- the bearing must not be damaged or worn; if the axial clearance in it exceeds 0.7 mm, it is replaced;
- locking ring and bearing must not be offset from the original fit; if the inner ring of the bearing rotates relative to the axle shaft seat, the locking ring is replaced;
- the axle shaft must not be deformed, and the seating surfaces must not have scratches or damage. The runout of the axle shaft, measured in the centers on the neck under the stuffing box, should not exceed 0.08 mm. Before installation in the center, the centering holes on the axle shaft are thoroughly cleaned of dirt and rust. Slight bending of the axle shaft is eliminated by editing. After straightening the axle shaft, the runout of the flange end, measured in the centers, should not exceed 0.05 mm. If the runout of the flange end is more than specified, but not more than 0.08 mm, then it is allowed to turn it to eliminate the end runout. Reducing the thickness of the flange due to the groove is allowed no more than 0.2 mm.