Good morning. I have a 4240 that has been acting up for awhile. I changed the screen and filter Friday and had quite a bit of shavings in it. I added oil and it worked for about 2 minutes. No hydraulics would work. Steering power lift and bucket were all dead. I noticed that before it quit that the power lift would l if the motor down when going down. I adjusted the pressure screw on the pump and it works somewhat. Maybe 25 percent. The weird thing to me is when the powerl off is down I have no hydraulics. When I raise it they somewhat work. I am thinking it is the pump but want some advice before a spend more money on this money pit. Thank you.