Posted by JDseller on February 16, 2012 at 00:04:07 from (208.126.196.144):
In Reply to: Re: 401B john Deere posted by Tx Jim on February 15, 2012 at 09:18:06:
I never had one go bad until about ten years ago either. I have had about one a year since then. The only thing I can think of that would be causing it is moving large round bales. A 5 x 6 bale of alfalfa hay can go close to a ton. These guys will take a three point mover on a JD 2020 (or other similar tractor), without any front weights. They just ride the wheelie to get through the mud/snow etc. Some of these guys are nuts on how they drive them.
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.
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