Lift arms wont raise

[vineman13]

Hello,
I have a Kubota L3901 with 500 hours purchased two years ago with a FEL attached since I purchased it. I recently took off the FEL and sold it off because I never use it. Anyway, I had to plug the hydraulic ports that fed the FEL when I took it off and now my lift arms wont move up or down. I am thinking maybe I interrupted the hydraulic flow by plugging the ports after un hooking and selling the FEL. I attached a picture of the hydraulic ports that I plugged (in the picture they are not plugged, it's still hooked to FEL). So my question is: by plugging these ports, did I interrupt the Hydraulic flow which is why my lift arms are now inoperable?
Please help

 

[grsthegreat]

Im totally confused. If you sold off the fel......you dont have any lift arms to raise. .?????

 

[vineman13]

Sorry, I am talking about the rear lift arms or 3pt lift arms. At the back of the tractor.

 

[bcp]

Not familiar with your tractor, but some systems flow through the FEL valve, then to the 3 point lift system. You may have stopped that flow.

Bruce

 

[TMGT]

I wouldn't run the tractor anymore until you either get the right parts for your hydraulic block or put a hose to jumper the pressure port from the pump and the old power beyond port from the loader.
Right now your hyd pump is going against the relief everytime your engine is running which is not a good thing.

The person you sold the loader to would probably be willing to trade the plate for the hydraulic block so you don't have to have a hose made up.

 

[vineman13]

Thanks TMGT.
What would the correct parts for the hydraulic block be? I went to the dealer and they sold me the plugs to plug the ports. They said I could order a block that would do the same thing, but it would take a few days ect. So I went for the plugs. Would the block function differently than the plugs?
Any chance you could explain how I could use a hose to jumper the pressure port from the pump and the old power beyond port from the loader?
Thank you

 

[TMGT]

Do you have a picture of it with the plugs? The only port I know of that can be plugged is the return to tank port.
I wasn't able to pull up a diagram of the block on my phone.
I can't remember if the factory used a hose or seperate block cover that bolts on with the channels built into it like the older models.

 

[vineman13]

I don't have a picture, but it's basically 3 caps that cap the 3 ports the hoses use to connect to. I replaced the 3 hoses with the 3 caps. But it sounds like that cut off the hydraulics. Maybe the block the dealer said I could order has channels built in (like you said) therefore completing the hydraulic circuit.? thank you

 

[TMGT]

That's how the older units worked with the block cover completing the circuit, I doubt they changed anything for the L 01 models.

I found some information and it appears the top two ports need to be connected together, the bottom port is the tank port and can just be plugged.

 

[David_Kb7uns]

You have three ports, one from pump that went to loader,
one coming back from loader going back to the tank and the
one coming from the loader that is the power beyond feeding the rear three point.

The pump port must be connected to the one going to the three point so you have hydraulics and do not deadhead the pump, originally before the accessory block with the threaded ports was put on there was a plate with custom orings on it connecting the correct ports and blocking the unneeded one. You either need that plate or a hose connecting the 2 ports. Just hope you have not blown your pump as you have no relief valve in line now.

David

 

[TMGT]

You have three ports, one from pump that went to loader,
one coming back from loader going back to the tank and the
one coming from the loader that is the power beyond feeding the rear three point.

The pump port must be connected to the one going to the three point so you have hydraulics and do not deadhead the pump, originally before the accessory block with the threaded ports was put on there was a plate with custom orings on it connecting the correct ports and blocking the unneeded one. You either need that plate or a hose connecting the 2 ports. Just hope you have not blown your pump as you have no relief valve in line now.

David

I believe the L has a relief build into the hyd. block so hopefully everything is ok as long as it wasn't run too long.
A full on deadhead on the pump would most likely result in a noticeable result be it noise or fluid.

 

[vineman13]

Ok, that helps a lot. Thank you I really appreciate the help. I haven't run the tractor more than a min or two while trying to pick up my mower. I didn't notice anything out of the ordinary yet so hopefully everything is ok. I'll go ahead and order the block or plate that I should have ordered in the first place. In the meantime I might try and find something to connect the two ports so I can get to mowing.
Thanks again

 

[LD1]

Yes.....you simply cannot plug them three holes.

The top right port is coming from the Pump.....labeled P
The bottom is simply return.
The top left is what feeds your 3PH....labeled PB

See attached of how it looks with a loader attached:


Under normal operation with a loader.....pressure came out the P port and went to the loader valve.
If you were operating the loader.....return flow went into the return port.
If you were not operating the loader....the pressure flow would simply pass right through the loader valve (open center), and return to that block VIA the PB port....where it went on to feed the 3PH.

So the Top two ports ABSOLUTELY need connected to run the 3PH. Your dealer was mis-informed when he told you that the plate for non-loader tractors "basically just plugged the ports".

I agree that you should contact whoever you sold the loader to. If they have intentions of installing it on a kubota....they are gonna want that block.....and you are gonna want the one he has. Save you both from having to buy it at a dealer.

And simply running a short hose to connect the two is fine for temporary....I wouldnt want to leave it like that. Too much risk of snagging it on something by the time loop around to make that bend

 

[vineman13]

Thanks LD1. One thing I am not sure of is which block you are talking about that the buyer of my FEL has. I don't think I gave him a block with the control or hoses. this is the same block that I need to order? Thanks

 

[TMGT]

Yes.....you simply cannot plug them three holes.

The top right port is coming from the Pump.....labeled P
The bottom is simply return.
The top left is what feeds your 3PH....labeled PB

See attached of how it looks with a loader attached:
View attachment 537752

Under normal operation with a loader.....pressure came out the P port and went to the loader valve.
If you were operating the loader.....return flow went into the return port.
If you were not operating the loader....the pressure flow would simply pass right through the loader valve (open center), and return to that block VIA the PB port....where it went on to feed the 3PH.

So the Top two ports ABSOLUTELY need connected to run the 3PH. Your dealer was mis-informed when he told you that the plate for non-loader tractors "basically just plugged the ports".

I agree that you should contact whoever you sold the loader to. If they have intentions of installing it on a kubota....they are gonna want that block.....and you are gonna want the one he has. Save you both from having to buy it at a dealer.

And simply running a short hose to connect the two is fine for temporary....I wouldnt want to leave it like that. Too much risk of snagging it on something by the time loop around to make that bend

LD1 is refering to the plate that mounts to the hydraulic block that the hoses for the loader attach to under the tractor (what you put the l plugs into).

If you can get ahold of the person you sold the loader to you can exchange plates and both save a trip to the dealer to spend money.

Hopefully someone with a workshop manual can post the page on the hyd. block, pictures are worth 1000 words.

 

[vineman13]

I have that plate, It's still on the block as I never took it off. I shouldn't have used "plug" when describing how I closed the 3 open ports. They are actually caps that screw into the male threaded ports. Does that change anything? I was under the impression I needed to switch this plate that I capped with another plate?

 

[Dan33Klein]

No it doesn’t change anything. You can only cap off the tank drain port. The pressure port that comes from the pump needs to be connected to the power beyond port that goes to the 3pt to complete the loop. You will damage it the way you have it.

 

[LD1]

CAps, plugs,....no difference.

The aluminum plate that things were attached to.....where you put the plugs/caps......that whole plate needs to come off and be traded.

Yellow arrow is pointing to what you need to remove.
Green circles are the bolts

 

[ovrszd]

I agree, you two guys need to swap blocks. If he's already purchased your style block, maybe you can buy his.

 

[gator]

vineman13,
The following pictures (your original on top in pic 1) may help clarify. The bottom of pic 1 shows what the non FEL cap (plate) will look like. Pic 2 shows what the non FEL cap does, it routes the pressure from the hydraulic pump (P) from (A) (which used to go to your FEL control valve than back with your aluminum plate) to (B) to (C) which is to your to your 3 point hitch.