The structure of claim 11 further characterized by and including a hydraulic ram on the frame for rotating the bowl, a hydraulic circuit connected to the ram and to the bowl clamping means and constructed so that, a mine machines for sale , when the bowl clamping means is applying a partial clamping pressure, the ram will be operated to rotate the bowl and, when the ram reaches the end of its extension, the bowl clamping means will automatically apply full clamping pressure. The structure of claim 12 further characterized by and including means for releasing the full clamping pressure of the bowl clamping means, and means for isolating the hydraulic ram when the bowl clamping means is fully unclamped.
The structure of claim 12 further characterized by and including at least two hydraulic rams, one disposed to rotate the bowl in one direction and the other disposed to rotate the bowl in the other direction, means for selectively energizing either one ram or the other, and means for isolating one ram when the other is operated, machines used for crushing in Spain . The structure of claim 5 further characterized by and including a ram for rotating the bowl, means for applying hydraulic pressure simultaneously to the ram and bowl clamping means so that the ram will rotate the bowl automatically when the clamping pressure is relieved a sufficient amount to allow the bowl to rotate, and means for automatically relieving the hydraulic pressure to the clamping means responsive to the buildup in pressure when the ram reaches the end of its stroke so that a full clamping thrust will be automatically reapplied to the bowl.
The structure of claim 5 further characterized in that the bowl clamping means includes a plurality of springs disposed about the crusher to apply a clamping thrust to the bowl, and the means for relieving the clamping thrust includes a hydraulic circuit with at least one hydraulic cylinder for compressing the springs to release the bowl so it may be adjusted.