System and method of aligning a main shaft of a gyratory crusher

A gyratory crusher, comprising:

• a main shaft having a lower portion defined by an outer surface having a first diameter and a lower end having a second diameter that is less than the first diameter, the main shaft further comprising an alignment chamfer extending from the lower end to the outer surface of the lower portion;
• a bearing assembly having an inner surface having a third diameter that generally the same as the first diameter, wherein the bearing assembly surrounds the lower portion of the main shaft when the main shaft is in an operating position;
• a dust collar having an outer diameter defined by a radial outer surface;
• a dust seal retainer mounted to the main shaft and having an inner diameter larger than the outer diameter of the dust collar;
• and
• a dust seal movably received within the dust seal retainer and extending radially inward from the dust seal retainer to contact the outer surface of the dust collar.

A gyratory crusher, comprising:

• a main shaft;
• a dust collar having an outer diameter defined by a radial outer surface and a planar top mounting surface;
• an alignment ring configured to be mounted to the top mounting surface of the dust collar, the alignment ring including a tapered contact surface extending from a lower outer edge of the alignment ring to a top edge of the alignment ring;
• a dust seal retainer having an inner wall having an inner diameter larger than the outer diameter of the dust collar;
• and
• a dust seal movably received within the dust seal retainer and extending radially inward from the inner wall of the dust seal retainer to contact the outer surface of the dust collar, wherein the position of the dust seal within the dust seal retainer can be adjusted.