I got a 2020 JD and I'm having proublems with the lift chattering when it raises up and it sounds like it has air in the system. I had a leak on the main shaft on the pump and had it all rebuilt thinking that was part of the proublem. It didn't Change it any. I drained all the fluid changed the filter took the intake screen out and cleaned it ( it was very dirty and thought it might be the proublem ) still no change. I've got JD Hy Guard in it. I've noticed that when raising the lift that the small curved hose on top of the oil cooler is trying to suck together a little while raising ( it's a new hose from Deere ) the lift making me think something isn't getting enough fluid. Anyone have any ideas where to start checking or no what might be causing this? The lift will work or pick up what ever it needs too no proublem just jerks! Thanks for any help you can give me!!