Wheel Hub: Service and Repair

Front Hub and Disc (4WD Model)





Disassembly
1. Move the transfer case lever to the 2WD position.
2. Raise the vehicle with a jack. Support the frame with chassis stands.
3. Remove the brake caliper from the bracket. Secure the caliper with a wire that it does not interfere with the work process.
4. Remove the disk rotor.
Apply penetrating oil to the bearing and disc rotor contact surfaces if the surfaces are stuck together because of rust.
5. Inspect the hub unit bearing.





6. Use a dial gauge to measure the bearing axial rattle.
Bearing axial rattle: 0.05 mm max
If abnormal conditions are discovered during inspection, go to Step 7. If there are no abnormal conditions, reassemble the front disc rotor and caliper.
7. Loosen the caulking around the front drive shaft nuts.
8. Remove the nuts and discard them (they cannot be reused).
9. Remove the 4 bolts fixing the hub unit bearing to the knuckle.
Apply penetrating oil to the bearing and knuckle contact surfaces if the surfaces are stuck together because of rust.





10. Temporarily install long bolts to 2 of the fixing bolt holes (the bolts must have the same diameter and thread width).
11. Strike the long bolts with a hammer to loosen and remove the hub unit bearing from the knuckle.
- Take care not to strike the front drive shaft.
- Take care not to drop the bearing.
12. Remove the ABS rotor sensor from the bearing.





13. Remove the wheel pin.

Inspection
Inspect the parts listed below for abrasion, breakage, and other abnormal conditions.
Repair or replace the parts as required.
- Disc
- Caliper
- Drive shaft oil seal
- ABS sensor rotor
- Wheel pin
- Hub unit bearing

Reassembly





1. Install wheel pin.
- Place hub on a wood workbench or a block of wood approximately 6" by 6" to protect the wheel stud ends and threads.
- Install wheel stud, using a hammer.

NOTE: Be sure wheel stud is started squarely and seats completely.

2. Install the ABS rotor sensor to the hub unit bearing.
Tighten the bolts to the specified torque.
ABS rotor sensor bolt
Torque: 18.7 +/- 5 Nm (1.9 +/- 0.8kg m)
3. Install the hub unit bearing to the knuckle. Tighten the bolts to the specified torque.
Hub unit bearing bolt
Torque: 103 +/-10 Nm (10.5 +/-1 kg m)
If there is rust on the bearing and knuckle contact surfaces, use sandpaper to remove it before installation. Take care not to push the front drive shaft and oil seal out of position
4. Hand tighten the front drive shaft nuts.
Use new nuts.
5. Install the disk rotor.
6. Install the brake caliper to the bracket.





7. Tighten the front drive shaft nuts to the specified torque.
Front drive shaft nut
Torque 245 +/- 19.6 Nm (25 +/- 2 kg m)





8. Caulk the front drive shaft nuts.
The caulking must be free of cracks.