pull out the oil pump.
      NOTE: Do not damage the oil pump.
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  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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