Posted by Paul in MN on August 03, 2008 at 19:23:56 from (207.224.92.74):
In Reply to: Rebuild or replace? posted by wallacedw on August 03, 2008 at 13:47:19:
I had a similar problem recently. By using a normal 3" x 8" standard 2 way cylinder in place of the IH cylinder, the hitch worked quite normally...good lift power and good speed.
Here is what makes the IH cylinder suspect.... It has a position limit valve in the top end of the cylinder. This little valve has a small (1/8"?) diameter pin sticking out the top end. It was possible to use a clamp like thing to clamp on to the cylinder rod and when the clamp touched the pin (by the rod retracting) then the hydraulic flow was diverted from the high pressure side to the low side. Neat system! But by now the teeny O rings in the valve and pin have totally worn out and that valve is bypassing some oil all the time.
CNH has the seal kit for the cylinder (at least they had it a few years ago when I bought it). I never really got around to rebuilding the cylinder, but as I took in 4 other cylinders to the hydraulic shop, I gave them the IH kit and my IH cylinder to rebuild. They said the internal surface of the tube was badly scored so I told them to go ahead and make a new tube for it. It might have been cheaper to just let the hyd shop supply all the O rings and seals, but I already had the kit and didn't need it for any other cylinder.
What the other responders have said is also a possibility, but I am a firm believer in starting with the simple stuff (and hopefully the cheap solution).
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