The only "shimming" to be done to the MCV (steering) pump is the gasket between the MCV or spacer plate and the center section. there are two different thicknesses. The repair manual says to use the thinner one if you can determine that is what was on the tractor originally or else use the thicker one.
Whining is usually caused either by air entering the pump or a mismatch of gear tooth angle. When replacing the gear you need to make sure that you have the 25 degree pressure angle gear. 06 and early 56 series tractors used a 20° tooth that will fit but they will be noisy and running a mismatched set will ruin both gears.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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