I agree with the above post, seeing the parts diagrams broke down and exploded view is priceless. Parts manual is an excellent supplemental choice.

 

I second the above as well. Buy the parts book, it's great info when you need to order parts and gives you a clear schematic overview on the assembly.
And if you are into the electrical repairs, get that manual also. This book gives you step by step procedures to deduct electrical failures of any kind for electronic and electrical components.

I make a copy of the chapter from the manual that I will be using for my repairs, so the original does not get dirty with grease, dirt and oil from my fingers.
Oh and get the proper tools that are required to do a repair. This will save you time and prevent mishaps and costs that can set you way behind due to unforeseen damages on parts.