05 cat MTL 257B loosing hydraulic pressure .

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daddygoose

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Joined
Apr 2, 2011
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40
I have an 05 cat 257b skid steer with brand new perkins engine , resealed all 4 cylinders and no leaks. So far I've replaced the bypass valve in the back that releases pressure to lower the boom. I've replaced the main PRD on the valve assembly part # 456-1787. After the machine has been running for an hr or so it starts loosening hydraulic pressure to the point it want turn left or right if the cutter is still running. This is with the AC not running. Also the cylinders leak down pretty quick also even though they have been newly re sealed. My question is what is a common device that ties all these problems together other than the two items I've already replaced.
 
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