NH WorkMaster 33 Ford F5000 NH T 4.90 Ford 2110 JD555B
Check all your linkage make sure nothing has loosened up or fallen off. Hopefully you will find something on the outside. Our problem with our 6640 was it wouldn't raise and we finally found bent/broken linkage internally caused by a worn bolt head. Here is the link to the thread on our 6640 3pt problem