Behlin hydraulic motor failure

Okay, old Farmall experts, here's the latest on my 450: I'm driving it the other day, everything is fine, next thing I know, there is something wrong, tractor will not respond to input from steering wheel. I check it out, turns out that the input shaft to the Behlin motor, rotates normally, but the unit is not producing any output. It's like it's internally disconnected. Anybody know what to check first? Thanks in advance, Hugh.
 
The unit (assuming it is the common Behlin unit) is a gear motor powered device with torque sensing spool valve. It has various internal snap rings pins and valves that could cause a failure. I hope the diagram I found helps. There are too many points of failure to assign one from here. Jim
Layout and list.
 

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