Without photos, it is difficult to determine a whole lot of things, all of which would affect the value. Generally speaking, a running tractor with a factory-built loader should bring at least $500.00 at minimum.
If this turns out to be a MTD 990/Farm King/Dayton that is in really decent shape, then it could easily bring more. Keep in mind that location, location, location really matters also. It costs money to retrieve a tractor but if local demand is high, then a good machine will often bring a higher price.