Posted by Tx Jim on February 16, 2012 at 03:40:17 from (67.142.163.22):
In Reply to: 401B john Deere posted by barnE on February 14, 2012 at 09:03:29:
JDseller said: (quoted from post at 03:04:07 02/16/12)
You are right in that it usually is the orings/backup rings around the control valves that are the most common three point leak.
My MAIN idea in my posting was to get Ken to make sure his pump was the cause of his problems. You and I can argue all day about the fine details of each other's postings. You see break downs in TX that I don't see here. I have repairs that you don't see there.
As far as the AT21781 thermostatic control valve. I must not be the only one needing them. John Deere still has them in the warehouse and you can still buy one. If they never sold one then they would drop the part.
Also the "thermostatic control valve" is just a pressure relief valve. Temperature will not open it unless you have the lift piston clear full of hydraulic oil and heat makes the oil expand therefore building pressure.
As far as JD stocking a AT21781 valve that is no indicator it's a fast moving or regular selling part. JD stocks 2 cyl parts that I'll bet aren't daily sellers. I never indicated no valves were sold as I replaced some as a cautionary thing so as not to have to "re-lick the calve" JD named the valve thermostatic not me. And yes heat can cause it to open hence I guess it's JD NAME. They're are several dairies in Tx that feed large sq's of Alfalfa. I've got a large dairy just 3 miles from me.
Finally I totally agree it's much better to diagnose the hyd system that throw high $$$ pumps at it.
This post was edited by Tx Jim at 03:41:52 02/16/12.
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