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Message: <blockquote data-quote="River Fluid Power" data-source="post: 120370" data-attributes="member: 21921"><p>The relief valve that says 3400 psi is a high pressure relief for the loop between the pump and motor. The case pressure should only be around 20 psi or thereabouts. If you have internal damage on any part that seals in system pressure, it can leak out into the case. This would cause external leaks at the pintle covers. The pintle covers are the small, thin plates held on by torque screws. Internal damage to any flat surfaces that run against each other, or damage or stretching out of the piston bores is what you are looking for inside of the pump.</p></blockquote><p></p>