Mark,
The hydraulic valves on the hundred-series IH tractors are not positive-shutoff valves; i.e., they leak. What actually is supposed to hold the hitch up is a cross-check valve, which "should" be bolted to the bottom of the control valve you use to raise/lower the hitch AND have the hoses going to the hitch cylinder connected to it. This check valve is rectangular, about 5-1/4"x2-1/2"x1-1/2" thick; if it's not there, you're hitch is not going to stay up.Assuming the check valve is there, and the hoses are attached to it, try swapping the hoses (this particular check valve only works in one direction). If that doesn't work, try checking the cylinder as described by Bob M. to see if that's the problem - note that you will have to PLUG the hoses going to the cylinder for his test to work, and for heaven's sake don't disconnect the hoses with weight on the hitch. If you do, it's going to drop in a big hurry and perhaps get somebody hurt. Your problem is almost certainly either the check valve or the cylinder. One or both may need to be reconditioned. Hope this helps, and please be careful.
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