Hello been long time since I've been here. Started having a problem with the rear hydraulic lift cylinders. If the cylinders are raised with out equipment (mower) the cylinders will not lower without help. I'm 145 pounds and I have to jump on the arms many times once it starts to drop as long as I stay on it will drop to lowest level. If I do have wower deck on it raises the deck just fine but when lowering the deck it is not smooth it drops sever inches at a time really bounces the tractor. Any suggestions how to diagnose the issue? Thanks for any help you can offer!