L2350 Kubota Loader Valve Replacement

[gwabud]

I'm trying to replace the original loader valve on the L2350 with the "Brand" (Brand is Manufacturer name) valve available from Motion Industries. The configuration will work with the float in the right position etc. etc.. But I'm confused on the hose configuration. The Kubota valve (which seemingly can't even be identified by the manufacturer) has PB (Power Beyond) that goes to a hand operated single spool 4 in 1 bucket control. Here's the problem;

There are 3 hoses and connections I'm concerned with:

1. The old kubota valve "In" hose (right side of valve) is connected to the 4 in 1 valve "Out".. (4 in 1 is power beyond)

QUESTION 1! -- Is this "IN" portion of kubota loader valve the power beyond port?

2. The "Out" hose of the old kubota ( left side) valve goes under the REAR of the seat of the tractor which I think is a return line to tank. (transmission.)
This hose is a smaller diameter than the other hoses.

3. There's an additional hose coming from kubota valve that's situated over the top of what appears to be the "Out" side (left side) of the valve. But this fitting is a little off set from the other "Out" hose of valve. This hose goes under the seat also except under the FRONT of the seat. Underneath the front seat is a little valve that controls the speed of descent for the 3-point hitch. It also looks like a little junction block of some sort. These hoses are connected to what appears to be the same little junction block although I know they have to be unconnected some how inside there.

4. The "IN" line from the 4 in 1 valve also goes underneath the FRONT of seat and connects to this block also. So there's two hoses connecting under the FRONT of the seat. One is above the other.

Are these two hoses a feed and return? If so, what's the hose underneath the rear of the seat. In other words, there's three hoses under the seat. Two under it in the front and one under it in the back. And they are connected as stated above.

The new valve has the same sort of terminology but the PB is coming from the OUTLET portion of the valve, not the "IN" like the old kubota configuration.

Can anyone simplify how these three hoses should be connected to the new valve?

The new valve has an "IN" and "OUT" like the old valve. But it looks like they can't be hooked up the same.

There's 4 hoses! How complicated can it possibly get?

Could really use the help!

 

[J_J]

No, the IN port is just that, pressure IN.

PB goes to the 3pt. It might go through the hyd block.

OUT/return goes to tank.

work port go to cyl

 

[gwabud]

No, the IN port is just that, pressure IN.

PB goes to the 3pt. It might go through the hyd block.

OUT/return goes to tank.

work port go to cyl

Thanks so much for info... But I'm still confused. The pressure IN on 4 in 1 valve hose comes from under the seat. The pressure OUT from 4 in 1 goes to the loader valve IN fitting. So if that's what's going on there, they're sending pressure to 4 in 1 valve 1st, then through for in 1 valve to loader valve. Is that right?

Then the out line from loader valve is going behind the seat. This must be the return to tank line correct?

I didn't think you would send pressure to the PB first and then to the loader valve, but I guess this is what's happening. Is it right?

 

[J_J]

You could call the pump flow through the hyd block PB as it can handle the pressure and feeds other valves downstream.

Different tractors do it differently, On some tractors, the pump directly feeds the loader valve.

On others, the pump fluid goes to a hyd block and then to the loader valve, and then the PB out from the loader valve will feed back to the hyd block.

On some hyd blocks, you have to replace the blank cover plate with an adapter plate that will feed the fluid to the remote or 3pt.

If you have a 4 in 1 bucket, that just uses another spool for the operation.

As long as all the valves are in series, you should have flow. The first valve to get the fluid has priority.

This is a pic of a Kubotahyd block.

 

[gwabud]

You could call the pump flow through the hyd block PB as it can handle the pressure and feeds other valves downstream.

Different tractors do it differently, On some tractors, the pump directly feeds the loader valve.

On others, the pump fluid goes to a hyd block and then to the loader valve, and then the PB out from the loader valve will feed back to the hyd block.

On some hyd blocks, you have to replace the blank cover plate with an adapter plate that will feed the fluid to the remote or 3pt.

If you have a 4 in 1 bucket, that just uses another spool for the operation.

As long as all the valves are in series, you should have flow. The first valve to get the fluid has priority.

This is a pic of a Kubotahyd block.

I can't thank you enough for the excellent information. Of all the posts I see, you seem to have a good grasp of hydraulic flow etc.. I guess you know it's almost impossible to get any useful info from locals, dealers, hydraulic shops etc.. They all seem to be like robots repeating the same worthless info:

I can't identify the valve;

Just buy a new one;

I don't know;

Maybe you need a newer tractor....

It cost's 5 times more than it should and it will be loaded on a slow boat from China.

Most people don't really have time for all of the possibilities that exist with hydraulics so they buy the new one.

For a real lack of understanding even basic hydraulic information, parts people should automatically refer any questions to the service department. Now days, the dealers just simply expect you to make thousand dollar purchases as a matter of fact. Not that any higher dollar purchases should be investigated a little. You're somewhat of a nuisance for even inquiring. In their gestures, facial expressions and general communication they don't have time for you.

So before they launch into any of their tree climbing rabbit stories, I kind of tune out the back ground noise and simply try other approaches. All in an attempt to glean even the smallest amount of info.

By reading things like this, the average reader would probably assume that I'm some kind of sore head... I own my own truck and equipment repair. I've been at it for 28 years. I have people in our own service department that I correct for that very problem. Take the time to help! Listen to what they're saying! Do what they want! It doesn't matter what you think of yourself, it's what the customer thinks that matters.

You can help anyone that comes in the door, take all the time it takes. The other people in line know when it's their turn that they'll be treated the same way. From experience, that's what they like. That's why they come back. You can still have the same customers for 30, 40, or 100 years as long as they're treated right.

Go the extra mile. You hear it all the time. I can tell you this; you'll be all alone. It's getting lonely on the extra mile!

Keep up the good work! I was pleasantly surprised by your patience and knowledge.