Single remote with float for top link

aarolar · Jan 1, 2017

So LD1s thread has motivated me and I'm interested in setting up something similar to what he has done but with a single valve for a hydraulic top link. I have virtually the exact same tractor as he does and I am wanting some help picking the correct valve, I looked briefly but there are so many different styles I have trouble making an informed decision. The biggest thing I require is a float for mowing and working a harrow but also the adjustability would be fantastic for pulling a subsoiler or my root rake. My MX4800 has a 9.5gpm flow.

aarolar · Jan 1, 2017

Kinda looks like this here may be the ticket.

Shopping

#220125 at bailey's incase the link doesn't work.

LD1 · Jan 1, 2017

Certainly looks like that valve would work.

Like I said, in a single spool you have slot more options.

Something 10-15 GPM is about perfect. Not too big and not too small. The 1/2" work ports are perfect size.

Basically you need to make sure the following...
4-way valve with 4th position float......Check
10-15 GPM.,......,................. Check
Power beyond............ Check
Tandem center............Check.

That's the short list. There are dozens of valves that fit that. Pick your price and brand of preference. Don't forget the PB cartridge which is usually sold separately with whatever you choose

aarolar · Jan 1, 2017

OK good now I still need some help with the plumbing I've been studying this for hours and I'm still not sure about it. I understand a open center system but I'm still fuzzy on how the PB works differently.

aarolar · Jan 1, 2017

Doing some more research I see prince has a product configurator where I can select all the options I want on that valve then it spits out a number I can give to a dealer to get a custom valve to my specs.

aarolar · Jan 1, 2017

OK more reading I think I understand it finally see if I'm there.

The PB from the loader will feed the inlet on the remote, then the outlet on the remote valve goes to the tank and the PB on the remote goes back to the 3pt.

LD1 · Jan 1, 2017

^^^^^ you got it.

Our tractors are what they call open center systems. That means it's a positive displacement pump. So it's always trying to pump fluid weather or not you are using it.

The valves are open center, so that when not in use, the oil just passes freely through and on to the next valve. So it's a series setup. Cannot use Tee's. Because the fluid will take the path of least resistance.

Well, the tank port of valves isn't designed for pressure. Thus the use of a power beyond. So think of the series of valves, being pressure port is inlet and PB port is outlet that goes to next valves inlet.

The tank port is still used, but only for return flow when using the cylinder working ports.

The tank line can be tee'd in.

As our tractors are set up, pump pressure feeds loader inlet, PB from there goes to 3ph. You are simply inserting the valve between the two. So PB from loader will feed new valve, PB from new valve will feed 3ph. And tank port of new valve can tee'd back to loader tank line.

Tank lines are the only thing that can be tee'd together.

aarolar · Jan 2, 2017

LD1 said:
^^^^^ you got it.

Our tractors are what they call open center systems. That means it's a positive displacement pump. So it's always trying to pump fluid weather or not you are using it.

The valves are open center, so that when not in use, the oil just passes freely through and on to the next valve. So it's a series setup. Cannot use Tee's. Because the fluid will take the path of least resistance.

Well, the tank port of valves isn't designed for pressure. Thus the use of a power beyond. So think of the series of valves, being pressure port is inlet and PB port is outlet that goes to next valves inlet.

The tank port is still used, but only for return flow when using the cylinder working ports.

The tank line can be tee'd in.

As our tractors are set up, pump pressure feeds loader inlet, PB from there goes to 3ph. You are simply inserting the valve between the two. So PB from loader will feed new valve, PB from new valve will feed 3ph. And tank port of new valve can tee'd back to loader tank line.

Tank lines are the only thing that can be tee'd together.

Amazing how any hours it took before that finally clicked in my head so simple once I figured it out.

LD1 · Jan 2, 2017

Yep, understanding is powerful.

In many ways, a closed center system with a variable displacement pump, like some older deere's, are simpler systems for modification. Because can simply be tee'd anywhere for pressure. But adds complexity and cost to the pump with unloader valves and all.

aarolar · Jan 2, 2017

Now help me with this that valve I have chosen, where is the float on it is it in the center float all the time or does it detent at one extreme for the float? If it floats in the middle that would mean I could never hold a fixed position when I wanted.