I went to bury my wifes horse that had to be put down. The left steering pedal would depress but not stop the tracks, occasionally it would work for a second or two but then stop. Right one works fine. Machine worked great a few weeks ago when I last used it. Has plenty of Hydraulic fluid. I have a repair manual but thought I would ask here as well for the first obvious items to look at. It is weird that it worked some times, maybe the spool valve?