Long story but a good friend lost all hydraulic pressure after cleaning the filter screen on his Mahindra tractor. We felt certain the pump had lost prime so I did a little searching on the net to see what type of fix I might find. Ran across an easy method of using a air hose to pressurize the fluid reservoir in the transmission since the transmission fluid drives the hydraulics as well. Worked like a charm. Not a lot of pressure needed and itís a fix that works on any tractor with an external pump.
I first noticed the fix in one of the tractor forums and then later found this YouTube video that shows it being done with an old Ford tractor.