Posted by mazemeister on January 04, 2015 at 18:39:05 from (104.148.251.168):
In Reply to: 856 IH posted by 4010tp on January 04, 2015 at 16:05:01:
further clarification on that pin-- the control valve spool is two pieces- the bottom half is inside, not visible. if you look on the bottom of the pto housing directly below the control valve, there is a hex headed plug. if you remove that and the bottom half of the valve stem falls out, that's your problem (hyd oil will leak but not too fast, just put the plug back right away and you'll only have to catch a couple cups).
to repair- parts of the hitch have to be removed for clearance, but unscrew the nut from the top of the valve stem and the whole works comes out the bottom. replace the pin and put it back.
a common cause of the pin breaking is if the over-center linkage is worn, then when you push the lever to "off" it allows the spool to drop all the way and shear the pin. if you can gently move the lever over center but "catch" the valve partway, then ease it to the "home" position, that will help to not break the pin.
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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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