Bucket goes up and down, but will not tilt. WHen I switch then hoses the bucket tilts but will not raise and lower, When I move the joy stick I can see the hoses flex and I hean a moan from the system. I replaced 2 of the quick couplers and no change. tractor runs fine, when I have the disconnects out, I can use the joystick to see the valve move back and forth in the control block. It acts like there is a block. This happened when I was piling up brush, I lowered the bucket, pushed some brush and it would not move after that, raises and lowers fine. Hope this helps!