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Re: Is there a hyd valve for UP,HOLD,FLOAT, and DOWN?
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Posted by Dan from PA on April 07, 2000 at 13:37:58 from (151.201.98.211):
In Reply to: Is there a hyd valve for UP,HOLD,FLOAT, and DOWN? posted by Greg Reuter on April 06, 2000 at 20:45:57:
4-way valves with a float position are way you need and are quite common. However, if you do anything else with this 3-pt (like plowing) you may want to reconsider. Float on a single-acting cyl is almost like a down-stop. The hitch can be raised by floating action, but cannot go lower than where you had it set. Double-acting cyl float goes wherever it wants to, so if you're using something that tends to dig itself in (like most moldboard plows) you cannot run it in float position. Also, I doubt your current system has draft control, but if it does, I wouldn't know how to use it with a double-acting system. Keep in mind you also need to have a double-acting cylinder(s). Unless you have a double-acting cyl that has been converted to single-acting (there will be a breather on the other port) you'll have to spring for a new one. Check your valve, too. I've seen 4-way valves running single acting cyl's by plugging the other cyl port. You might be able to use the one you have.
I would consider a float position optional. If the bucket is all you use this 3-pt for, it's pretty easy to jockey the cyl in/out to get a bucketful. You'll want the float, though, if you use a angle blade, box blade, etc.
Call for a Surplus Center catalog (800-488-3407). They have scads of hydraulic/pneumatic/electrical stuff and lots of other stuff for the backyard mechanical engineer.
On the load checks issue I'm not sure. They could be to keep the load from moving during control changes (up to neutral to down) or just to keep the load from sagging in neutral.
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