hydrostat problem

I am trying to help a customer with a Cub Cadet 7275 that has a completely destroyed charge pump gear. The center gear has shattered into 6 pieces and is impossible to measure to try to find some kind of substitute part that might fit. The charge pump part number appears to be a MA-19641301291...

I have a farmall 31 that had sat for awhile, after starting it would barely move and the peddle would shutter really bad and after 30 seconds it took off like normal. it then seemed to loose speed and would only move under low rms, now after sitting for a couple hours in the cold it wont move...

I have a kubota B1750 HST 650 hours. The only problem I have with it is that the hydrostat pedal is hard to move. Also when I press it to go forward and then let off of it, it does not return back to "neutral". It also does the same in reverse. I have greased the zerk on the pedal itself and...