In one aspect there is provided a jaw crusher including a motor providing a primary power source to a primary hydraulic pump of the jaw crusher, a crusher frame supporting a fixed jaw and a movable jaw defining a crushing chamber therebetween, a cross beam transversely mounted in the crusher frame, a toggle plate extending between the cross beam and the movable jaw, and a hydraulic system having a primary pump line powered by the primary hydraulic pump for moving the movable jaw and clamping the toggle plate. The hydraulic system includes an auxiliary pump powered independently of the primary pump for effecting movement of the movable jaw.

A crusher apparatus includes a material crushing portion with a first crushing portion adapted for movement toward a second crushing portion. A linkage subassembly is connected to the first crushing portion and includes a first and second member operable about a pivot. A force inducing subsystem exerts a counterforce of a predetermined threshold amount to the first and second members sufficient to maintain the linkage subassembly in an unrelieved position until a crushing force exerted on the first crushing portion is sufficient to cause the linkage subassembly to move into a relieved position.

A jaw crusher service tool for supporting an item during service of a jaw crusher, which has a fixed jaw and a movable jaw mounted in a crusher frame that define a crushing chamber for material to be crushed, is provided. The service tool includes a support frame for supporting the item and a jaw crusher mounting attached to the support frame for mounting the service tool on the jaw crusher. The support frame is movable about first and/or second articulation axes between a transport position and an item supporting position on the jaw crusher.