FixVault
Home › Lexus › 2004 › SC 430 › Repair and Diagnosis › Steering › Power Steering › Power Steering System › Vane Pump ASSY › Overhaul

Vane Pump ASSY: Overhaul

HINT:

COMPONENTS: See COMPONENTS 

NOTE:
  • When using a vise, do not overtighten. 
  • When installing, coat the parts indicated by the arrows with power steering fluid (See  COMPONENTS  ). 
  1. DRAIN POWER STEERING FLUID 
  2. REMOVE ENGINE UNDER COVER 
    1. Remove the 16 screws and engine under cover.
  3. REMOVE ENGINE UNDER COVER REAR RH 
    1. Remove the 2 bolts and engine under cover rear RH.
  4. REMOVE AIR CLEANER INLET NO.1 
    1. Remove the bolt and air cleaner inlet No. 1.
  5. REMOVE AIR CLEANER ASSY 
    1. Disconnect the MAF meter connector.
    2. Remove the clamp.
    3. Remove the 3 bolts and air cleaner assembly.
  6. REMOVE FAN AND GENERATOR V BELT 
    1. Loosen the fan and generator V belt tension by turning the fan and generator V belt tensioner counterclockwise, and remove the fan and generator V belt belt.
      Fig 1: Removing Fan & Generator V Belt
      G00938476Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE VANE PUMP ASSY 
    1. Remove the return hose, 2 vacuum hoses and 3 clips.
    2. Remove the pressure feed hose union bolt, pressure feed tube and gasket.
    3. Remove the 2 bolts, nut and vane pump assembly.
  8. MEASURE PS VANE PUMP ROTATION TORQUE 
    1. Check that the pump rotates smoothly without abnormal noise.
    2. Using a torque wrench, check the pump rotating torque.

      Rotating torque: 

      0.25 N.m (2.5 kgf.cm, 2.2 in.lbf) or less 

      Fig 2: Measuring PS Vane Pump Rotation Torque
      G00938477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. REMOVE VANE PUMP PULLEY 
    1. Using SST to stop the pulley rotating, remove the pulley set nut.

      SST 09960-10010 (09962-01000, 09963-01000)

      Fig 3: Stopping Vane Pump Pulley From Rotating
      G00938478Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. REMOVE AIR CONTROL VALVE ASSY 
    1. Remove the air control valve assy.
    2. If necessary, replace union seat.
      1. Using a screw extractor, remove the union seat.
        Fig 4: Removing Union Seat
        G00938479Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Using an extension bar and a hammer, tap in a new union seat.
        NOTE: Before installing the union seat, remove dust sticking +/- the vane pump housing sub-assy front. 
        Fig 5: Tapping In Union Seat
        G00938480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. REMOVE POWER STEERING SUCTION PORT UNION 
    1. Remove the 2 bolts and power steering suction port union.
    2. Remove the O-ring from the power steering suction port union.
  12. REMOVE POWER STEERING SOLENOID VALVE ASSY 
    1. Using SST, remove the power steering solenoid valve assy.

      SST 09922-10010

      Fig 6: Removing Power Steering Solenoid Valve Assy
      G00938481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Use SST 09922-10010 in the direction shown in  Fig 6  . 
    2. Using snap ring pliers, remove the snap ring from the vane pump housing sub-assy front.
    3. Temporarily install a bolt to the flow control spring seat and pull it out together with the flow control spring seat.
      Fig 7: Installing Bolt To Flow Control Spring Seat & Pulling It Out Together With Flow Control Spring Seat
      G00938482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      Use a bolt with diameter 6 mm (0.24 in.) and pitch 1.0 mm (0.039 in.).

    4. Remove the O-ring from the flow control spring seat.
  13. REMOVE VANE PUMP SHAFT 
    1. Using snap ring pliers, remove the snap ring from the vane pump housing sub-assy front.
    2. Temporarily install a appropriate plate washer and the pulley set nut to the vane pump shaft.
    3. Using SST, pull out the vane pump shaft.

      SST 09910-00015 (09911-00011, 09912-00010)

      4. Fig 8: Removing Vane Pump Shaft
      G00938483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Using snap ring pliers, remove the snap ring from the vane pump shaft.
  14. REMOVE VANE PUMP BRACKET REAR 
    1. Remove the 4 bolts and vane pump bracket rear.
    2. Remove the O-ring from the vane pump bracket rear.
    3. Remove wave washer.
    4. Using an extension bar and a press, press out the vane pump side plate front, vane pump cam ring, vane pump rotor, vane pump plates and vane pump side plate rear as an assembly.
      5. Fig 9: Pressing Out Vane Pump Side Plate Front, Vane Pump Cam Ring, Vane Pump Rotor, Vane Pump Plates & Vane Pump Side Plate Rear As An Assembly
      G00938484Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Using pliers, remove the long cam ring straight pin from the vane pump housing sub-assy front.
    6. Remove the O-ring from the vane pump side plate rear.
      NOTE: Take care not to drop the vane plate. 
    7. Remove the vane pump rotor and the 10 vane pump plates from the vane pump cam ring.
    8. Remove the 10 vane pump plates from the vane pump rotor.
    9. Remove the short cam ring straight pin from the vane pump side plate front.
    10. Remove the 2 O-rings from the vane pump side plate front.
  15. REMOVE VANE PUMP HOUSING OIL SEAL 
    1. Using SST, tap out the oil seal.

      SST 09631-10030

      NOTE: Be careful not to damage the vane pump housing sub-assy front. 
      Fig 10: Removing Vane Pump Housing Oil Seal
      G00938485Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. INSPECT OIL CLEARANCE 
    1. Using a micrometer and caliper gauge, measure the oil clearance.

      Standard clearance: 

      0.03 - 0.045 mm (0.0012 - 0.0018 in.) 

      Maximum clearance: 0.07 mm (0.028 in.) 

      If it is more than the maximum, replace the vane pump housing sub-assy front and vane pump shaft.

      Fig 11: Measuring Oil Clearance
      G00938486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  17. INSPECT VANE PUMP ROTOR AND VANE PUMP PLATES 
    1. Using a micrometer, measure the height, thickness and length of the 10 vane pump plates.

      Minimum height: 8.1 mm (0.318 in.) 

      Minimum thickness: 1.797 mm (0.0707 in.) 

      Minimum length: 14.988 mm (0.5901 in.) 

      Fig 12: Measuring Height, Thickness & Length Of Vane Pump Plates
      G00938487Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a feeler gauge, measure the clearance between the vane pump rotor groove and vane pump plate.

      Maximum clearance: 0.028 mm (0.0011 in.) 

      Fig 13: Measuring Clearance Between Vane Pump Rotor Groove & Vane Pump Plate
      G00938488Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  18. INSPECT FLOW CONTROL VALVE 
    1. Coat the flow control valve with power steering fluid and check that it falls smoothly into the valve hole by its own weight.
      Fig 14: Coating Flow Control Valve With Power Steering Fluid & Checking That It Falls Smoothly Into Valve Hole By Its Own Weight
      G00938489Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the flow control valve for leakage. Close one of the holes and apply 392 - 490 kPa (4 - 5 kgf/cm2 , 57 - 71 psi) of compressed air into the opposite side hole, and confirm that air does not come out from the and holes.
      Fig 15: Checking Flow Control Valve For Leakage
      G00938490Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  19. INSPECT FLOW CONTROL VALVE COMPRESSION SPRING 
    1. Using calipers, measure the free length of the spring.

      Minimum free length: 36.9 mm (1.45 in.) 

      If it is not within the specification, replace vane pump assy.

      Fig 16: Measuring Free Length Of Spring
      G00938491Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  20. INSTALL VANE PUMP HOUSING OIL SEAL 
    1. Coat a new oil seal lip with power steering fluid.
    2. Using SST and a press, press in the oil seal.

      SST 09950-60010 (09951-00180, 09951-00300, 09952-06010), 09950-70010 (09951-07100)

      Fig 17: Installing Vane Pump Housing Oil Seal
      G00938492Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Make sure that the oil seal is installed facing in the correct direction. 
  21. INSTALL VANE PUMP SHAFT 
    1. Using snap ring pliers, install a new snap ring to the vane pump shaft.
    2. Coat the vane pump shaft with power steering fluid.
    3. Using SST, press in the vane pump shaft with the bearing.

      SST 09238-47012

      4. Fig 18: Installing Vane Pump Shaft
      G00938493Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Using snap ring pliers, install a new snap ring to the vane pump housing sub-assy front.
  22. INSTALL VANE PUMP BRACKET REAR 
    1. Coat a new long cam ring straight pin with power steering fluid and install it to the vane pump housing sub-assy front.
      NOTE: Be careful not to damage the cam ring straight pin. 
    2. Coat 2 new O-rings with power steering fluid and install them to the vane pump side plate front.
    3. Coat the vane pump side plate front with power steering fluid.
    4. Using SST, press in the vane pump side plate front.

      SST 09238-47012

      Fig 19: Pressing In Vane Pump Side Plate Front
      G00938494Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Make sure that the vane pump side front plate is installed facing in the correct direction. 
      • Be careful not to damage the O-ring. 

      HINT:

      Align the wide hole of the vane pump side plate front and longer straight pin.

    5. Coat a new short cam ring straight pin with power steering fluid and install it to the vane pump side plate front.
      NOTE: Be careful not to damage the cam ring straight pin. 
    6. Coat the vane pump cam ring with power steering fluid.
    7. Align the wide hole of the vane pump cam ring and long cam ring straight pin, and install the vane pump cam ring with the inscribed mark facing outward.
      8. Fig 20: Aligning Wide Hole Of Vane Pump Cam Ring & Long Cam Ring Straight Pin
      G00938495Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Coat the vane pump rotor with power steering fluid.
    9. Install the vane pump rotor with the inscribed mark facing outward.
    10. Coat the 10 vane pump plates with power steering fluid.
    11. Install the 10 vane pump plates with the round end facing outward.
      Fig 21: Installing Vane Pump Plates With Round End Facing Outward
      G00938496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. Coat a new O-ring with power steering fluid and install it to the vane pump side plate rear.
    13. Coat the vane pump side plate rear with power steering fluid.
    14. Using a press, press in the vane pump side plate rear.
      NOTE: Be careful not to damage the O-ring. 

      HINT:

      Align the wide hole of the vane pump side plate rear and long cam ring straight pin.

      Fig 22: Aligning Wide Hole Of Vane Pump Side Plate Rear & Long Cam Ring Straight Pin
      G00938497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    15. Install the wave washer so that is protrusions fit into the slots in the vane pump side plate rear.
      16. Fig 23: Installing Wave Washer So That Protrusions Fit Into Slots In Vane Pump Side Plate Rear
      G00938498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    16. Coat a new O-ring with power steering fluid and install it to the vane pump bracket rear.
    17. Install the vane pump bracket rear to the front housing with the 4 bolts.

      Torque: 39 N.m (400 kgf.cm, 29 ft.lbf) 

  23. INSTALL POWER STEERING SOLENOID VALVE ASSY 
    1. Coat a new O-ring with power steering fluid and install it to the flow control spring seat.
    2. Install the flow control spring seat with the bolt hole facing outward.
    3. Using snap ring pliers, install a new snap ring.
    4. Coat the flow control valve compression spring with power steering fluid and install it to the vane pump housing sub-assy front.
    5. Install the flow control valve facing assy the correct direction (See COMPONENTS ).
    6. Coat the power steering solenoid valve assy with power steering fluid.
    7. Using SST, install the power steering solenoid valve assy.

      SST 09922-10010

      Fig 24: Installing Power Steering Solenoid Valve Assy
      G00938499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Torque: 51 N.m (520 kgf.cm, 38 ft.lbf) 

      NOTE: Use SST 09922-10010 in the direction shown in  Fig 24  . 

      HINT:

      Use a torque wrench with a fulcrum length of 345 mm (13.58 in.).

  24. INSTALL POWER STEERING SUCTION PORT UNION 
    1. Coat a new O-ring with power steering fluid and install it to the suction port union.
    2. Install the power steering suction port union to the vane pump assembly with the 2 bolts.

      Torque: 13 N.m (130 kgf.cm, 9 ft.lbf) 

  25. INSTALL AIR CONTROL VALVE ASSY 

    Torque: 29 N.m (300 kgf.cm, 22 ft.lbf) 

  26. INSTALL VANE PUMP PULLEY 
    1. Using SST to stop the vane pump pulley rotating, torque the pulley set nut.

      SST 09960-10010 (09962-01000, 09963-01000)

      Torque: 43 N.m (440 kgf.cm, 32 ft.lbf) 

      Fig 25: Installing Vane Pump Pulley
      G00938500Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  27. MEASURE PS VANE PUMP ROTATION TORQUE 
    1. Check that the pump rotates smoothly without abnormal noise.
    2. Using a torque wrench, check the pump rotating torque.
      Fig 26: Measuring PS Vane Pump Rotation Torque
      G00938501Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Rotating torque: 

      0.25 N.m (2.5 kgf.cm, 2.2 in.lbf) or less 

  28. INSTALL VANE PUMP ASSY 
    1. Install the power steering vane pump assembly with the nut.

      Torque: 43 N.m (440 kgf.cm, 32 ft.lbf) 

    2. Install the 2 bolts.

      Torque: 39 N.m (400 kgf.cm, 29 ft.lbf) 

    3. Install the pressure feed tube and a new gasket with the pressure feed hose union bolt.

      HINT:

      Make sure the stopper of the pressure feed tube touches the power steering vane pump body as shown in Fig 27 , then torque the union bolt.

      Fig 27: Identifying Stopper
      G00938502Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Torque: 49 N.m (500 kgf.cm, 36 ft.lbf) 

    4. Connect the return hose with the clip.
    5. Connect the 2 vacuum hoses with the 2 clips.
  29. INSTALL FAN AND GENERATOR V BELT 
    1. Loosen the fan and generator V belt tension by turning the fan and generator V belt tensioner counterclock wise, and install the belt.
      2. Fig 28: Installing Fan & Generator V Belt
      G00938503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  30. INSTALL AIR CLEANER ASSY 
    1. Install the air cleaner assy with the 3 bolts.
    2. Install the clamp.
    3. Connect the MAF meter connector.
  31. INSTALL AIR CLEANER INLET NO.1 
    1. Install the air cleaner inlet No. 1 with the bolt.
  32. INSTALL ENGINE UNDER COVER REAR RH 
    1. Install the engine under cover rear RH with the 2 bolts.
  33. INSTALL ENGINE UNDER COVER 
    1. Install the engine under cover with the 16 bolts.
  34. BLEED POWER STEERING FLUID (See  ON-VEHICLE INSPECTION  ) 
  35. INSPECT FLUID LEAK 
  36. DRIVE TEST 
About FixVault