there should be 2 covers on the other side of the hammer that you can take off, then tap (push) the valves out in the direction of hand levers (ie, when they are out you should be able to see right through the cylinder !)
Free the ram with a block and tackle / fork truck / hydraulic jack or similar (ie push it up!)
then put some heavy matting on the bottom die, if it starts rouge hammering it will take some of the shock out of it ! -
Never sand or shot blast a hammer - 1 little piece of grit will destroy a bore in 30 seconds (and you can never get it all out!)
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