Are you sort of kidding here?
No.
You really think a dealer would pay that?
Not willingly.
Say you buy a new baler(or a used tractor from the dealer) and you already have hay on the ground, it breaks, in time you lose some hay. Is he supposed to pay for the hay?
You are postulating a different situation. In good faith the dealer sold you something with a hidden defect he did not know about. OTOH, if you can prove that he knew the machine was defective and he hid the defect when he sold it to you, then he would be liable for the hay, and a whole lot more. The element of fraud creates a situation where the guilty party is liable for any consequential damages, no matter what his sales invoice or contract with you says.
I believe that even if it was an honest mistake to start with, when the dealer was told that the work wasn't done, and still wanted the original poster to pay for it, he started moving into the fraud range. I am not a lawyer, but I am not completely ignorant of legal matters either. If I had this problem I would take the tractor to a different dealer and get a diagnosis. If he gets written, outside confirmation the work was not done, or was not properly done, the OP is going to be on a very solid footing.
As a practical matter, collecting for consequential damages might take more legal effort that it is worth, but if the OP makes the dealer aware that he has committed a fraud, the dealer may well think carefully about his next move. He does not want to get into legal trouble, and if the credit card company can be convinced that the dealer has knowingly committed fraud, the credit card company can, and will, cancel his merchant VISA account. If he can not take credit cards, his business will fall off substantially. They probably will not do it for one isolated complaint, but if there are several, the dealer will be on very shaky ground.
Let me give you an example of a similar situation that happened to me about 15 years ago:
The front tires on my care were wearing unevenly and a local tire shop had a newspaper ad for an alignment, which stated "factory trained technicians".
I took my car in and bought four new tires and then had the wheels aligned. I watched the kid run the tire alignment machine and he could not even get past the startup screen for the computer. They told me that my alignment needed no adjustment, despite the clearly uneven wear on the old tires, and gave me paperwork which indicated that.
I went back the next day, with a copy of the ad, and spoke to the manager. I asked to see the training completion certificate for the mechanic who had aligned my car. After listening to me, the manager admitted that the mechanic had not been trained, and that he had not really made any alignment ajustments, even though they had charged me for them.
I pointed out that he had fraudulently charged me for an alignment, and had falsely advertised training that the mechanic did not have.
The manager called in another mechanic from another shop who re-did the alignment properly, gave me the alignment free, and refunded the price of two of the four tires. No, he didn't want to do it, but when I explained that his shop had knowingly committed fraud and that I had written proof of it, and would complain to both the law and the credit card company, he became very willing to work out a compromise.
No, I don't do this very often, but I feel strongly that if a business commits an act which is clearly illegal, they should pay a penalty for it. This is the only way they will ever learn to treat customers fairly. Since I have owned retail operations in the past, I knew his markup on tires was well over 50%. He didn't lose any money on the deal, he just didn't make any either.