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05 Cat MTL 257B Losing Hydraulic Pressure

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It sounds like it could indeed be a bypass valve issue. I had a similar problem and replacing the valve solved it. Have you checked for any leaks in the hydraulic lines?

Check the hydraulic fluid level as well. If it's low, that could cause the pressure loss. Also, make sure the filters are not clogged.

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I had a similar issue with my 257B, and it turned out to be a faulty pressure relief valve. Replacing it fixed the issue.

You might also want to check the hydraulic pump itself. If the pump is failing, it could cause loss of pressure. Look for any unusual noises or drops in servo performance.

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