Removal and installation
See section "Disassembly and assembly of the rear axle". After installation, check the operation of the axle shafts under road conditions.
Checking the technical condition
The parts included in the axle shaft kit must meet the following requirements:
- the bearing must not have any damage or wear; if the axial clearance in it exceeds 0.7 mm, replace it;
- the retaining ring and bearing must not be displaced relative to the original fit;
- if the inner bearing ring rotates relative to the axle shaft seat, replace the retaining ring;
- the axle shaft must not be deformed, and the mounting surfaces must not have any scratches or damage. The axle shaft runout, measured at the centers on the journal under the seal, must not exceed 0.08 mm.
Before installing in the centers, thoroughly clean the centering holes on the axle shaft from dirt and rust. Eliminate minor bending of the axle shaft rod by straightening on a press. After straightening the rod, the runout of the flange end measured in the centers should not exceed 0.05 mm. If the runout of the flange end is higher than specified, but not more than 0.08 mm, then it is allowed to turn it to eliminate the end runout. Reduction of the flange thickness due to turning is allowed by no more than 0.2 mm.
Disassembly
Use the half rings of the A.74108/R device to encircle the bearing and install the axle shaft vertically so that the half rings rest on the thrust ring. Place the axle shaft under the punch and apply gradually increasing force until the bearing retaining ring is removed. Do not reuse this ring, replace it with a new one.
Check that the axle shaft seating surface is free of scratches or damage; if necessary, replace the axle shaft with a new one.
The A.74108/R device consists of a support cup and two half rings. The support cup is made of a pipe with an outer diameter of 180 mm, an inner diameter of 154 mm, and a height of 130 mm. In the upper part of the cup, a socket with a diameter of 155 mm is machined for the centering belt of the half rings, the height of the socket is 24 mm. The half rings have an outer diameter of 165 mm, which transitions in steps to a diameter of 155 mm at a height of 15 mm from the top. Two sockets are machined in the half rings: the lower one with a diameter of 72 mm for the axle shaft bearing and the upper one with a diameter of 49 mm for the thrust ring of the bearing. The sockets have thrust flanges.
Assembly
Install the axle shaft 2 vertically (Fig. 131), resting its flange on the ring 1 (A.74107/R) of the device. Install the axle shaft bearing oil deflector and the mounting plate 6 with the gasket, previously connected to each other with two screws, onto the axle shaft, install the axle shaft bearing 3. Insert the new locking ring 5 into the special collar 7 (A.74107/4R), place in the oven and heat the ring to approximately 300°C so that when it is pressed onto the axle shaft its temperature is 220–240°C. Press the locking ring onto the axle shaft using mandrel 4 (A.74107/2R) on a press with a force of no more than 6000 kgf so that the inner bearing ring is clamped between the locking ring and the flange of the axle shaft. After pressing, make sure that the ring does not shift under an axial load of 2000 kgf. To do this, install the axle shaft assembly on the A.95601/R device (Fig. 132), and clamp the locking ring 4 in a special vice, placing the indicator leg 1, with a division value of 0.01 mm, against the flange of the axle shaft 2. After setting the indicator pointer to zero, apply the specified axial load, creating a tightening torque of 8-8.5 kgf·m on the screw of the device using a torque wrench 3. The screw rests against the end of the axle shaft through the ball. In this case, there should not be even the smallest gap between the locking ring and the inner ring of the bearing 5. After removing the load and unscrewing the screw of the device, the indicator arrow should return to the zero position; this proves that there has been no shifting of the axle bearing retaining ring. Otherwise, replace the axle with a new one.
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