Lexus GS, SC 1998-06

Wheel Bearings

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Adjustment



Check the backlash in bearing shaft direction and the axle hub deviation. Maximum for backlash should be 0.0020 in. (0.05mm) and for axle hub deviation 0.020 in. (0.05mm).



Click image to see an enlarged view

Fig. Checking wheel bearings for excessive play


NOTE
The front and rear wheel bearings are non-adjustable. If the wheel bearing is out of specifications, replace the wheel bearing.

Check the backlash in bearing shaft direction and the axle hub deviation. Maximum for backlash should be 0.0020 in. (0.05mm) and for axle hub deviation 0.020 in. (0.05mm).

Click image to see an enlarged view

Fig. Checking wheel bearings for excessive play


NOTE
The front and rear wheel bearings are non-adjustable. If the wheel bearing is out of specifications, replace the wheel bearing.

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Front wheel
     
    Caliper, leaving the brake line connected and suspend it out of the way
     

  4.  


WARNING
Never allow the brake caliper to hang freely from the brake hose.



Rotor
 
Anti-lock Brake System (ABS) speed sensor and harness
 
Tie rod from the arm on the lower ball joint
 
Upper suspension arm from the steering knuckle
 
Steering knuckle from the lower control arm
 
Ball joint from the steering knuckle
 
Front hub grease cap
 

  1. Clamp the hub in a soft jaw vise.
  2.  
  3. Using a hammer and chisel, loosen the staked part of the locknut.
  4.  
  5. Remove or disconnect the following:

    Locknut
     
    ABS speed sensor rotor
     

  6.  


NOTE
Do NOT scratch the serrations of the sensor rotor.



Brake dust cover bolts and shift the cover toward the outside.
 
Hub from the steering knuckle
 
Inner bearing race from the hub shaft
 
Oil seal from the knuckle
 
Bearing snapring from the steering knuckle
 
Bearing from the steering knuckle
 

To install:

  1. Install or connect the following:

    New bearing into the steering knuckle
     

  2.  


NOTE
If the inner race and balls come loose from the bearing outer race, be sure to install them on the same side as before.



Snapring
 
New outside inner race and tap in the new seal. Tap the seal until it is flush with the end surface of the steering knuckle.
 
Brake dust cover to the knuckle and tighten the bolts to 74 inch lbs. (8 Nm)
 
Hub into the steering knuckle
 
ABS speed sensor rotor
 
Axle hub locknut. Tighten the nut to 147 ft. lbs. (199 Nm) and stake it.
 
Grease cap to the steering knuckle by tapping lightly around the circumference of the cap with a hammer
 
Ball joint to the steering knuckle. Tighten the 2 bolts to 83 ft. lbs. (113 Nm).
 
Steering knuckle to the upper and lower suspension arms. Tighten the upper nut to 64 ft. lbs. (87 Nm) and the lower nut to 95 ft. lbs. (127 Nm). Install a new cotter pin on the lower nut. Install the clip on the upper suspension arm nut.
 
Tie rod end to the steering knuckle. Tighten the nut to 64 ft. lbs. (87 Nm) and install a new cotter pin.
 
Rotor, disc brake pads and the brake caliper
 
ABS speed sensor and harness. Tighten the sensor retaining bolt to 69 inch lbs. (8 Nm).
 
Wheel
 

  1. Lower the vehicle and connect the negative battery cable.
  2.  
  3. Check the front wheel alignment.
  4.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. If equipped with air suspension, move the height control switch in the trunk area to theOFF
  4.  
  5. Remove or disconnect the following:

    Front tire and wheel assembly
     
    Brake caliper bracket from the steering knuckle, leaving the brake line connected. Support the caliper with a piece of wire.
     
    Brake rotor
     
    Anti-lock Brake System (ABS) speed sensor from the steering knuckle
     
    Steering knuckle from the lower ball joint by removing the 2 bolts
     
    Steering knuckle from the upper ball joint
     
    Steering knuckle with the axle hub from the vehicle
     
    Grease cap from the hub
     
    Nut and the speed sensor rotor
     
    4 bolts and shift the brake dust cover towards the hub side
     
    Axle hub from the steering knuckle
     
    Outside inner race from the axle
     
    Oil seal from the steering knuckle
     
    Snapring and bearing from the steering knuckle
     

  6.  

To install:

  1. Install or connect the following:

    Bearing in the steering knuckle
     
    Snapring
     
    Inner race (outside)
     
    New oil seal until it is flush with the end surface of the steering knuckle
     
    Brake dust cover to the steering knuckle and tighten the bolts to 74 inch lbs. (8.4 Nm)
     
    Axle hub to the steering knuckle
     
    ABS speed sensor
     
    New nut on the axle shaft. Tighten the nut to 147 ft. lbs. (199 Nm). Stake the nut and install the grease cap.
     
    Steering knuckle to the lower ball joint and tighten the bolts to 83 ft. lbs. (113 Nm)
     
    Steering knuckle to the upper ball joint and tighten the nut to 48 ft. lbs. (65 Nm)
     
    Brake rotor
     
    Brake caliper and tighten the 2 bolts to 87 ft. lbs. (118 Nm)
     
    Speed sensor to the steering knuckle
     
    Front tire and wheel assembly
     

  2.  
  3. If equipped with air suspension, turn the height control switch to theON
  4.  


    Click image to see an enlarged view

    Fig. Axle hub nut is located on the inboard side of the knuckle assembly-LS 430




Click image to see an enlarged view

Fig. Exploded view front hub and bearing assembly-LS 430 (2004)

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Front wheels
     
    Skid control wire
     
    Disc brake caliper assembly
     
    4 bolts and front axle hub assembly
     
    Skid control sensor
     

  4.  

To install:

  1. Install or connect the following:

    Skid control sensor
     
    4 bolts and front axle hub assembly. Tighten to 51 ft. lbs (69 Nm)
     
    2 bolts and front disc brake caliper assembly. Tighten to 58 ft. lbs. (78 Nm)
     
    Skid control sensor wire
     
    Front wheel
     

  2.  
  3. Inspect and adjust front wheel alignment
  4.  
  5. Check ABS sensor signal
  6.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:
    WARNING
    Never allow the brake caliper to hang freely from the brake hose.



    Negative battery cable.
     
    Front wheel
     
    Caliper, leaving the brake line connected and suspend it out of the way.
     



    Rotor
     
    Anti-lock Brake System (ABS) speed sensor and harness
     
    Tie rod from the arm on the lower ball joint
     
    Upper suspension arm from the steering knuckle
     
    Steering knuckle from the lower control arm
     
    Ball joint from the steering knuckle
     
    Front hub grease cap
     

  4.  
  5. Clamp the hub in a soft jaw vise.
  6.  
  7. Using a hammer and chisel, loosen the staked part of the locknut.
  8.  
  9. Remove or disconnect the following:
    NOTE
    Do not scratch the serrations of the sensor rotor.



    Locknut
     
    ABS speed sensor rotor
     



    Brake dust cover bolts and shift the cover toward the outside.
     
    Hub from the steering knuckle
     
    Inner bearing race from the hub shaft
     
    Oil seal from the knuckle
     
    Bearing snapring from the steering knuckle
     
    Bearing from the steering knuckle
     

  10.  

To install:

  1. Install or connect the following:
    NOTE
    If the inner race and balls come loose from the bearing outer race, be sure to install them on the same side as before.



    New bearing into the steering knuckle
     



    Snapring
     
    New outside inner race and tap in the new seal. Tap the seal until it is flush with the end surface of the steering knuckle.
     
    Brake dust cover to the knuckle and tighten the bolts to 74 inch lbs. (8 Nm).
     
    Hub into the steering knuckle
     
    ABS speed sensor rotor.
     
    Axle hub locknut. Tighten the nut to 147 ft. lbs. (199 Nm) and stake it.
     
    Grease cap to the steering knuckle by tapping lightly around the circumference of the cap with a hammer.
     
    Ball joint to the steering knuckle. Tighten the 2 bolts to 83 ft. lbs. (113 Nm).
     
    Steering knuckle to the upper and lower suspension arms. Tighten the upper nut to 64 ft. lbs. (87 Nm) and the lower nut to 95 ft. lbs. (127 Nm). Install a new cotter pin on the lower nut. Install the clip on the upper suspension arm nut.
     
    Tie rod end to the steering knuckle. Tighten the nut to 64 ft. lbs. (87 Nm) and install a new cotter pin.
     
    Rotor, disc brake pads and the brake caliper.
     
    ABS speed sensor and harness. Tighten the sensor retaining bolt to 69 inch lbs. (8 Nm).
     
    Wheel
     

  2.  
  3. Lower the vehicle and connect the negative battery cable.
  4.  
  5. Check the front wheel alignment.
  6.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Front tire and wheel assembly
     
    Brake caliper support bracket, leaving the brake line connected
     
    Rotor by removing the 2 screws.
     
    Anti-lock Brake System (ABS) speed sensor
     
    Cotter pin and nut and disconnect the tie rod from the steering knuckle.
     
    Cotter pin and nut and disconnect the steering knuckle from the upper control arm.
     
    Clip and nut and press the knuckle off the lower control arm.
     
    Steering knuckle from the vehicle
     
    Hub bearing cap from the steering knuckle
     
    Hub nut
     
    ABS sensor rotor
     
    4 bolts and shift the brake dust shield toward the hub (outside).
     
    Axle hub from the knuckle
     
    Inner bearing race from the axle hub
     
    Oil seal
     
    Snapring and bearing
     

  4.  

To install:

  1. Press the bearing into the knuckle. If the inner race and balls come loose from the outer race, be sure to install them on the same side as before.
  2.  
  3. Install or connect the following:

    Snapring and inner race, then tap in a new oil seal until it is flush with the end surface of the knuckle.
     
    Brake dust cover and tighten the bolts to 74 inch lbs. (8.3 Nm).

    Click image to see an enlarged view

    Fig. Pressing the hub into the knuckle-SC300 and SC400

     



    Hub into the knuckle
     
    Speed sensor
     
    New locknut and tighten it to 147 ft. lbs. (199 Nm). Stake the nut with a chisel. Tap the bearing cap into place.
     
    Knuckle to the upper control arm and tighten the nut to 76 ft. lbs. (103 Nm). Install a new cotter pin.
     
    Knuckle to the lower control arm and tighten the nut to 92 ft. lbs. (125 Nm). Install a new clip.
     
    Tie rod end to the steering knuckle with the nut. Tighten the nut to 36 ft. lbs. (49 Nm). Install a new cotter pin.
     
    Rotor by installing the 2 screws.
     
    Caliper support bracket and tighten the bolt to 87 ft. lbs. (118 Nm).
     
    Speed sensor to the knuckle and tighten the bolt to 69 inch lbs. (8 Nm).
     
    Front wheel and tighten the lug nuts to 76 ft. lbs. (103 Nm).
     

  4.  
  5. Lower the vehicle.
  6.  
  7. Check the front end alignment and ABS speed sensor signal.
  8.  

 
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