When you move the quadrant lever to a position, it moves the "hole" part of the valve out from under a "cover," allowing oil to flow out the hole.
Some part of the hitch mechanism is connected to the cover part of the valve, so that when the hitch moves, the cover moves. Things are timed such that when the hitch gets to the desired position, the cover has moved back over the hole, stopping hydraulic flow.
We had a 560 with the tel-a-depth system for many years. Of course we never used the fast hitch for plowing or anything like that. It was an adjustable-height drawbar and it made a great bead breaker for tires. The tel-a-depth worked just fine.
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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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