I think the trick to working on tractors is to have that models service manual,they get a little pricey but still cheaper than dealers service dept..........good luck
When I buy a piece of equipment if it is from a dealer I insist on a parts book as well as the service book. I do not accept only the operators book given out.
If they try to charge extra I remind them there are other dealers out there.
I have a file cabinet dedicated just to the different books for the equipment and when I'm done with service or repairs the books go back!
I'm kind of like Northern Rancher- hate steel- not much of a mechanic- and don't have much equipment anymore since I've gone "low input"--but for that I do or any I buy, usually used at an auction, I've found that with a little searching on the internet you can usually find someone thats selling a CD of the parts book and/or service manual for $5-10...