I have a Hustler Super Z XR 7 that the top caps on the hydro pumps were leaking. When I removed the cap the o ring looked flat and square but the dealer said they used to be round. They gave me new round ones and I installed and tightened everything back up. Started er up and worked the levers and they both started leaking bad right away. I then toiok the one side back off just to check that the oring was ok but everything looked good so I reassembles and tried it again. This time nothing worked. Does the system need to be bled somehow?