Yes you can deduct the sales tax if you itemize. But unless you saved ALL of your recieps through out the year, it will revert back to a standardized amount which will probabally be more than whatever reciepts you can come up with.
I plow snow commercially. Mostly with my truck and plow. But since I "sometimes" use the tractor to make income (that I claim as business), then it is tax deductable.
Aside from the sales tax I mentioned, Unless you are using your tractor to make money (and then claiming that money as income) then you cannot deduct anything else.
If you do decide to use it for profit with the intent of claiming it as income, you can also write off other expences like part of the building it is stored in, electric and heat to that said building, etc. But if you decide to have a "business" and file a schedule C (I think), consult a tax advisor at least for the first year to find out what you can and cannot claim.