Abstract: A self tightening mantle retention assembly for a conical crusher. The self tightening assembly includes a locking bolt or nut provided with external threads for engaging in internally threaded bore in the head of the crusher. The locking bolt is provided with a central bore for receiving a central bolt, the threads of which engage an internally threaded aperture formed in the head or a block secured to the upper bearing supporting the head to apply a further compressive force to the locking bolt. The threaded engagement between the locking bolt and the head and between the bolt threads and the threaded aperture in which they are received, are formed such that the torque applied to the locking bolt by the crushing action on the mandel tends to further tighten the locking bolt to secure the mantle on the head of the crusher.

Abstract: A protection arrangement for a hopper seal in a conical crusher having a material feed hopper located within the upper portion of the crusher bowl, over the crusher bowl liner. The protection arrangement preventing material and liquid flowing from the hopper into the crusher bowl from flowing against and abrading components of the hopper seal. The protection arrangement including an upwardly extending lip on the bowl liner which is received within a discharge hole in the bottom of the hopper.

Abstract: A retention and positioning device is disclosed for a crusher having a main frame with an upper seat, and an upper frame held in releasably biased relation to the main frame and including a portion engaging the upper seat during normal operation. The retaining and positioning device includes a bracket constructed and arranged for retention upon the upper seat during operation of the crusher, the bracket defining at least one pad aperture, and at least one shock absorbing pad configured for retention in each aperture. During operation of the crusher, when the upper frame is momentarily displaced from engagement with the main frame, the return of the upper frame to the upper seat is cushioned by the at least one pad.