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The structure of claim 6 further characterized by and including hydraulic rams on the crusher for adjusting the bowl, means for automatically releasing the full hydraulic clamping thrust on the bowl at the beginning of excursion of the rams, and means for automatically stopping the decrease in bowl clamping pressure at a pre-selected lower pressure.<a href="http://www.goodcrusher.com/industry/gold-ore-crushing-equipment.html">Gold Ore Crushing Equipment</a>. The structure of claim 7 further characterized by and including automatic means compensating for leakage in the bowl clamping hydraulic pressure during full clamping thrust.

The structure of claim 6 further characterized in that the bowl is mounted for adjustment in the main frame by screw threads and adjustment thereof takes place by rotating the bowl, the hydraulic clamping thrust being directed upwardly to remove thread clearance between the bowl and main frame. The structure of claim 5 further characterized by and including at least one hydraulic ram on the crusher for rotating the bowl,<a href="http://www.goodcrusher.com/industry/gold-wash-plant-for-sale.html">Gold Wash Plant For Sale</a> means responsive to the ram being pressurized for automatically relieving the full hydraulic upthrust, means for automatically stopping the decrease in bowl clamping pressure at a point where the bowl may be rotated by the ram but is still in full contact with the main frame, and means for automatically holding the bowl against slippage during the retraction stroke of the ram.

The structure of claim 5 further characterized by and including means for relieving any buildup in the hydraulic clamping pressure during bowl adjustment due to the bowl movement against the bowl clamping means so that the bowl clamping pressure stays at a level that will allow adjustment of the bowl.
The structure of claim 5 further characterized by and including a hydraulic ram on the crusher for rotating the bowl, automatic means compensating for leakage in the bowl clamping hydraulic pressure during full clamping thrust, and means for isolating the automatic leakage compensating means during adjustment of the crusher.