Some questions for you guys who know about hydraulics

[thenrie]

I'm wanting to "accessorize" my 1650 as I rebuild it. I plan to add front and rear hydraulic ports and a Cat 0 three-point. The 1650 will be my main workhorse around the place, which will include snow removal, tiller work, grading driveways, mowing, hauling, etc. I'm wanting to be able to operate the front and rear ports separately from the deck/3-point (not exactly sure why yet, just seems like it would be handy), so I'm thinking about installing a three-spool hydraulic valve and fabricating the operating handles. Anyway that's the thought.

Questions:
1) Can hydraulic lines be "T'd" and run off one spool, so as to use either the front or rear ports (ie one spool for the deck lift/three-point and one for the front and rear ports) if I should decide to go with the Cub two-spool valve?
2) What should I look for in a spool valve? I have been seeing good prices on ebay for triple spool valves from JD garden tractors, so that's what I have been looking at. Besides, I figured they'd be comparable with the Cub valves, specification-wise.
3) What does open or closed center mean? What does "directional" mean?
4) Are spool valves easily rebuildable? What should I watch out for as signs of a "no-go" used valve?
4) I know the Cub pumps push about 750psi or so, at about 3-5 gpm, right? Would a valve spec'd for, say, 2000psi and 8gpm still work?

Now on to the 682.
I plan to make the 682 my bucket/backhoe tractor. I plan to build using the PF engineering plans...just because it looks like a fun, as well as useful, project. What should I look for in pump and valve specs for the implements to have good speed and power?

Last question: What use has the rear shaft on the Cub hydro pumps? Did IH ever intend for anything to be run off the rear shaft? I guess it wouldn't work as a rear PTO or folks would be doing it.

[riesedesperado6170]

yes you can t off you spool but it will run both front and rear ports at same time for instends if you have a blade on the front with power angle and put a dump on the back when you ran the lever blade would angle and dump go up and down at the same time but if you only have one a front or back attachment hook up at a time your ok hope that makes sense. the JD ones are very much the same just question of room and puting another lever in save on t off they also on there vales have a float so you don't have to remove pin to have float which is very nice. opens and closed center means when you have a close center oil don't circulate back to tank unit you open a valave if it open oil circulate all time that what cub ones are. yes that valave spec still work the spec. are max. number. the pf design has what pump and valaves you need he give parts numbers from diffent suppliers i found a valave pack for the hoe part that nice it comes up a better price then buy the ones he has but i have to find the number and which supplier it is i pm with it. let me warn you hydraulic are cheap and can drive you nuts. know for your last question it run rear pto if you have it. Hope this all makes sense and i answer every thing any questins pm me i do my best to help if i don't know i can call my buddy he been working on hydraulic for 20+ years

[thenrie]

Thanks! That pretty much covered my questions, but presented a couple new ones.

What do you mean by "float"? Is that where a lift is free to move up and down, like when you sit the bucket on the ground. I seem to recall that my dad's Kubota B6100 had a little lever or something on the valve that controlled float, but I can't recall what it was or did. His also had detents on the up/down control that held the pressure on when needed, like so I could tilt and lift the bucket with one hand.

What is the benefit and purpose/use of closed or open center spool valves?

I think I'm going to pick up one of those JD valves. Iv'e seen them go for as little as $40+sh on ebay. I can make/run my own steel lines if room is an issue in the 1650. Building a decent handle shouldn't be a problem either. The Cub handles are pretty simple.

[ol'George]

Open center means that the oil is always pumping through the system, most older systems are like that and work well as well as a lot of modern systems.
You can think of it as a bypass system, if oil is not put to work pushing a cylinder, it is bypassed to the resevoir
Closed center is a more complex system and requires a relief valve when the equipment is started.
It runs under pressure and is diverted to various tasks to perform work.

A float is just that.
simply put:
A spool valve has a center position, as in nothing actuating but holding both sides closed , and an extend position and retract position. (if it were plumbed to a cyl.)
Some spools have a 3rd position beyond say a down position, where the lever clicks into a detent and stays there.
it opens both sides of the cylinder to the resevior tank allowing the cylinder to "float" as in a front bucket that will move up/down in relation to the ground is is encountering, if you were strong enough you could move the bucket up/down without hydraulic resistance.
Clear as mud?

[thenrie]

That's perfect. That's what I needed to know. I think I have enough to start shopping around now. Thanks to both of you.

[thenrie]

riesedesperado, I appreciate your help, but I can't make heads or tails of your messages. I figure you must be sending them from a phone. Might I suggest you read your post before submitting? It is apparent that you know what you're talking about, but I can't decipher much from your messages.

Thanks for your effort, though.

One last question: What does "directional" indicate? Does that just mean I would get up and down pressure?

What I would like is a three-spool valve that would handle a front blade, a deck and rear three-point lift, and a rear implement, such as a dump trailer. I figure I need a valve that is 3-spool, open-center, and directional, yes?

I got that PF Engineering plans for the bucket and backhoe include specs for the valves needed, so all I am shopping around for now is a valve for my 1650.

Tony

[themaddhatter]

Thenrie,

Did you make any cool implements yet for your 1650?