Simple hydraulic question (I think)

J_J · Jul 14, 2013

What is going to drive your variable speed pump and how many GPM do you need?

Tx Jim · Jul 14, 2013

TSL said:
I had another thought last night: A closed center circuit powered by a 12 volt DC pump which would run only when one of the electric valves has been activated. Any thoughts?

I've had a PU flat bed for over 13 yrs with an incorporated rd bale spikes for moving rd bales that utilizes an electric over hyd system as you refer and the systems are dependable. But with tractor hyd's available I'd use the tractor hyd system myself. IMHO to operate the raising/lowering simultaneously of the blade with 2 cylinders is going to require some expensive valves for both ends of blade to stay level but then I've been proved wrong before.

bulldogshotgun · Jul 14, 2013

while there are options for for splitting flow, flow dividing valves, rotary flow dividers, etc. i don't think you would need them. Unless you are using extremly large diameter cylinders, they are going to react pretty quickly, and yes one side will probably move before the other but not enough to destroy your grade. thats just my opinion though.

TomSeller · Jul 14, 2013

With splitting the flow equally isn't this just going to result in each cylinder moving half as fast as the open center series connection? In that configuration you are using the entire pump capacity on one cylinder, should be twice as fast. Or are the cylinders going to be activated when the grader is in motion, ie wanting them to move at the same time?

TSL · Sep 2, 2013

QUICK FOLLOWUP:

First, let me say thanks to everyone for all of the assistance on this project. The advice from J_J was particularly helpful, in fact I couldn't have done it without him. Anyway, the project is finally finished and works just as it should. I ended up using the tractor hydraulic system by installing the auxiliary hydraulic unit supplied by John Deere. I used the divider valve (suggested by JJ) to supply two electric open center valves which control the lift cylinders. The T output from one of these valves then supplied two manual valves which control the angle and sides shift cylinders. I will try to attach pictures, but I'm not sure I know how. Thanks again. Larry

J_J · Sep 2, 2013

I just saw your pictures. Looks good.

Let me recommend that you replace those water pipe fittings with hyd steel fittings as soon as possible.

Those fittings were never intended to be used as hyd fittings.

TSL · Sep 2, 2013

Hi JJ:

I will do whatever you tell me to do. Why is it that these fittings won't work for hydraulics?
Larry

J_J · Sep 2, 2013

They are not pressure rated for pressure used in hyd, upwards of 3000 psi with tractor hyd.

This could happen at any time.

http://www.tmcinc.org/CATALOG PDFS/N_STEEL PIPE FITTINGS-WEB.pdf

http://www.engineeringtoolbox.com/cast-iron-flanged-pipe-fittings-pressures-d_642.html

k0ua · Sep 2, 2013

That is just pretty darn scary.

Simple hydraulic question (I think)

J_J

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Tx Jim

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bulldogshotgun

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TomSeller

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TSL

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