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JD 50 questions

S

shanesteinbrecher

New User

I have a JD 50 2 cylinder that I have rebuilt the power steering pump on twice. Both times is blows the front seals out. I will get about 3 to 5 hours out of running it and then it just goes. No leaks or nothing prior to it just blowing out. The second time I put a pressure gauge in line. High idle it?s got a few hundred PSI when turn the wheels is goes up to about 500 psi. holding the wheels to one side it will get it up to about 1000-1200 max. When I rebuilt it I made sure the shaft relief hole for the front seals was open. Installed 2 seals same direction to keep the oil in the pump. On the back side 2 seals. I removed the spacer washer. When I took the pump a part I followed the book for all specs. Cleaned up the 2 surfaces and put a light coating of aviation gasket maker around the edge to help seal it up.

I?m restoring this tractor and the original power steering pump was missing. I purchased a used one with the external relief on the side. According to the book it looks like the relief parts have been updated.
 
Seals go in back to back to also prevent suction leaks I think ?
I wire wheel off the rubber coating on the out side of the seals to get them to bare metal. Clean with thinner and put something like green Loctite stud and bearing mount or a hardening permetex. Seems to hold them into place.
 
Did you replace the bushings and bearing when you had it apart ? Blowing seals is because there is too much crankcase pressure due to much gear clearance, due to the sandwich plate and the sides of the gears being worn out due to worn bushings etc. .Pressure sounds abt. right . Most likely the relief valve has been shimmed so it cant work . Later pumps didn't have one. Seals go back to back and that rubber was put on there to seal the seals in the housing .
 
I did replace the front bearing. Bushing and gears all looked good. No play in the gear shaft and bushings.

Should I do something with the relief so it works correctly?

What about the plates how do I verify they are not warped? They look okay
 
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