Oil does not compress nor expand (maybe a little when heated). Since the back end of the cylinder has more area than is displaced by the front side of the piston, it's physically impossible for the rods to extend if the cylinders are full of oil without introducing more oil or air to the cylinder. The rod seals allowed air to be drawn in. The air then migrated to the rear side of the piston so the bucket could drop.
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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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