Posted by JDseller on November 21, 2010 at 08:50:19 from (208.126.196.144):
In Reply to: John Deere.. hydraulics posted by Cliff hobby farmer on November 21, 2010 at 06:36:44:
Cliff is that a 2520???? I have not heard of a 2530 tractor. If it is a JD 2520 JDEMArris is correct that the external seal is to only keep low pressure rerun oil in and dirt out. If the oring on the shaft that keeps high pressure oil out of the return section is bad it will push the seal out. Also there is a small return line the comes off of the pump. This line is plastic and goes back toward the rear of the tractor. If that line is plugged or blocked it will cause the seal to fail too. The design is that they know some oil will seep past any seal they had there so they made another section the returned that oil back into the system. You can get the lower pressured oil sealed with just a lip seal.
Go to jdparts.com and search the part number R39729 this the oring that seals the high pressure oil in. Look on a breakdown of the hydraulic pump.
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