Posted by Tim S on April 20, 2019 at 10:02:42 from (107.128.253.44):
In Reply to: JD 4020 SCV Leaks posted by NorthMNJD4020 on April 20, 2019 at 08:10:53:
The older style SCV's are a bit ornery to repair..but they do stay dependable for years,, the basic leaks on them are the lever shafts and the packings,top and bottom, these can be dealt with fairly easy with basic knowledge,,higher than normal pressure is not normally a reason for leakage, but the older systems do better if kept in the 2250psi range, rarely do they build up higher on their own. the lever shaft o-rings get a work out over time plainly because they are worked,, packings just get old..remove the valve and cover and you can see how the roll pin removal lets you remove the shaft seals, just pay attention to the lever position, don't take the valve completely apart,,you will find this to be a simple job and will eliminate that nasty leak cooking on the exhaust manifold.. The newer gen SCV's do require a complete O/H,, and I do a lot of them here, using some improved seals and methods of repair, which I have shared on the John Deere board..
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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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