Posted by Unreserved dick on June 26, 2009 at 09:00:25 from (4.227.249.5):
In Reply to: 350 hydraulics posted by Bob 02 Martin on June 25, 2009 at 19:17:02:
Bob,
Actually, the control valves on your 350 were not designed for positive shut-off, and no amount of fooling around with their O-rings, etc. is going to change that.
IH had a "cross-check" valve which was included as standard equipment with the fast-hitch option on these tractors to keep the hitch from bleeding down. This is a rectangular block which bolts directly onto the control valve block -- you may have one already on your tractor assuming it has the fast hitch. When working properly, these are extremely effective and will hold just about any load, regardless of how heavy, indefinitely. But they only work in one direction. You could add one of these to your remote port to keep your mower cylinder from bleeding down. You might be able to get one from JP Tractor or some other salvage yard. If you have a Parts Manual (TC-57A) for the 300/350 Utility tractors, the check valve is detailed on page 315, and shown as part of the fast-hitch system on page 294.
Another option, which is what I use for my remote since it works in both directions (for a double-acting cylinder), is to install a hand valve in one of the hydraulic lines. Use the control valve to get your mower cylinder where you want it, then close the hand valve. Obviously you have to use a valve rated for the hydraulic pressure. A quarter-turn ball valve works well for this.
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