I have JD MX8 mower. Mine is mounted and very heavy. I initially mounted it on JD 4020 (95 HP). Under most conditions the tractor handled the load just fine but in tall, wet brome, the 4020 had a load. I have switched the mower to an IH 1486 (160 HP). That mower needs horsepower and I think it would be to much for a 50 hp tractor unless used for only short, turf type grass. I have a JD 6 foot mounted mower that I use behind a New Holland TC35 (35 hp) and that mower loads the New Holland in thick tall grass. Possibly a better match for your tractor would be the MX7.