Loader Valve / Curl function diagnosis

[J_J]

A regen spool has an extra land cut into the spool to allow the rod end fluid to transfer to the base end of cyl and the spool also blocks the flow to tank.

So no pressure on work port when in regen.

Move the lever further to the right and you should have flow and pressure if connect to a cyl.

When the spool is moved, fluid is going somewhere.

If you have no flow in the power dump, then you do have problems.

There are three places for the fluid to flow internally, through the valve, to the cyl, or through the relief valve.

Purpose of the spool is to shift the flow to certain parts of the valve.

If you have no flow out of the work port and no pressure, then the flow is moving through the valve going downstream.

Curl up should have flow and pressure.

 

[LD1]

So no pressure on work port when in regen.

Pressure on BOTH work ports is what makes regen.

tank is blocked, work ports are connected and applied pressure.

Since both have pressure, and tank is blocked, you only have to make up the amount of fluid the rod occupies. Not the whole diameter of the cylinder. So a 2" cylinder with a 1" rod will move as fast as a 1" cylinder. But also be as weak as a 1" cylinder. Its displacement principal. Thats wh regen wont work in retract.

 

[GPintheMitten]

On my kubota, first position to the right is regen, second is power.

maybe I missed it, but you did not say which direction dont have pressure? dump or curl?

Are you 100% sure you are on the right hoses?

In regen mode, BOTH ports should see pressure. In power mode, only the hose going to the base end of the cylinder will have pressure. In curl, only the rod end hose will have pressure.

What is the PSI range of the gauges? If you are using 0-3000 or 0-5000 gauges, its possible that an empty bucket just dont have enough weight/resistance to notice a pressure reading. Try ditching the hoses and hook the gauges straight to the valve?

Any pictures of how you are testing it now?

Both gauges are attached directly to the curl ports. They are 2000 psi guages. I'm expecting that when I move the joystick the Guage should max out and fluid go through the relief (that is, if the valve was functioning correctly ).

But when i move the joy stick to the left, there is 0 pressure on the Guage for that port.

 

[J_J]

Pushing the lever to the right should be dump slow or fast.

Push lever to left is curl up.

Is your valve in the correct orientation.

 

[GPintheMitten]

Pushing the lever to the right should be dump slow or fast.

Push lever to left is curl up

Right now there are no hoses on the curl ports, just a Guage on each one.

When engauged, one reads 0 pressure, so doesn't that prove that I need a new loader control valve?

 

[J_J]

Not in the case where he has gauges in the ports, because there is no flow.

I have already ask him to see if there is fluid flow at full lever. No answer yet.

The gauge should be in the valve IN port, and cyl connected..

The only thing he is doing is to make the fluid flow over the relief valve.

 

[GPintheMitten]

Not in the case where he has gauges in the ports, because there is no flow.

I have already ask him to see if there is fluid flow at full lever. No answer yet.

The gauge should be in the valve IN port, and cyl connected..

I didn't want to dump oil on the ground.

I'll go out in a few minutes and take the guages off and see where there is flow.

 

[J_J]

Put the hoses in a bucket and work both levers to the max for a few seconds.

 

[GPintheMitten]

There are hard lines at each.port with banjo fittings. I can't put a Guage in series and still have flow without some major plumbing.

 

[GPintheMitten]

Put the hoses in a bucket and work both levers to the max for a few seconds.

Ok. I'll try that and report back.