Posted by JDseller on February 15, 2012 at 06:29:27 from (208.126.196.144):
In Reply to: Re: 401B john Deere posted by Tx Jim on February 15, 2012 at 04:20:53:
The valve in the end of the three point lift piston can be called several things: Thermal relief valve, pressure relief valve, etc. It does not react to heat it just allows allows the system to relief pressure if it get too high. That can be from heat expansion . It usually is from a spike load on the three point. Like bouncing a set of plows when you hit a bump with them up. I have seen them stick open and then if the operator does not know any better and leaves the three point control lever in the up position then it will dump oil right back into the sump. I know it is not a common thing. I just included it to show that there are too many things to diagnose in an email.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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