Just bought bx1500. Pto engages. Pto selector in mid and rear only runs rear pto. In mid position nothing spins. In rear position gears grind pops back to mid and rear position which is center position of contoller. When unloaded high and low range both worked now only turtle will move unit. Brake pedal floppy. Has fel and mower deck. Fel works. Mower will not engage, shaft is not frozen, gearbox on mower spins. ??????