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    Help with hp400 short head

    We are trying to make 1/2 stone with our 400. I get a hp300 crusher before it crushing from 5 inch stone down to 1 inch and 3/8. The 400 is set 5/8( foreman decision). I have tried it at 3/4 inch, 7/16 and half inch but every time it overs amps before becoming choked. Any help please
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