Hydraulics: Help Me Think

Due to space restrictions, it is looking more and more like I'm gonna have to get rid of the rotary valve on my loader in leau of a three-spool valve set up.

Okay, two of the loader functions use one-way cylinders.

How do I hook these one-way cylinders up to one of these open-center valve setups that they sell nowadays?

Do I hook the port on the valve (where you would normally plumb the opposite throw on the cylinder) to just dump to sump?

Would that let the cylinder bleed off thru the valve to sump and lower? Or, would that pump pressure to sump?

Hope I'm making myself clear.

Thanks,

Allan

Bout halfway between you and I is Burden's Surplus center. Don't know if you have a catalog They may have something on the shelf to handle your application. Otherwise you can assemble your own stack valve. This prince stack valve setup I have linked will allow you to make up what you need. I have one on my forklift, One way on mast and two way on tilt.

hth

jt

• Burdens Surplus Center

I was glad to see you have at least been considering keeping the valves and hoses out of the cab for safety's sake.

Just think if the hose from the pump broke after you'd been using the loader for a while, and the oil was HOT, or if the hose to the lift cylinders broke with a load of bales up in the air, and ALL that oil sprayed on you, 'til the fork was on the ground!

The other poster is right, there are control valves available with spools set up for single-acting cylinders. I believe some valves can have individual spools set up for single acting cylinders by removing a plug accessed through one of the ports, to allow an INTERNAL bypass-to-sump while in "lower the single-acting cylinder mode".

Surplus Center (www.surpluscenter.com) has experts on hand who can tell you of they have valves to meet your needs.

Is there a "Force Hydraulics" shop in your area?

Also, Baum hydraulics in Omaha (http://www.baumhydraulics.com/Baum/) (800-228-9288) has experts only a phone call away who can help you "spec out" the valve you need, as well as cables and lever or joystick setups. (I have an account with them, I'm not absolutely sure if they sell direct to the consumer, or not.)

I'm sure they would try to help you, and refer you to a local reseller, if necessary.

About the 12-GPM pump... remember, that's at WOT, and, unless you are roaring around, doing all your loader work at WOT, you're going to have considerably less than the 12 GPM MAX flow available.

Gerald J.

I've been looking at this thing all day trying to figure out different ways to do it.

I just wanna get this job done and forgot about. :>)

Allan

I think you can get a a so called 3 way valve. This is specially designed to work on single acting cylinders. Plumb one line form the valve to the base of the cylinder. One thing to think about, when you buy a valve, make sure it has a large enough flow rating to handle the GPM that PTO pump puts out. If you want it real slick, get a valve that uses a joystick. This frees up a lot of room in the cab.

My two cents.

John

But doesn't the joystick arrangement use cables and/or electric solenoids?

I want no part of those two scenarios, as they are nothin’ but trouble and always on the coldest days, from what I’m told by the big dogs.

Allan

We've had a joystick on our JD loader just like WyoDave posted for ten plus years, tractor is almost 20 years old. So far I had to replace one cable. Never had it freeze up. It helps to keep the one end in the cab where it is warm and out of the elements.
After you get used to the joystick(about 1 hour) you will wonder why every loader doesn't have one.

John

Who sells these things?

Allan

The ones on the SGB tractors are from Mother Deere. Any good wrecker should have something. Good hydraulic supply houses should also have. There are kits out there to connect manufacturers joysticks to various valves. A quick google search should turn up some info. Unfortunately you may be in for sticker shock if you buy new.

John

Do I just leave a plug in the "other" side and the valve will internally bleed off to the non-pressure side of the valve?

Allan

Originally, the oil drained right back thru that same hose and was routed to sump thru the valve.

Allan