3 point hitch

[Hard worker]

I have 1974 ford 3400 with front end loader and a bush hog on back. When I start it the bush hog will rise up. Can move the lever up and down and it will not move the bush hog. When you turn the tractor off it will go down. Is something stuck somewhere?

 

[Dman1981]

Control valve in cover or slow fast valve is turned