So there in not a square block on top of the hydraulic pump with 5 or so hoses going into it?Well, I finally tackled the project today, I needed a little time away from it.. I took the blocks of the drive motors, and I didnt find any screens, just a few relief valves. with 2 small hoses going into it..Anyway I took it all apart, and soaked it for a while, Put it back together, It is better then it was, but I am still stumped about the screen..I followed the two hoses back, and they go to a valve to let the hydraulics freewheel. Please let me know if you have any other Ideas