Power beyond issues

[2011laramie]

I recently picked up a used 3pt hitch tree spade. I got a 2014 kubota L4600 that I want to use with it.

I don't have any rear remotes so I tried to bring power to the back by taking it off the power beyond port on the loader and run it to the back. Them the return back to the block under the floor board. Kinda like what they do for the backhoe setup.

Tonight was my 1st attempt at using it. The spade has an open center hydraulic valve setup. The tree spade works just fine, but the problem was the 3pt hitch won't lift the spade up. Not even when it's empty.

I had to swap hoses back to factory to get the spade lifted up.

Did I mess up with too small of hoses? The loader runs on 3/8 hoses so that's what I got made to run to the back. Or am I missing something.

 

[Ken45101]

I think that too small hoses would only slow down the movement, not stop it entirely. I assume the tree spade only uses hydraulic cylinders, not hydraulic motors.

t seems to me you have an unplanned blockage or improper hookup.

Good luck.

 

[ptsg]

The reason the 3 pt didn't work, is because you'll need to bring a power beyond line from the spade valve back to the tractor in order to feed the 3 pt valve.

What you did first was connecting the return line from the spade to the return port at the hydraulic block ( under the floor). So the fluid was going back to tank/transmission housing.

Next, you swapped hoses, so the return from the spade is now going to power beyond port at the hydraulic block. This made the 3 pt work but you're using the tank port of the spade valve to feed it which is a no no. Keep in mind, that with the backhoe setup, the 3 pt is irrelevant so it doesn't really need to work, that's why you can't exactly use the same connections for this purpose.

You'll need a power beyond sleeve for the spade valve, then a line from this sleeve back to the tractor to feed the 3 pt. The current Tank line goes back to the tank port at the tractor.

 

[seville009]

When it didn’t work with the new hoses, did the enine lug at all, or the pump sound like it was trying to work?

Could probably test the new hoses for blockage by just running water through them

 

[2011laramie]

I should clarify the 3pt hitch was functioning a little. It lifted the spade a couple inches, but not enough to get the diggers out of the hole.

As for the hoses, they are definitely clear as the spade works good.

The routing of the hoses factory go from the PB port off the loader handle to the block under the floor. All I did was put the spade in series of the PB line.

The tractor idled and ran fine. No lugging, no squealing of the hydraulic relief valve off the pump..

 

[rScotty]

I recently picked up a used 3pt hitch tree spade. I got a 2014 kubota L4600 that I want to use with it.

I don't have any rear remotes so I tried to bring power to the back by taking it off the power beyond port on the loader and run it to the back. Them the return back to the block under the floor board. Kinda like what they do for the backhoe setup.

Tonight was my 1st attempt at using it. The spade has an open center hydraulic valve setup. The tree spade works just fine, but the problem was the 3pt hitch won't lift the spade up. Not even when it's empty.

I had to swap hoses back to factory to get the spade lifted up.

Did I mess up with too small of hoses? The loader runs on 3/8 hoses so that's what I got made to run to the back. Or am I missing something.

It sounds like it can be made to work. When the pressure hose is too small it will just slow down the operation but it will still work. Good practice when you have to run any distance is to make the return (tank) line a larger size than the pressure line. Also, if the new return joins with any old return line any distance from the sump, you want to join the two lines with a Y rather than a T. All this is best practise to reduce back pressure in the return line so your control valves will work smoothly.

I don't know that system, but most open center systems are similar. Without a diagram of how the original is hooked up we are guessing, but we can do that. The basic unknowns are the two PB ports on both control valves and their sleeving.

An unused PB port has a sleeve inside that re-routes the flow inside the valve so the PB port can be blocked off. When the PB port on a control valve is put into use, a different different internal sleeve is put into the port so that flow beyond is allowed. My best guess is that you are going to need the proper power beyond sleeve for the PB ports on your control valves.

To aid in guessing, was the power beyond port on the loader control valve was blocked off or was it going somewhere? and if so, where? And the same info for the control valve on the 3pt tree spade.

rScotty

 

[rScotty]

I should clarify the 3pt hitch was functioning a little. It lifted the spade a couple inches, but not enough to get the diggers out of the hole.

As for the hoses, they are definitely clear as the spade works good.

The routing of the hoses factory go from the PB port off the loader handle to the block under the floor. All I did was put the spade in series of the PB line.

The tractor idled and ran fine. No lugging, no squealing of the hydraulic relief valve off the pump..

Putting the spade in series with the tractor's PB line requires that the spade's control valve also has a PB port with the proper sleeve. If the spade PB line was in use before it should have the right sleeve.

Both control valves also require a return line back to the sump.
rScotty

 

[2011laramie]

The original setup goes from point 2 down to point 3.

So all I did was make 2 new hoses
Supply hose runs from point 2 to point 6.
Then the return from 5 to 4.

 

[2011laramie]

The beyond port is capped, but not with the CC cap so it's an open center setup. The 2nd set of controls is for the down pressure kit which pushes on the 3 pt hitch arms.

 

[2011laramie]

Model RD5300 25 Gallon Three Spool

Model RD5300 25 Gallon Three Spool directional control valve

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