is this a power beyond valve?

[Chrisb62]

Also something else.
There's no hydraulic oil filter on the loader. I want to add one. Does it go on the high pressure line before the valves? Or on the return line before the reservoir? Or after the reservoir?

 

[Dave M7040]

This is what I believe the pump delivers.
15.4 gpm at 2,000 rpm.

Filter has to go where it is low pressure.

By being on suction side of pump, the pump is getting cleanest oil possible.

Filter needs to be big enough not to starve pump.
Hydraulic fluid needs to be high quality very fluid so no restriction to suction.

Dave M7040

 

[Chrisb62]

Wow that's great. Thanks a lot.

I'm thinking for the price and ease. I'm gonna consider the selector valve. I've gotta replace that hose anyway. So i might as well put this in line and give it a shot. I'll just have to get a tee fitting for the return to the reservoir i suppose.

 

[swnoel]

Ok i see what you're saying.

I'm trying to run a 3 point hitch backhoe.

It's a Ford 3000 with a front loader. Whether it came with that loader originally i have no idea.

It has the pump on the crank. But i can't find any info about how many gpm it is or anything about the valve on there. But the loader runs great. Almost too fast. I think it would run the backhoe just fine.

Ive been considering a PTO pump but the cost is getting expensive. So i was hoping i already had a power beyond valve which would save some cash.

The backhoe has quick connectors on it already. I was hoping it would just be a matter of adding the same to the power beyond and return lines.

After looking at it again, it's possible that's a relief valve. Shut off the tractor, take off the pressure and remove the cap. You'll find out what it is. If it's power beyond you should be able to use it to power another valve.

 

[Dave M7040]

Chris
In your existing setup, the relief valve is in the FEL valve block.

With the selector valve, you need to make certain the backhoe valve has a built in relief.

You will also need to keep an eye on oil temps as the backhoe is constantly moving and will heat the small reservoir much faster than a FEL

Dave M7040

 

[ericm979]

What's a good way to add a temperature gauge to an existing hydraulic system?

 

[swnoel]

Chris
In your existing setup, the relief valve is in the FEL valve block.

With the selector valve, you need to make certain the backhoe valve has a built in relief.

You will also need to keep an eye on oil temps as the backhoe is constantly moving and will heat the small reservoir much faster than a FEL

Dave M7040

Dave, sounds like you're familiar with this valve, I'm not. If you'd be so kind I have a couple of questions for you. Chris' original question was what was that bold/ nut next to the lever? I thought it might be the adjustment for a relief or possibly a PB port. Could you explain to me what this is? If a valve has PB does it mean it has to have 7 hoses? Thanks

 

[BHD]

if you wanting to hook up a modern" back hoe, on that tractor, make sure you have enough Hydraulic pressure to operate the hoe,

a lot of tractors in the that era, only produced about 1100 psi, of hydraulic pressure,
most "modern" hydraulic systems are in the 2200 to 3000 psi range,

~~~~~~~~~~~~~~~~

and from what I can tell I think your looking at the Pressure relief valve on the valve block,

~~~~~~~~~~~~~~~~

For a temp gauge is a tee, and fitting for the temp gauge or sender,

 

[Tx Jim]

Dave, sounds like you're familiar with this valve, I'm not. If you'd be so kind I have a couple of questions for you. Chris' original question was what was that bold/ nut next to the lever? I thought it might be the adjustment for a relief or possibly a PB port. Could you explain to me what this is? If a valve has PB does it mean it has to have 7 hoses? Thanks

I'm not Dave but the valve in photo below appears to be an adjustable relief valve. Yes hyd control valve with power beyond when attached to open center system will normally have 7 hoses attached to it.

 

[Dave M7040]

Dave, sounds like you're familiar with this valve, I'm not. If you'd be so kind I have a couple of questions for you. Chris' original question was what was that bold/ nut next to the lever? I thought it might be the adjustment for a relief or possibly a PB port. Could you explain to me what this is? If a valve has PB does it mean it has to have 7 hoses? Thanks

Let me combine two answers in one post.
Chris wants to add a temp gauge.
This electrical type would be the easiest. At the tank there is a return elbow for the fluid returning to the tank.

You install a tee instead of the elbow and in the open hole on the Tee you install the temp sensor using the necessary bushings.

The "assembly" beside the two control levers is the adjustable relief valve. Most open center farm tractor type loader valves have them.

Let me explain a little further. Should you have a power beyond circuit coming from the loader valve and going to a second control valve,for a top and tilt for example, the second control valve also has a relief valve.

The FEL relief valve is set at 2,200 psi just to pick a figure. No matter what you do to the relief valve on the top and tilt control, it will never produce pressures higher than the FEL relief valve as the FEL relief is dumping any pressure above its setting. If you wanted the top and tilt relief valve set to 1,500 psi, you can do that and not affect the FEL pressures as they are first in line from the pump.

Please don't hesitate to ask any question. We all started with no knowledge at one point and it is the obligation for a few like me who have a bit more to share with others who want to learn.

Currently Chris' loader valve has a return line to the tank or reservoir. This is necessary for several reasons but a critical one is to provide a place for the relief valve to get rid of excess pressure.

On his normal loader valve there is a high pressure supply from the hydraulic pump. there are 4 work lines going to the double acting lift arm and bucket cylinders.

One high pressure supply line
One tank or return line
Four work lines

Total of six

Six is the basic number of lines a double spool FEL valve must have.

If there is a seventh line, that tells me that it is a power beyond line because it is above the number for simple FEL operation.

Sometimes you find uneducated people using the tank port to feed another hydraulic circuit. They cannot see why a line, which has fluid flowing in it, cannot be a pressure line for another valve.

There are design reasons too complicated to go into why this is a bad practice but the specification of most valves shows a simple reason not to do it.

The green arrow shows the design working pressure of the valve. The red arrow shows the much smaller design pressure of the tank port.

The only reason it is even 500 psi is in case you are using the tank port to supply a return line filter which creates some restriction in the flow of oil going back to the tank or reservoir.


This is an example of where a power beyond plug or sleeve would go.

This next fancy sketch is the type of Google search find that seriously misleads owners. It is using the out or tank port of the first valve to feed the second valve.

It is both wrong and dangerous.

Another WRONG example this time from youtube.

Power beyond is also called High Pressure Carry Over HPCO which is a better term to describe what is happening.

More questions, just ask. i never give short answers

Dave M7040