Hello, I have recently bought a 1960's Ford 641 Workmaster tractor from a small local tractor company (1 man operation) that repairs and restores old tractors. Upon buying he tractor the hydraulics were not working that great. I had to bleed the air out every time I used the tractor. so I called the guy and he took the hydraulic pump off and put a seal kit in it and reinstalled the pump. It works better, I guess, but I still have bleed the a pump once and a while. What I do is loosen the bleed screw on the hydraulic pump and wait for air bubbles to come out and wait for the 3 point hitch to start to go up and the fluid will start to come out as well. Any thoughts why this is happening? The guy will not take the tractor back so I am left to figure this out I guess. Thanks in advance.