I do not know how the 856 is set up, but most IH's are similar. My 504 lost all remote hydraulics, but had steering, same pump. I found either a check valve had trash in it or the relief had trash in it. I say either because after cleaning them, it worked.
Your problem sounds like the entire hydraulics have failed. The pump(s) have a drive gear that is keyed to the pump input shaft. When I changed my pump, the key and keyway was VERY worn. I was about to shear the key, good thing I was changing pumps.
If you have a manual or know where the pump is, I'd pull the pump and check the key. If that checks out good, look for a stuck relief or check valve.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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