The main relief is the one that is causing the pump to crack, on rare occasions a hose will seperate internally and cause a blockage which could destroy a pump but let's assume thats not a problem. The relief in question is in the section that is the first in line from the pump and has preference over all other reliefs, hence it's name "main relief". Once it is set properly you can use the info given to check all the other reliefs. You need not lower all valves, concentrate on the main relief.
Most newer units had the main relief contained in the loader valve which controlled the pressure in both loader and hoe but some early ones had the hoe valve first in line. Generally, the pump output line went to the valve that contains the relief and the relief was contained in the first section where the oil comes into the valve.
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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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