Re: Hydraulics: Question 2

Posted by Gerald J. on October 31, 2006 at 18:20:47 from (67.0.103.54):

In Reply to: Hydraulics: Question 2 posted by Allan In NE on October 31, 2006 at 16:39:44:

Depends on the bore of the cylinders and their stroke. I've found on my loader with 2.5" cylinders that 5 gpm is plenty fast. I know JD specifications for setting the flow on the older 4020 valves sets to 5 gpm so that a 3 x 8 cylinder takes 5 seconds for a stroke. Making that cylinder stroke much faster means the ends get bumped hard because the operator can't respond fast enough. And after enough hard bumps the ends fall off they cylinder. I replumbed my loader once with a 5 gpm pump and it was plenty fast, most of the time I kept the engine (crankshaft driven pump) slowed down to keep the loader more under control. When I mounted that loader on my 4020, I included a micrometer flow control valve in the pressure line to do that flow restriction from where I'd tapped the main pressure line.

So you can figure the flow you need based on the bore diameter and stroke of the cyinder and how fast you want that stroke to be, allowing a second or two for your reaction time at the end of the stroke. Too fast a stroke lifts the tractor off the ground shoving the loader around.

Gerald J.

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