With Drum Brakes
DISASSEMBLY AND REASSEMBLY
<6G74 and VEHICLES WITH ABS>
DISASSEMBLY SERVICE POINTS
RETAINER REMOVAL
1. Remove one retainer bolt from the backing plate.
2. Apply gummed cloth tape around the edge of the bearing case for protection.
CAUTION: Be careful not to damage the bearing case and the axle shaft.
3. As shown in the figure, hold the axle shaft. Using a grinder, shave off a point of its circumference locally until the wall thickness become as follows:
- 1.0 - 1.5 mm (0.04 - 0.06 inch) for axle shaft side
- 2.0 mm (0.08 inch) for bearing side
CAUTION: Be careful not to damage the bearing case and the axle shaft.
4. Fix the axle shaft and shave off the remaining 2.0 mm (0.08 inch) on the side of the retainer bearing.
CAUTION: Be careful not to damage the axle shaft.
5. Cut in with a chisel the place where the retainer ring has been shaven and remove the retainer ring.
AXLE SHAFT REMOVAL
1. Secure special tool MB991552 to the bearing case bolts with the nuts installing the plate and nuts in that order and adjust the height of the hanger.
2. Place the end of the bolt against the center of the axle shaft, and then tighten the bolt to remove the axle shaft from the bearing case assembly.
<6G74 and VEHICLES WITH ABS>
CAUTION: The hanger and plate should be placed so that they are parallel.
1. Secure special tool MB991552 to the bearing case bolts with the nuts installing the washers, plate and nuts in that order and adjust the height of the hanger.
NOTE: The washers are used to eliminate the difference in height of the bearing case so that the plate and the bearing case are parallel.
2. Place the end of the bolt against the center of the axle shaft, and then tighten the bolt to remove the axle shaft from the bearing case assembly.
Install special tool MB990560 as shown in the illustration, and then use a press to remove the outer bearing inner race from the axle shaft.
Install special tools MB990786 and MB990801 as shown. Turn the center bolt clockwise to force the bearing outer race out.
<6G74 AND VEHICLES WITH ABS>
Reinstall the outer bearing inner race that was removed previously. Use special tool MB990799 and a press to remove the bearing outer race.
ASSEMBLY SERVICE POINTS
>A< BEARING OUTER RACE INSTALLATION
Use special tools MB990937, MB990938 to press-fit the bearing outer race to the bearing case.
<6G74 and VEHICLES WITH ABS>
Use special tool MB990890 or MB990891 to press-fit the bearing outer race to the bearing case.
>B< INNER BEARING INNER RACE/OUTER BEARING INNER RACE INSTALLATION
1. Apply multipurpose grease to the roller surface and ends of the bearing.
2. Pass the axle shaft through the bearing case and the inner bearing inner race and outer bearing inner race.
CAUTION: Both the inner bearing inner race and outer bearing inner race should be press-fitted together.
3. Use special tool MB990799 to press-fit the inner bearing inner race and outer bearing inner race to the axle shaft.
>C< BEARING INNER RACE INSTALLATION
1. Apply multipurpose grease to the roller surface and ends of the bearing.
2. Place the bearing case and the bearing inner race onto the axle shaft in that order.
3. Use special tool MB990799 to press-fit the inner bearing inner race and outer bearing inner race to the axle shaft.
>D< OIL SEAL INSTALLATION
1. Apply multipurpose grease to the external periphery of the oil seal.
2. Press-fit the oil seal into the bearing case until it is flush with the face of the bearing case by using special tools MB990934, MB990936 or MB990938.
3. Apply multipurpose grease to the lips of the oil seal.
>E< RETAINER INSTALLATION
Use special tool MB990799 to press-fit the retainer to the axle shaft. Check that the press-fitting force is at the standard value.
If the initial press-fitting force is less that the standard value, replace the axle shaft.
Standard value:
>F< SNAP RING INSTALLATION
1. After installing the snap ring, measure clearance (A) between the snap ring and the retainer with a feeler gauge. Check that it is within the standard value.
Standard value (A): 0 - 0.166 mm (0 - 0.0065 inch)
2. If the clearance exceeds the standard value, change the snap ring so that the clearance is at the standard value.
Example:
Clearance 2.0 mm (0.08 inch)
Standard value 0 - 0.166 mm (0 - 0.0065 inch)
Thickness of snap ring 2.01 mm (0.079 inch)
>G< ABS ROTOR INSTALLATION
Use special tool MB990787 to press-fit the ABS rotor so that the distance (A) to the bearing case is at the standard value.
Standard value (A): 19.4 - 20.0 mm (0.76 - 0.79 inch)
INSPECTION
- Check the dust cover for deformation and damage.
- Check the inner and outer bearings for seizure, discoloration and rough raceway surface.
- Check the axle shaft for cracks, wear and damage.