Upon further review looks like the relief valve didn’t work because there isn’t one looks like just a plug was installed nice. 750 for the whole thing off another tractor.
Kubota L35 big mistake on hydraulic loader valve looking for advice.
- Thread starter Fluke216
- Start date
If no relief on the loader vslve there must be a tractor side relief.
If you can get a complete used valve in servicable condition for $750 I would say its tine to hit the road.
Dan
Ok right I’m going to try and go get it.
Here’s where it shows the relief valve on top of the transmission. I took the seat off and cover and it’s just a bolt in there so I guess maybe there’s another one at a different location ?
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Ok sorry just to clarify I didn’t see any relief valve on the loader valve at all. Just this on the transmission which I think I was wrong, I think it is the relief valve that I’m assuming was rusted shut and not functioning ? Is there a way to clean this up or should I replace it. Thanks
Then If for some reason this guy Dosent get back to me and I end of not getting the part. I guess my options are contact husco and try and get a replacement section and rebuild it. Or go with an after market and not have the float function?
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Understand what you are and are not getting. The OEM boom section is a serial circuit with 4th position float.
Dan
I’m slightly confused. Also I think I said the wrong thing looks like the back valve is the bucket control. Trying to understand, as you mean if not replaced oem there will be no float function or something else please dumb it down if you need to or maybe I was missing what you meant sorry and thank you.
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Hard to see the images but both valves are clearly 4 position.
Boom section has a 4th float podition and its a serial circuit meaning it works in synch with the bucket section. That serial operation is a very useful feature that most people dont understand. It makes it possible to operate both the boom and bucket simultaneously without one function stalling the other.
Bucket section has a regenerative spool which provides a fast dump operation.
I suspect that $300 section has none of those features. If you are replacing the bucket section not a big deal. If its the boom section its most definitly a concern.
Dan
Ok Thank you for that Explanation much appreciated. yes the Bucket Section is the one that blew up as i guess makes sense its the function that wasn't working it would dump but not roll back the boom was going up and down fine. The bucket section is not much of a concern because you are only losing the fast dump? and the boom is problematic because using the bucket at the same time may cause the boom function not to work? I'm planning on going to get this whole valve unless something falls through and he changes his mind. I guess these Husco Sections are proprietary and you couldn't get the exact one for replacement . Would the after market valve not function the same you would either be lifting or dumping but couldn't do both simultaneously? Or your saying if replaced with a different husco section that wont function the same.
Here's a badestnost that says 2 spool with float would that function same as oem?
Hydraulic Floating Valve with Joystick 80 l/min (21GPM) 2 Spool Floating Spool Double Action
A quality user-friendly hydraulic control valve with joystick. Two floating double-action spools, an 80 l/min flow rate and a regulated relief valve are its great virtues.
www.hydraulic-master.com
Sorry for all the questions just trying to understand eveything a little better. Thank you for all the answers
First let me clarify serial vs parallel. Most valves are 100% parallel. So when you raise the boom and curl or fump the bucket simultaneosly both sets of cylinders are fed in parallel and the set with the most load will stall until the load on the other set drops to match. Both functions work but not in lockstep. With a serial section for the boom the boom cylinders are feeding the bucket cylinders and both sets move together. You have been spoiled by that serial opetarion and will immediately notice the difference. Simultaneous lift/lower and roll/dump will not be nearly as smooth and easy to control.Ok Thank you for that Explanation much appreciated. yes the Bucket Section is the one that blew up as i guess makes sense its the function that wasn't working it would dump but not roll back the boom was going up and down fine. The bucket section is not much of a concern because you are only losing the fast dump? and the boom is problematic because using the bucket at the same time may cause the boom function not to work? I'm planning on going to get this whole valve unless something falls through and he changes his mind. I guess these Husco Sections are proprietary and you couldn't get the exact one for replacement . Would the after market valve not function the same you would either be lifting or dumping but couldn't do both simultaneously? Or your saying if replaced with a different husco section that wont function the same.
Here's a badestnost that says 2 spool with float would that function same as oem?
Hydraulic Floating Valve with Joystick 80 l/min (21GPM) 2 Spool Floating Spool Double Action
A quality user-friendly hydraulic control valve with joystick. Two floating double-action spools, an 80 l/min flow rate and a regulated relief valve are its great virtues.
Sorry for all the questions just trying to understand eveything a little better. Thank you for all the answers
The Badenost is a purely parallel valve and it does not hsve float or fast dump. It would work fine and you would get use to the parallel behavior but the loss of float would be a deal killer for most people.
Husco sections to match Kubota's can be ordered from 3rd parties but you will be well into 4 figures price wise and lead times are likely months.
Dan
You got it right. The boom section is in front (first), then the bucket in back. The implement pump flow rate is 11gpm, 17gpm includes the power steering/transmission pump.
If it were mine, I'd keep the OEM setup, even if it's $6-700. That setup sure works sweet. That Husco catalog only covers the basics, it doesn't address series passages or regen, I think. The handedness is also available both ways, the TL720 loader valves are opposite the catalog, if I remember correctly.
OP needs to figure out why that broke. The relief valve, located on the 3ph valve, is ahead of the loader so a relief is not required on the loader valve. It needs to be inspected and tested.
Another possibility is that the bucket maybe was forced externally. There are no port reliefs, but I think this is not probably the cause. Also, I haven't traced that channel, but I don't think a port overload goes there.
Another thing to check out - maybe got the tank and power beyond (Husco calls it carryover or something) hoses reversed. If the tank port was blocked by not looping the backhoe hose, the tank channel may not be able to withstand full pump pressure. I'll go back to the Husco catalog and try to figure out which channel broke.
OK, it looks like the tank passage (low pressure) is the one that blew out. @Fluke216, make sure the tank hose is connected correctly and not plugged. @TheOldHokie, do you see any other way this might be over pressured?
North Idaho Wolfman
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If you can get the OEM valve for the $750 I would go that way.
There are a lot of other things that could happen if you change to non OEM valves.
When you take the BH off you need to either loop the hoses together or you need to turn this spool valve to bypass the flow to the BH.
There are a lot of other things that could happen if you change to non OEM valves.
When you take the BH off you need to either loop the hoses together or you need to turn this spool valve to bypass the flow to the BH.
I assumex the blocked neutral just blew every thing on the bottom out. But if the bucket spool is shifted to "slow extend" the blocked tank core will see roghly 1.5 times inlet pressure so jaybe tgats what happened. What is tractor side relief set to and whats the rated max on the valve?
Dan
North Idaho Wolfman
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Staff member
Lifetime Member
Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
The L35 only hits a relief valve on that circuit if the BH is in place or the spool on the outlet is turned.
Yes it's a bad design in the way they made the relief at the end of the loop.
I believe it's done this way because that BH does not have a PB like newer valves, but I'm not sure.
That cant be right. Without a inlet relief on the loader valve people could/would fry the pump in everyday loader use.
Dan