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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