L**40 rear hydaulic pressure

[J_J]

Althogh I have never seen the intinsification work, I do believe it will work.

If as you say that the rod end fluid from the FEL is routed to the PB port, then with the remotes in neutral the fluid would just flow through every valve in line and to tank. When you let the loader down, the fluid from the rod end would flow out the PB port , to the input of the remote, and if you operated the spool that the gage is plugged in, you could perhaps get pressure intensification's, as long as the lift cyl's were were descending.

If the only spool that you operate, is the one with the gage, do you get the 3200 psi? If so, it has to be pump generated, but where is the relief set and why is it not regulating/relieving the pressure.

However, when you lower the loader, you might not use high pressure on the base end of the lift cyl.

What would happen if you raised a 1000 lb load and shut the engine off, and then with the gage plugged in at the remote, and caused the lift cyl to descend and operated the remote valve at the same time.

Would the loader stop descending when you operated the remote spool?

If the flow from the lift cyl does exit out the PB port, then you should see the pressure caused by the load on the FEL, whatever it is and this pressure would be caused by the load and pressure on the rod side.

If it works like that, it would be the first valve that I know of that works that way.

According to the manual, it seems that 4Shorts 2250 psi is lower than the book psi for the remote. I believe it said something like 2600 ps ito 2700 psi.

 

[oldnslo]

wow 81 posts on what should be an easy problem to solve and still chasing it.

Kubo,
Dumb question but have you tried checking the curl pressure on your tractor?

Just curious since this should be the same as shifting your rear remote.

Roy

 

[J_J]

There is no reference in the manual that 4Shorts posted to this kind of pressure.

No nothing.

If another tractor can not reproduce the same results, is it fact or just a fluke.?


4Shorts,

Did you operate the FEL while you were operating the remote at the same time?

Kuboman,

Did you ever read the the 3pt pressure before you added the remote valve? Do you think this situation would have boosted the pressure to the 3pt?

 

[kuboman]

I will see if I can remember all the questions.

Yes I have checked the curl pressure....same as the loader.

4shorts has a cabbed model. I believe they are plumbed a little different. Until someone checks both pressures I can't be sure if it is just mine or maybe something with the non cabbed model or the older HST-1.
I did not check the pressure on the 3pt before I installed the valve but I am almost convinced it is something with the loader valve.
So many questions and so few (no) answers.:laughing:

 

[4shorts]

4Shorts,

Did you operate the FEL while you were operating the remote at the same time?

No sir. No need to. My tractor is only used for snow clearing. The only time I need the rear remotes is to rotate the chute deflection and the rotation. The snow blower will never be removed from the tractor unless it has to be serviced. I'm either using the FEL or the remotes but never at the same time.

 

[4shorts]

4shorts has a cabbed model. I believe they are plumbed a little different. Until someone checks both pressures I can't be sure if it is just mine or maybe something with the non cabbed model or the older HST-1.
:

I just went out to the shop to see if the couplers that are on my snow plow would work on the FEL hook up but there the same size as the rear remotes. The FEL are smaller and I really don't want to remove the coupler from the FEL cylinder. I may get into he city tomorrow and I'll drop in to the Bota dealership to see if I can purchase a female coupler tomorrow and test it for you.

I did notice that when I did the rear pressure test when the pressure came up to 2300 l.b.s. when I let go of the leaver the pressure started to drop back on the gauge and the pressure didn't hold at its max.

 

[J_J]

kuboman, or 4Shorts,

Can one of you post the page about the rod end flow from the cyl flowing out the PB port, and bypassing the relief?

What I am not sure of is, that when the pump is pumping say 10 GPM's, and the cyl is maxed out, there is no fluid from the rod side of the cyl, and the hyd flow is being relieved. Question is , where is the fluid going that is not passing over the relief valve. It should be going out of the FEL valve, via the PB port. The relief fluid should be going to the OUT port to the return hose.

Since the FEL valve is regulating the pressure, the 2550 should be flowing to the #pt according to the manual. I am also not sure of the routing of the fluid, but I suspect is going through a hyd block.

With no remotes, I believe the system works as I stated above.

Now if you add a remote, you remove the hyd cover plate and add adapter plate with the ports for the remote, and after adding the remote valve, which intercepts the fluid from the FEL PB, the flow is now flowing through the remote valve and then to the 3pt.

 

[oldnslo]

kuboman, or 4Shorts,

Can one of you post the page about the rod end flow from the cyl going to the PB port, and bypassing the relief?

JJ,
look closely at the loader valve schematic which was 0012 I think. The schematic shows the return oil from spool #2 being directed into the PB port. It should never see the system relief. What Kubo is seeing is not intensification since the FEL is disconnected.

Kubo,
is there any way to disconnect the PB line from the FEL valve and direct it into the sump in a manner where you can watch for flow? Also run a line from the rear valve to the sump or a bucket. Start the tractor, is there flow out of the rear valve? If yes then we need to identify where it is coming from.

Is there flow out the PB port on the FEL valve? If yes,shift the curl function, IF the FEL valve is drilled/plumbed/ported correctly there should be no flow in this line with the curl spool shifted. If there is flow out this line that would indicate something in the FEL block is not assembled correctly.

With the loader disconnected so it can't move try shifting the spool and see if you get flow out the PB port. If yes same as above.

If you get flow out the PB port when going over Relief, does it look like the volume of flow changes? Does the oil look aerated like it is going over relief.

Roy

 

[J_J]

Roy,

If he were only using 5 GPM to curl the cyl, how much flow from the 10 GPM pump would flow out the PB port? The remote should see 5 GPM at the IN port to the remote valve while operating the curl, and when the curl is done, the flow to and through the remote returns to the 10 GPM flow .

Before he added the remote, the flow from the FEL PB was going to the 3pt.

I would also be curios if he removed the remote valve and replaced the cover plate, would he have the 3200 psi at the 3pt.

 

[oldnslo]

Roy,

If he were only using 5 GPM to curl the cyl, how much flow from the 10 GPM pump would flow out the PB port? The remote should see 5 GPM at the IN port to the remote valve while operating the curl, and when the curl is done, the flow to and through the remote returns to the 10 GPM flow .

yes if the operator is feathering the DCV for curl so he is only using 5 GPM the remaining 5 would go out the PB port.

Before he added the remote, the flow from the FEL PB was going to the 3pt.

I would also be curious if he removed the remote valve and replaced the cover plate, would he have the 3200 psi at the 3pt.

On his 3PH I don't think he would ever see system pressure unless he was lifting a load heavier that the tractor could lift. This model has draft control and other features that prevent the flow from being blocked unlike my little BX.