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In Reply to: 1951 D4 Caterpillar posted by Patti on Wednesday, July 16, 2008:

remove the top access cover plate, it should have just 2 bolts. Then find the nut shown in the pic with the arrow pointing at it. You may have to shift into N and turn the clutch by hand until it comes to the top. Loosen nut. I use a 3/4 deep socket on a u-swivel with one or two extentions.
It is not the easiest thing to get at, but it can be done.
Put trans in gear and grab where the clutch finger are and rotate that assembly clockwise maybe a 1/4 or so. Work the clucth and feel if it is a little hard to pull overcenter. Ajust more or less as needed till the pull feels correct.
Now you might have to go back to N and spin that part back up, to be able to tighten the nut. Tighten the nut and put the cover back and you should be good to go.
If you can't adjust it enough, you clutch disk is probably done and you will have to replace it.
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