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Currently restoring a 1957 420w. The hydraulic pump leaks oil into the engine. Any ideas on someone who rebuilds these or where to find a good used one? Haven't had much luck finding anything.
 

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I know of no remanufactured pumps.
That's not to say there are none available, so I'm not aware of it. I've seen used pumps available, but they are very expensive.
Replacing the seals are an easy job.

In the image below, item # 9 & #10 are the culprit for introducing hydraulic oil into the engine sump. Although while the pump is disassembled, you may want to check the condition of the pump shaft(#3) and bearings (#11 & #15) and replace if necessary.
779836

779837
 

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55JD50 57JD420C 57JD420U 55JD40W 66JD110 73JD140H3 2006JDGX335 44JDBO 45JDBR 85JD750
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Check with New Paris tractor parts. They have a large bone yard of good used parts.
 
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