I have a john deere 6400 that won't love in gear nor will the hydraulics work proper. With the lift arms up you can here the electric housing that runs the. Lift arms running. And with the arms up the spool valve will work my bucket. Tilting the bucket up and down works. Trying to raise the bucket straight up won't work unless with the lift arms up. Any. Clue what in need to do to fix the problem. I checked the fluid and have changed both of the filters. If I turn it off and back on the tractor will move will shift from drive to reverse but then if I try to change back to drive it won't move.