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 driveshaft against other parts when removing or installing the driveshaft. 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:
^ MB990211: Slide Hammer
^ MB990242: Puller Shaft
^ MB990244: Puller Bar
^ MB990767: Front Hub and Flange Yoke Holder
^ MB991354: Puller Body
^ MB991897: Ball Joint Remover
REMOVAL SERVICE POINTS
[[A]] DRIVESHAFT NUT REMOVAL
CAUTION
Do not apply pressure to wheel bearing by the vehicle weight to avoid possible damage when driveshaft nut is loosened.
Use special tool MB990767 to fix the hub and remove the driveshaft 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 driveshaft by hand.
2. If it is difficult to push out the driveshaft by hand, use special tools MB990242, MB990244, MB991354 and MB990767 to push out the driveshaft 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 driveshaft 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/DRIVESHAFT NUT INSTALLATION
CAUTION
Before securely tightening the driveshaft nuts, make sure there is no load on the wheel bearings. Otherwise the wheel bearings will be damaged.
1. Be sure to install the driveshaft washer in the specified direction.
2. Using special tool MB990767, tighten the driveshaft nut. At this time, tighten the nut to the specified lower limit torque so that the pin hole may align with split pin.
Tightening torque: 196 - 255 N-m (145 - 188 ft-lb)
3. If the pin hole does not align with the pin, tighten the driveshaft nut [less than 255 N-m (188 ft-lb)] and find the nearest hole, then fit the split pin.
INSPECTION
WHEEL BEARING ROTATION STARTING TORQUE AND END 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: 196 - 255 N-m (145 - 188 ft-lb)
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 N-m (12 in-lb)
5. If the rotation starting torque is not within the limit when the nut is tightened to 196 - 255 N-m (145 - 188 ft-lb), 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 end 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 196 - 255 N-m (145 - 188 ft-lb), replace the front wheel hub assembly.