Re: JD 4020 SCV Leaks

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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