I have a MW BF10 wheel rake that has single acting hydraulic cylinders on the raise and lower for the wheels. My problem is they are slow to go down I have looked for orifices and there are none in the hyd plumbing. I use it on a 4020. I have tried it on a 4240 and a 4430 and neither will allow the wheels to go down. the cylinders have springs attached to them to help them lower. I have taken the cylinders loose and moved them up down by hand and they work fine. I am at a loss as to why they wont just drop down any help??