Well Kent I have done more of these than I could begin to count.
You are correct in that the clutch plate does not run directly on the flywheel. The wear/separator (#10 & #3 ) plates do run on the drive pins(#9). The tractor in question was ran long past the time it should have be rebuilt. The pins are shot. The separator plates and the clutch plates are shot as well. I do not see how they could still be flat when they where ran this long while slipping. This mechanic is just trying to only put new clutch disks back in it, nothing else.
Now what I meant by having the flywheel machined. ( I did use the wrong term when I wrote re-surfaced. Sorry about that if it caused confusion. I often think faster than I can type or vise versa) We do have the total stand height machined down on the early 30 and 40 series JD flywheels. There was a service bulletin in the early 1980s on this. The total dimension is about .030 shorter than it would have been from the factory. Waterloo factory DTAC told us to do this years ago to increase the clamping pressure put on the clutch plates. This will make the clutch plates last longer.
The local machine shop has the exact dimension it needs to be. They have been doing them for years.
The point of the post was that the cheaper mechanic is going to cut corners and do an inferior job.
Thanks for pointing out my decription error. Other may have been confused as well. I often have trouble getting my thoughts on paper so to speak.
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