The problem turned out to be the wrong pressure plate. When I took the old pressure in to be rebuilt, the shop was not able to rebuild my old unit so they ordered a rebuilt from another shop. When it came in a week later of course my old pressure plate was already in a pile somewhere else so no side-by-side comparison was done.
This model tractor uses two different transmissions, a hi-lo-reverse and a constant mesh transmission which is what I have. The constant mesh transmission has an extra shaft which is run off the pressure plate with a set of splines. The pressure plate I got is smooth inside and fit just over the splines on the shaft. That is why I was getting a grinding noise and why the pump wasn't working. Actually it probably was turning just a little which explains a dribble of oil thru the lines.
So now I have the pleasure of breaking the tractor apart again and installing the right part. Thanks to each of you for your replies and interest.
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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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