Front Axle Hub
FRONT AXLE HUB ASSEMBLYREMOVAL AND INSTALLATION
CAUTION:
^ Do not strike the ABS rotors installed to the BJ or EBJ outer race of drive shaft against other parts when removing or installing the drive shaft. Otherwise the ABS rotors will be damaged.
^ Be careful not to strike the pole piece at the tip of the front wheel speed sensor with tools during servicing work.
Post-Installation Operation:
Removal Steps 1-14:
Required Special Tools:
REMOVAL SERVICE POINTS
[[A]] DRIVE SHAFT NUT REMOVAL
CAUTION: Do not apply pressure to wheel bearing by the vehicle weight to avoid possible damage when drive shaft nut is loosened.
Use special tool MB990767 to fix the hub and remove the drive shaft nut.
[[B]] CALIPER ASSEMBLY REMOVAL
Secure the removed caliper assembly with wire, etc.
[[C]] BRAKE DISC REMOVAL
If the brake disc is seized, install a M8 x 1.25 bolts as shown, and remove the disc by tightening the bolts evenly and gradually.
[[D]] SELF LOCKING NUT (CONNECTION FOR LOWER ARM BALL JOINT AND TIE ROD END) REMOVAL
CAUTION: Do not remove the nut from ball joint. Loosen it and use the special tool to avoid possible damage to ball joint threads. Hang the special tool with cord to prevent it from falling.
1. Replace the self locking nut for lower arm ball joint with a regular nut, because the original one is a little bit large to install the special tool. Install special tool MB991897 as shown in the figure.
2. Turn the bolt and knob as necessary to make the jaws of special tool parallel, tighten the bolt by hand and confirm that the jaws are still parallel.
NOTE: When adjusting the jaws in parallel, make sure the knob is in the position shown in the figure.
3. Tighten the bolt with a wrench to disconnect the lower arm ball joint, tie rod end and remove the self locking nut.
[[E]] FRONT WHEEL HUB ASSEMBLY REMOVAL
1. Remove the front wheel hub mounting bolts while pushing out the drive shaft by hand.
2. If it is difficult to push out the drive shaft by hand, use special tools MB990242, MB990244, MB991354 and MB990767 to push out the drive shaft from the hub and knuckle.
3. If the front wheel hub is seized, remove the knuckle together with front wheel hub and fix them with a vise.
4. Hang the drive shaft on the vehicle body with a rope.
5. Use special tools MB990244, MB991354 and MB990211 to pull out the front wheel hub from the knuckle.
INSTALLATION SERVICE POINT
]]A[[ WASHER/DRIVE SHAFT NUT INSTALLATION
CAUTION: Before securely tightening the drive shaft nuts, make sure there is no load on the wheel bearings. Otherwise the wheel bearings will be damaged.
1. Be sure to install the drive shaft washer in the specified direction.
2. Using special tool MB990767, tighten the drive shaft nut to the specified torque.
Tightening torque: 226 ± 29 Nm (167 ± 21 ft. lbs.)
INSPECTION
WHEEL BEARING ROTATION STARTING TORQUE AND AXIAL PLAY CHECK
Required Special Tools
^ MB990998: Front Hub Remover and Installer
^ MB991000: Spacer
^ MB990326: Preload Socket
^ MB990685: Torque Wrench
1. Install special tools MB991000, MB990998 and tighten them to the specified torque.
Tightening torque: 226 ± 29 Nm (167 ± 21 ft. lbs.)
2. Hold front wheel hub assembly in a vice, using wooden blocks.
3. Rotate the hub in order to seat the bearing.
4. Measure the wheel bearing rotation starting torque by using the special tools MB990326 and MB990685.
Limit: 1.4 Nm (12 inch lbs.)
5. If the rotation starting torque is not within the limit when the nut is tightened to 226 ± 29 Nm (167 ± 21 ft. lbs.), replace the front wheel bearing assembly. If there is any signs of binding or tight spots when the wheel bearing turns, replace it.
6. Measure to determine whether the wheel bearing axial play is within the specified limit or not.
Limit: 0.05 mm (0.002 inch)
7. If the play exceeds the limit when the nut is tightened to 226 ± 29 Nm (167 ± 21 ft. lbs.), replace the front wheel hub assembly.