Hi everyone, i have a lt2000 craftsman rider 247.28853, i was mowing the other day when all of a sudden, the auto drive pedal became very hard to push, mower slowed right down, it runs fine but i cant push the drive pedal down, thought maybe it was the belts so i change the two drive belts but that didn't fix the problem, don't see any obstructions. any ideas what is causing this? it feels like when you put the brake on and try and depress drive pedal it won't depress. it rolls fine in neutral and can chug it along in forward and reverse. any ideas what to look for? Thanks Jim