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Message: <blockquote data-quote="Lachlant54" data-source="post: 120238" data-attributes="member: 21931">Hi guys. I have a bobcat 453 I bought as a project. I've replaced a lot of the hydraulic hoses and some of the hoses from the hydrostatic pumps. And now I'm currently having an issue with the hydrostatic pumps leaking. The first time I found it must have built up too much pressure and had bent the cover plates underneath that cover the bearing for the steering shafts, and the sealed plugs were cocked to the side and were leaking. I replaced the o-rings and the plates and tried it and it happened again. I pulled out both relief valves and and both of them were hard to push the pins in but then they loosened up and felt easier to push in. Reinstalled them. I checked them again the next day when I fixed the plugs again and they were the same. I soaked them in hydraulic oil and gave it another go. The bottom plates aren't leaking now but the top plates were the shafts go into the pumps are leaking. Sorry for the long post but I was hoping to get a few more opinions on what is causing these new leaks to pop up. Could it be that the relief valves are badThanks guys</blockquote>