Hissing noises indicate a vacuum leak. You should be able to pinpoint the leak by spraying some carb cleaner around suspected leaks. You can also listen through a piece of rubber hose used like a stethoscope. Most likely places to leak are intake manifold gasket, carb gasket, crack in manifold, and any vacuum lines that may have come off. If there is a vacuum fitting on the carb, it may have had a cap on it that could have come off. Head gaskets would not normally cause a hissing noise or vacuum leak.
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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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