IH 544 Hydro won't move....easily

Hi all, hoping some greater minds than my own can help here.
I have a Farmall 544 Hydrostatic transmission tractor, serial # 12744, that stopped moving forward or backward suddenly one day this past September. Just having time now to dig into it. PTO, 3 point hitch, and power steering all work.
So far I have:
-drained all hydraulic oil(looked clean and clear), changed filter, and refilled with new oil, bled air out of system. Had hopes that a would do it, but no change.
-adjusted the foot-n-inch valve stem. No change.
And
-taken off the "Z-plate" to see if the forward and reverse speed select lever might be shifted off course. I found that when I move that lever to the far right for forward and far left for reverse(this is with the guide plate off, so I moved the lever very far to the right and left), the tractor will move a bit forward and backwards. But not consistently.
Anyone have some clues as to what may be going on here? Things I can check to make a diagnosis?
Appreciate any ideas!
-JN
 
I would suggest calling Herr's Machine they are without a doubt the masters at the international/farmall hydro unit. good luck
 

Explain, please, what the term ''easily'' at the end of your thread title means.

Have you checked the charge pressure?
 
Hi! I was referring to this part of what I wrote "I've taken off the "Z-plate" to see if the forward and reverse speed select lever might be shifted off course. I found that when I move that lever to the far right for forward and far left for reverse(this is with the guide plate off, so I moved the lever very far to the right and left), the tractor will move a bit forward and backwards. But not consistently."

I haven't checked charge pressure, that will be a first for me. I think we probably have the tools to do it in the shop. Thankfully Herr's has a video explaining how to do it, though I'll have to search around a bit to see what pressures I would be hoping to read.
 

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