Massey ferguson 240 steering question?

Either the rear wheels are locked to each other (last time it got stuck in the mud) or the three point hitch in back has to much weight or is lifting the brush cutter keeping the weight off of the front wheels. I would ask Grandpa or some other farmers in the area. Better check the oil level and the hours meter not servicing the oil and knocking the dust out of the air filter you don't want to ruin the motor so be careful. Tractors are dangerous machines. Good Luck