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Message: <blockquote data-quote="Tazza" data-source="post: 15804" data-attributes="member: 82">There are indeed relief valves for forward and reverse on both sides, as it has been mentioned earlier there are 2 on the bottom, and 2 on the top. For you to have that much power loss i would doubt the shuttle valve is stuck though. If you swap hoses at the pump, top to bottom bottom to top and see if you get good forward power and no reverse it would rule out any thoughts of the shuttle being stuck.There isn't a bronze port block on thee machines.You mentioned like wood shavings in the filter, can you give a little more detail? that doesn't sound at all good to me.</blockquote>