Hi im having issues with my 3 point hitch on a 3032e compact tractor. Hitch will not lower at all with brush hog attached. It will raise about an inch or two but nothing going down. When I remove the brush hog from the hitch I can lower the hitch manually by putting rockshaft in position 1 and pushing down on the hitch with my hands. The hitch then has no problem raising without brush hog on. I have already checked the drop/lock valve and it is wide open so I don't think the valve is the issue. Any help is greatly appreciated thank you.