L 4300 backhoe problem

[Christopherjmccaw]

Right side outrigger went down on its own while driving thru the woods lifting rear of tractor and stopping it try to raise it and the control lever will not move also lost all other functions on the backhoe it will only twitch sometimes and levers are stiff also front end loader works good



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[North Idaho Wolfman]

You will need to get into the BH controls (check linkages first), you have the valve for the outrigger stuck active.

 

[Christopherjmccaw]

Removed cover and checked linkage it is all ok, removed quick connects to check for a flow problem with them they are ok, reassembled and tried it, got all functions back but the right side outrigger it is still stiff, maybe there is an obstruction in the valve return spring cap could that cause all other functions to quit.


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[Grandad4]

You don't say if the backhoe is a Kubota attachment or a non-OEM brand. The Kubota factory backhoes that would fit an L4300 were a BL4690 (7 1/2 ft, 3 point attachment type), or a 4560 (9 ft, subframe type). Both of those backhoes used a PTO operated pump that was independent of the tractor or loader hydraulics.

First, specifically what backhoe is on the tractor? Next, if it's one with a PTO pump, is the PTO engaged? Is there fluid in the hydraulic reservoir on the backhoe? Had the backhoe been working previously?

If the outrigger dropped on its own while you were going through the woods, it sounds like maybe a line got snagged, cut or just failed. Any such indications?

 

[Christopherjmccaw]

It is a subframe mounted backhoe OEM made it does not have a PTO operated pump the fluid level is good and was changed less than 10 hours ago there are no leaks or indications of a damaged hose, I will check the model later as the machine is stuck

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[Grandad4]

Good luck getting it back to where you can look at it.

 

[Lil Foot]

You say the outrigger dropped while driving the tractor through the woods, stopping it. Did it bend the ram?

 

[Christopherjmccaw]

Yes it dropped while moving lifting the machine and stopping it I now got it to go up after working lever back and forth but the lever still doesn't have full travel the ram doesn't appear to be bent I I was going very slowly when it happened I got it out of the woods I think there is a foreign object in that section of the valve or corrosion in the return spring cap.

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[Grandad4]

The other functions (other outrigger, and the actual BH movements), stopped working until you disconnected and reconnected the hyd couplers from the tractor. After that, they resumed working properly, right? Still working OK?

And no glitches to anything on the tractor itself, yes?

When you were travelling through the woods, did you have the BH "live" or was it pinned up and the hydraulics to the BH shut off? I'm no hydraulics expert but was wondering if something failed inside the hydraulic circuit and some debris temporarily blocked the hyd flow. If that's true, would be concerned if debris has re-circulated back into tractor hydraulics.

 

[North Idaho Wolfman]

If the valve for the outrigger was stuck active it will disable all other hydraulic functions to other valves, it's designed that way, wouldn't want to activate the outrigger and start it swinging.

 

[Christopherjmccaw]

Yes everything but the right outrigger began working correctly after I removed the quick connects and blew air thru them to check for restrictions I left them disconnected in case the outrigger went down again. Everything else has worked good since. I didn't try digging or working with it moved swiftly just like it did before. There are no other glitches besides the right outrigger. The backhoe wasn't pinned and I didn't have the backhoe circuit shut off.

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[Grandad4]

Did you ever figure out if it's one of the Kubota BH models I mentioned, particularly the 4560? That's the subframe model for an L4300 (I have the 4560 on my tractor). That seems unlikely to me since it's a PTO pump + reservoir design, so I'm wondering if you've got a later model such as a BH90 that's powered by the tractor hydraulics, that someone creatively figured could be retrofit to an earlier model tractor such as yours.

On the 4560, the outrigger controls are integral to the main control valve block and internal repair parts are available. Ditto for BH90 and other Kub BH models, I suppose.

 

[Christopherjmccaw]

No I haven't gotten a chance to look at the model, sorry I work to much it's got a valve made up of 6 sections it's a 2004 model year tractor

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[Grandad4]

Any chance your tractor is an L4330, not L4300? That would explain the non-pto pump BH setup on your tractor. Kub was making both tractor models in 2004, and they had very different hydraulic setups. The 4300 took a BH with the pto pump (4690 or 4560) while the 4330 took the newer hoe that ran off the tractor hyd. (BH90). The tractor manufacturers all seem to do this sort of thing with their model numbers, just to confuse the heck out of everyone, I guess.

If something is indeed boogered up in the control valve, you'll need to have the right model info to get the right replacement parts.