Greetings, and welcome to our forum. Glad you found us.
I am afraid that I am not familiar with enough with the DYT4000 to suggest a value. A lot would depend on the hours and condition of the machine as a whole. Someone who is more familiar should be along and offer some info. Good Luck!
It can be a bit tedious trying to estimate the value on a tractor without knowing it's condition or hours, but I did a search on the Craftsman DYT 4000 and from others I have found, the closest estimation to the value of your tractor would range from $800 to $950, depending on the condition.