I know this probably isnt it, but my 632 acted just the way you describe when the bronze filter plugged up. And it was the same, using it one second, stopped the next suddenness as well. Changed the filter, and away I went.
I wasnt sure how hard it'd be to rebuild the motors. The insides of a tractor I know, a skid steer not so much. Bobcat dealer led me to believe replacing the seals wasnt a real option. Cheapest motors I've found were 600. 3-4 hours?? i take it you don't have to pull the hydrostat then? I wasnt...
The seals are out, but as we use this machine every day, I cant have it down long enough to rebuild motors. Its gotta be tear it down, and slap it back together as quickly as possible.
My drive motors on my 632 are Char-lynn, numbered 109 1052 004. I cant find these at any hydraulic parts supplier. I can find 109 1052 006 though. I know the 006 is an engineering code. Are these the same motor???? Does anybody have a great place for motors? (read cheap) Would used motors be...