I have a chance to buy a john deere 140 with a 4 way snow plow 2 rear ag tires with chains and plastic wheel weights it has 3 levers controls on the left and one on the right one foot petal on the left and 2 on the right the owner says the motor and all the hydraulics work fine and it has 1567 hours on the meter.. the paint on the tractor looks good for such an old machine..my question is how much those a tractor like this is worth..?? johnny