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Farmall & IHC Tractors Discussion Forum
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Super A hydraulic leak

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Jim Bynum - Del

02-27-2008 05:13:01




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I just overhauled my 1952 Super A hydraulic block and installed new o-rings and gaskets. I cleaned the block and parts after disassembling. I followed the I&T manual and some advice on this forum to complete the overhaul. After I put everything back together and a couple of days later, I noticed the control valves are leaking around the new boots. I installed the new o-rings on the control valve rod and used new hydraulic fluid to lube them before putting them on rod. I also rotated the rod as I installed to prevent damage to o-rings.

Anyone got any ideas what could have happened? I bought the kit from a CaseIH dealer so the o-rings looked okay to me plus I matched them up to old ones. They were a little difficult to stretch over the rod initially but went into the grooves okay.

Any advice would be appreciated.

thanks,
Jim

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kippster

02-27-2008 09:09:18




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 Re: Super A hydraulic leak in reply to Jim Bynum - Delaware, 02-27-2008 05:13:01  
I've seen spool valves leak (not profuse amounts) for a while after a rebuild because of a tiny little bit of flash, (the rubber that is left from the molding process), being on the o-ring, and therefore letting a little bit of fluid to escape from the valve body. Once the flash wore off, the control valve didn't leak anymore.



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Janicholson

02-27-2008 09:07:00




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 Re: Super A hydraulic leak in reply to Jim Bynum - Delaware, 02-27-2008 05:13:01  
If the "O"rings were a stretch over the shafts, they may be too small to fill the groove they work in. I would use teflon based rings from a quality supply house that were just a tad bigger. National and others make them. JimN



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