IAC (Idle air control) valve stuck, very common. Some come apart (most Fords for ex) for cleaning, carb cleaner in the vacuum control line may help. It senses engine temp and increases the idle speed accordingly to keep it around 900rpm no matter whats' going on. If you turn the wheels, a pressure switch in the power steering high pressure line will increase rpm so it doesn't stall when parking and you do not have to add gas, turning on the a/c will trigger the IAC to increase rpm as the compressor draws power............ Just a couple of examples. Easy to find
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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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