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Message: <blockquote data-quote="skidsteer.ca" data-source="post: 40906" data-attributes="member: 307">The correct pump would be the one farthest away from the engine. But you may want to try a new relieve valve too (if its a non adjustable like the LS 160 170). If its adjustable it may need set. But first off, does the performance seem to get worse as the oil warms up, usually thats the first sign of a weak pump. Adjustable reliefs often lose their spring tension over time resulting in a gradual reduction of max pressure, but regardless of weather the oil is warm or cold.Ken</blockquote>