Disclosed is a materials processing apparatus comprising a frame 10 upon which a pump assembly 40 including a pump 42 for pumping an abrasive liquid is pivotably mounted. The pump assembly is pivotably mounted on the frame to be moveable between an operative position and a maintenance position to facilitate access to the pump for maintenance operations. The mounting may be by means of rotating turntable 60 whcih may comprise a ball bearing. The casing of the pump 42 may be split vertically to allow access to an impellor of the pump and its drive shaft.
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