Super 88 hydraulic pressure

I have a super 88 with rebuilt hydraulic pump. With hot oil it maxes out at 1000 psi. I would like to use it on a Tedder that takes 1200 psi. Can I safely shim the relief valve this much, or will the pump center crack? Will the pump make 1200 psi if the valve is shimmed?
 
Not too easily, they are integrated into the Tedder. I have other tractors, just thought if it could lift the Tedder it wouldn?t sit around so much.
 

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