A crusher belt tensioning apparatus is arranged for being mounting on a crusher having a driven crusher pulley to actuate a crusher, a drive pulley drivable by a power unit, a belt extending between the crusher pulley and the drive pulley to transfer drive from the power unit to the crusher, and a tension drum mounted on a tension arm for applying a tension force to the belt. The tension arm includes a first relatively short arm portion and a second relatively long arm portion connected to the first relatively short arm portion. The tension drum is movable by a hydraulic cylinder, attached to the relatively short arm portion, between a first belt tensioning operating position in which the tension drum applies tension to the belt and a second belt non-tensioning maintenance position in which the belt is removable from the tensioning apparatus.

A crusher belt tensioning apparatus is arranged for being mounting on a crusher having a driven crusher pulley to actuate a crusher, a drive pulley drivable by a power unit, a belt extending between the crusher pulley and the drive pulley to transfer drive from the power unit to the crusher, and a tension drum mounted on a tension arm for applying a tension force to the belt. The tension arm includes a first relatively short arm portion and a second relatively long arm portion connected to the first relatively short arm portion. The tension drum is movable by a hydraulic cylinder, attached to the relatively short arm portion, between a first belt tensioning operating position in which the tension drum applies tension to the belt and a second belt non-tensioning maintenance position in which the belt is removable from the tensioning apparatus.

A horizontal shaft impact crusher and method for adjusting the same is provided. The crusher housing has an inlet for receiving material to be crushed and an outlet for material that has been crushed. The crusher housing includes an impeller, which is mounted on a horizontal shaft and which is operative for rotating around a horizontal axis, a curtain against which material accelerated by the impeller may be crushed, and an adjustment device including an adjustment bar for adjusting the position of the curtain relative to the impeller, a cross beam to which the adjustment bar is connected, the crossbeam being adjustable relative to the impeller, and a drive cylinder arranged for displacing the cross beam to set the position of the curtain relative to the impeller. The drive cylinder includes an internally mounted sensor to measure the curtain position relative to the impeller.