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Message: <blockquote data-quote="Tazza" data-source="post: 9302" data-attributes="member: 82">Groaning is usually air in the system. The system should self bleed with use but they way you have been talking the problem is still exactly the same no matter what. It really does sound like what happens when you have a blocked filter, it causes the oil to foam up. This usually only causes problems in the drive section and not the lift and tilt functions! I had this problem with an old 731 i had, the hydraulics were super tough but the drive was gutless, cleaned the filter and it was perfect. It was foaming the oil and you could hear it groaning and squeeling but ONLY while driving.I would give your dealer a call and see what they have to say, their service depot is really helpful. They will take the time to think about the problem and look it up for you, they may have encountered this before or at least know where to start looking.You have no leaks? all i can think of its drawing air in through a loose fitting but usually these will at least leak a little.</blockquote>