Front Axle Hub
*This document updated per manufacturer TSB #08-26-003FRONT AXLE HUB ASSEMBLY
REMOVAL AND INSTALLATION
CAUTION
^ The magnetic encoder collects metallic particles easily, because it is magnetized. Make sure that the magnetic encoder should not collect metallic particles. Check that there is not any trouble prior to reassembling it. [Vehicles with ABS]
^ When removing and installing the front wheel hub assembly, make sure that the magnetic encoder for wheel speed detection (integrated with the inner oil seal) does not contact with surrounding parts to avoid damage. [Vehicles with ABS]
^ When removing and installing the front wheel speed sensor, make sure that the pole piece at the end does not contact with surrounding parts to avoid damage. [Vehicles with ABS]
^ The parts indicated by * are the nuts with friction coefficient stabilizer. In removal, ensure there is no damage, clean dust and soiling from the bearing and thread surfaces, and tighten them to the specified torque.
Post-installation Operation:
Removal Steps 1-9:
Removal Steps 10-14:
Required Special Tools:
^ MB990242: Puller Shaft
^ MB990244: Puller Ball
^ MB990767: Front Hub and Flange Yoke Holder
^ MB991354: Puller Body
^ MB991897 or MB992011: Ball Joint Remover
REMOVAL SERVICE POINTS
[[A]] DRIVESHAFT NUT REMOVAL
CAUTION
Do not apply the vehicle weight on the front wheel hub assembly with the driveshaft nut loosened. Otherwise, the wheel bearing may be broken.
Use special tool MB990767 to counter the hub as shown in the figure to remove the driveshaft nut.
[[B]] CALIPER ASSEMBLY REMOVAL
Secure the removed caliper assembly with wire, etc.
[[C]] BRAKE DISC REMOVAL
If the brake disc removal is difficult, use a plastic hammer to remove the brake disc.
[[D]] SELF-LOCKING NUT (TIE-ROD END CONNECTION) REMOVAL
CAUTION
^ Loosen the self-locking nut (tie-rod end connection) from the ball joint, but do not remove here. Use the special tool.
^ To prevent the special tool from dropping off, suspend it with a rope.
1. Install special tool MB991897 or MB992011 as shown in the figure.
2. Turn the bolt and knob to make the special tool jaws parallel, then hand-tighten the bolt. After tightening, check that the jaws are still parallel.
NOTE: To adjust the special tool jaws to be parallel, set the orientation of the knob as shown in the figure.
3. Unscrew the bolt to disconnect the ball joint.
[[E]] DRIVESHAFT REMOVAL
CAUTION
^ The magnetic encoder collects metallic particles easily, because it is magnetized. Make sure that the magnetic encoder does not collect metallic particles. [Vehicles with ABS]
^ When removing the driveshaft, make sure that it does not contact with the magnetic encoder (integrated with the inner oil seal) to avoid damage. [Vehicles with ABS]
If the driveshaft is seized, use special tools MB990242 and MB990244, MB991354 and MB990767 to push the driveshaft out from the hub.
INSTALLATION SERVICE POINTS
]]A[[ WASHER/DRIVESHAFT NUT INSTALLATION
CAUTION
^ The magnetic encoder collects metallic particles easily, because it is magnetized. Make sure that the magnetic encoder should not collect metallic particles. Check that there is not any trouble prior to reassembling it.. [Vehicles with ABS]
^ When installing the driveshaft, make sure that it does not contact with the magnetic encoder (integrated with the inner oil seal) to avoid damage. [Vehicles with ABS]
^ Do not apply the vehicle weight on the wheel bearing before fully tightening the driveshaft nut. Otherwise, the wheel bearing may be broken.
1. Be sure to install the driveshaft washer in the illustrated direction.
2. Use special tool MB990767 to tighten the driveshaft nut. At this time, tighten the nuts within the specified torque range considering the final tightening.
Tightening torque: 144-176 Nm (107-129 ft-lb)
3. If the pin holes do not align with the pins, tighten the driveshaft nut [less than 200 Nm (147 ft-lb)] and find the nearest hole then bend the split pin to fit it.
INSPECTION
^ Check the hub for cracks and spline for wear.
^ Check the knuckle for cracks.
^ Check for defective bearing.
NOTE: If the meshing of the wheel bearing outer race and the knuckle, or of the wheel bearing inner race and the hub, is loose, replace the bearing or damaged parts.