Sometimes things are made so they can "breathe" around an opening. If it wasn't meant to be sealed, sealing it up could cause the box to pressurize when it heats up and blow out the seals around the shafts. I have known this to happen when vents become clogged.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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