it's 2004 2210 i was pushing stone for about 2 hours tractor was getting pretty warm and the pedal faded away,the tractor still moves but not very well oil in trans gets very hot, i had a u joint go bad and i tore it down replaced joint and started checking valves around pump and rearend there is about 10,check valves look ok tractor does the same slow speed forward&rev.i stopped by john deere for blueprints but they don't show the main pressure valve,i'm lost guys any advice