We have a 4200 cst tractor that we cant get the clutch to work at all. We tore the tractor apart due to a broken pto brake housing and some transmission problems. We reassembled it by the repair manual that we bought for that tractor, however we now cant seem to get the clutch to work. the gears all shift smooth with tractor off but when we start it the clutch wont work so we cant get it in gear. I am beginning to get a little disgusted and don't know what to do next. anybody have any ideas