Front Axle Hub

REMOVAL AND INSTALLATION

REMOVAL SERVICE POINTS
]]A[[ CALIPER ASSEMBLY REMOVAL
Secure the removed caliper assembly with wire, etc.

]]B[[ 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 MB990787 to fix the hub and remove the driveshaft nut

]]C[[ TIE ROD END/LOWER ARM ASSEMBLY DISCONNECTION





CAUTION:
^ Do not remove the nut from ball joint. Loosen it and use special tool MB991113 or MB990635 to avoid possible damage to ball joint threads.
^ Hang special tool MB991113 or MB990635 with rope or wire to prevent them from falling.

Use special tool MB991113 or MB990635 to disconnect the tie rod end or lower arm assembly from the knuckle

INSTALLATION SERVICE POINT
]]A[[ DRIVE SHAFT NUT INSTALLATION

CAUTION: Do not apply pressure to wheel bearing by the vehicle weight to avoid possible damage before securely tightening the driveshaft nut.

1. Face the flat side of a washer to a driveshaft nut to install





2. Use special tool MB990767 to fix the hub and tighten the driveshaft nut.
3. If the position of the cotter pin holes does not match, tighten the nut up to 255 Nm (188 ft. lbs.) maximum.
4. Install the cotter pin in the first matching holes and bend it securely.

INSPECTION
WHEEL BEARING BREAKAWAY TORQUE CHECK





1. Install the special tools MB990998 and MB990326 to the front hub assembly and tighten the nut to the specified torque.
Tightening torque: 226 ± 29 Nm (167 ± 21 ft. lbs.)
2. Measure the wheel bearing breakaway torque with special tool MB990326.
Limit: 1.0 Nm (9 inch lbs.) or less
3. Wheel bearing breakaway torque must be under the limit value and there should be no roughness when rotating the hub.

WHEEL BEARING END PLAY CHECK





1. Install the special tool MB990998 to the front hub assembly and tighten the nut to the specified torque.
Tightening torque: 226 ± 29 Nm (167 ± 21 ft. lbs.)
2. Measure the play in the hub axial direction.
Limit: 0.05 mm (0.002 inch)
3. If the play exceeds the limit, replace the front hub assembly.