Well, all your comments have given me second thoughts. I called the owner yesterday and told him I wanted the machine before I saw all your comments. He again made reference that if I needed to repair it, it would ONLY cost about $3,000 and I'd still have a good tractor.
I really dont' want to buy a fixer-upper--as most of you know, I have a yard full of them. I also checked on the price of a new hydro--$2,521.96, so the repairs will be more than $3,000 I suspect as you have to separate the tractor to replace the hydro. $7,000is about the limit of my budget for this right now.
I'm going to get a cost estimate on the repairs from the Kubota dealer and see what THEY say the cost will be. Then I'll discuss it with the owner again. He's pretty firm on the $7,000 and tt would be real hard to give it any type of time-based test due to it being 70 miles from here. So, I may need to pay the owner an inconvenience fee and keep looking.