Replace worn and damaged parts with new ones or repair them.
When disassembling the hubs, pay attention to the condition of the bearings, cuffs and their bushings.
Replace bearings with patchy wear, spalling, damaged inner ring collars or cages.
Wheels should be free of cracks, dents and bends.
If there are dents or bends, straighten them and paint the surface.
The radial runout of the landing flanges and the end runout of the inner surface of the wheel rim beads should not exceed 1.2 mm.
Replace wheels that have rims with broken mounting holes.
Removal, disassembly and assembly of hubs
Remove the hubs in the following order:
1. Remove the wheel from the hub.
2. Loosen the axle shaft mounting bolts and remove the rear axle axle shaft (hub protective cap, wheel disconnect clutch and front axle drive flange).
3. Bend the tab of the lock washer, unscrew the lock nut and remove the lock washer.
4. Loosen the bearing adjustment nut and remove the thrust washer.
5. Remove the hub with the drum, bearings, cuff and cuff thrust washer from the trunnion.
To replace worn or damaged bearings, disassemble the hub in the following order:
Fig. 1. Pressing out the outer race of the inner wheel bearing
1. Press out the outer race of the inner bearing with a tool (fig. 1).
Simultaneously with the outer ring, the seal with the thrust washer and the inner ring of this bearing will be pressed out.
Carry out this operation carefully so as not to damage the cuff.
Fig. 2. Removing the thrust ring of the wheel bearing
2. Remove the thrust washer of the inner bearing using pliers (fig. 2).
3. Slide the outer race of the outer bearing all the way into the lug of the hub to release the thrust washer.
Fig. 3. Pressing out the outer ring of the outer bearing of the hub
4. Remove the outer bearing thrust washer using pliers.
5. Press out the outer race of the outer bearing with a tool (Fig. 3).
Assemble the hub in reverse order, taking into account the following:
1. When replacing bearings, also replace the outer rings.
The newly installed outer races of the wheel bearings must be pressed tightly against their thrust rings, otherwise there will be a gap after adjusting the bearings.
Perform the indicated operation by tightening the bearings with nuts after installing the assembled hubs on the trunnion (before adjusting).
Be sure to install a thrust washer between the collar and the inner bearing, otherwise the collar may be damaged when the hub is removed from the trunnion.
When assembling the hub, the cuff must be pressed all the way into the thrust washer.
Fig. 4. Pressing in the cuff and the outer rings of the hub bearings
2. Press the collar and the outer rings of the bearings with an annular mandrel (Fig. 4).
3. Before installing the hub on the trunnion, fill the bearings with grease according to the instructions in the lubrication table. 4.
When assembling, remember that a heat-treated thrust washer is installed between the outer bearing and the bearing adjustment nut.
If the washer is missing, the adjusting nut may fail.
5. If there are even slight cracks on the tabs of the lock washer, replace it, otherwise the tabs of the washer may break and the nuts will self-loose (or self-tighten), which will damage the bearings.
6. After installing the hub with the drum on the trunnion, adjust the tightening of the bearings