Never beat on the ball, you will ruin the coupler, the slightest hammer mark will make it so it will leak all the time. What you did was unhook the pine with a load on it or heat expanded the oil. Like the other poster said loosen the coupler and let a bit of oil out. That tells me you have the old style Pioner coupling femal tips. and they are not designed for coupling under pressure, There is a version designed for coupling under pressure like you had but expnsive and scarce.If you forget to put the implement lock on or leave the implement set on ground you would have to take jacks to lift the implement enough to release the pressure in the hose. If you cannot do that and try to unscrew the coupler if you unscrew that coupler too far the hose end will take of like a rifle shot and you will be badly hurt. So make sure there is no pressure on the hoses when you unhook the cylinder but if you do have to release a lot of oil to get them hooked up be very carefull in loosing that coupler and only do it just enough to get an oil drip. If you have left the cylinder under load when unhooked it make take quit a while for enough oil to drip out without blowing that coupler a thousand feet. Always make sure all pressure is released and that means shut the tractor off and move the control to release all pressure before pulling the hose. They can be very dangerous if you do not handle them correctly. If it is on a double acting cylinder 2 hoses you may be able to release head build up pressure by hooking up the other line first and with tractor shut off you MAY think mabey will be able to release enough temperature expanded oil to get the coupler to work. But always be sure to with engine off move controll lever in both directions to release all pressure.
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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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