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Need help with hydraulics terms

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Flat47

11-16-2007 14:54:59




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Can someone please tell me what "spool" and "float" refer to when talking about loader controls?

Thanks!




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Flat47

11-17-2007 08:26:35




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 Re: Need help with hydraulics terms in reply to Dick L, 11-16-2007 14:54:59  
Thanks for the input!
So on my Freeman-made (A-C badged, and previous owner reworked to full hydro) loader, the loader up/down control feels like a 3 position lever. Pull back for down, push half-way forward for up, and full forward for possibly float. I haven't tried float, but I do know that pushing the control lever full-forward brings the loader down free fall. It wakes you up in a hurry.

Does this seem right?

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Gene S in IA

11-22-2007 09:20:44




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 Re: Need help with hydraulics terms in reply to Flat47, 11-17-2007 08:26:35  
I think your valve should be connected so toward you is up, middle is down presure and all the way forward is float. Thats how my loader is.



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135 Fan

11-17-2007 10:31:04




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 Re: Need help with hydraulics terms in reply to Flat47, 11-17-2007 08:26:35  
Float is used for levelling in reverse. Never use float when going forward. Bulldozers and skid steers have float as well and that's what it's for. Dave



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Midwest redneck

11-16-2007 16:35:32




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 Re: Need help with hydraulics terms in reply to Flat47, 11-16-2007 14:54:59  
A spool is a machined steel rod with oil grooves, this spool slides with usually .0005" radial clearance between the valve body. As the spool is moved to another position hydraulic oil is diverted to another port, like A to B or B to A, from the pressure port. A float position is where the valve has an open center and the weight of an implement like a blade will just ride along the ground with no hydraulic downpressure.

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lzybull

11-16-2007 15:33:15




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 Re: Need help with hydraulics terms in reply to Flat47, 11-16-2007 14:54:59  
some folks call the hydro valve a spool. it"s a type of valve. the settings on a lot of loader valves have raise,hold,lower (down pressure)then float. float is where the bucket or blade will follow the contour of the ground, it will drop in a gully and go over a ridge as you move along the ground. where as if you use down pressure it will level the ground to some degree.hth, glenn fuller



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