Kubota L3400HST 3-Point Lift Issues
- Thread starter BLane3400
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Chilly807
Elite Member
Other than possibly mis-placed hydraulic hoses, it sounds like there may be more issues than just the engine. If I get a chance tonight I'll take some pictures of the hose routing on mine from the loader to the 3 ph so you can compare that to yours.
It might be the return hose from the loader plumbed into the inlet of the 3 ph, which would give the 3 ph a shot of oil every time the loader moved. The fact that it works better at high rpm and not at idle is odd, if the cylinder was messed up it shouldn't hold it's position after the rpm came back down.
It might be worth your while to take a close look at the linkage from the position control lever to the 3 ph valve, as well as the feedback linkage from the lift arms to the valve.
Sean
It might be the return hose from the loader plumbed into the inlet of the 3 ph, which would give the 3 ph a shot of oil every time the loader moved. The fact that it works better at high rpm and not at idle is odd, if the cylinder was messed up it shouldn't hold it's position after the rpm came back down.
It might be worth your while to take a close look at the linkage from the position control lever to the 3 ph valve, as well as the feedback linkage from the lift arms to the valve.
Sean
Try disconnecting the loader valve hoses at the couplers, like you were taking the loader off the tractor. When you do this, you will hook the pump hose to the lift hose to complete the circuit. The return hose is left un-connected. Will the lift work now? This will eliminate any problems in the loader valve.
Trace the hoses to their locations if your unsure which hose is which.
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Trace the hoses to their locations if your unsure which hose is which.
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The local shop is going to call when they get a spot open...so I'm still playing with the tractor. I used the FEL this afternoon for about 15 minutes, got off to double check for leaks, and noticed the lines were hot. Not sure if this is normal...I'd say they were 110-130 degrees. Is that bad?
Nope, not unless it is hot where you are 
Likely the hydraulics are "on pressure" ..your Kubota should idle smoothly with no hissing in the valve or pump area. Pop those hoses off like I posted earlier, and connect the pump and lift together, I think it shows you how in the owners manual.
Another check is to "feel" the hoses with the engine off, then do it again with it running. Should not be any "tight" hoses.
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Likely the hydraulics are "on pressure" ..your Kubota should idle smoothly with no hissing in the valve or pump area. Pop those hoses off like I posted earlier, and connect the pump and lift together, I think it shows you how in the owners manual.Another check is to "feel" the hoses with the engine off, then do it again with it running. Should not be any "tight" hoses.
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Chilly807
Elite Member
The attached pictures show where the connections should be for the loader and 3 point hitch. The three hoses shown terminate at the connection plate under the right side floorboard, and at the loader valve. The fourth hose (remote return) in the first picture is tee-d into the return line loader valve, and isn't a factor.
I have a rear remote connected between the loader valve and the 3 point, so the outlet from the power beyond on my loader valve goes to the inlet of the remote valve. Yours should go to the 3 point connection as shown in the pics.
Sean
I have a rear remote connected between the loader valve and the 3 point, so the outlet from the power beyond on my loader valve goes to the inlet of the remote valve. Yours should go to the 3 point connection as shown in the pics.
Sean
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Chilly807
Elite Member
In these pics the green arrows indicate fluid flow direction.
It might be worth checking the system pressure, at idle it should be no more than a couple hundred psi, if that, as long as nothing is being operated hydraulically. If it's going over the relief valve all the time it'll be about 2200 psi.
Sean
It might be worth checking the system pressure, at idle it should be no more than a couple hundred psi, if that, as long as nothing is being operated hydraulically. If it's going over the relief valve all the time it'll be about 2200 psi.
Sean
Attachments
Great pics Chilly807 just what was needed here :thumbsup: ...BLane3400 do you see the top two hoses in the pic with the silver block? The loader will work with those hoses swapped, but your 3pt lift will act like you have been saying.
When you take this loader off, does the loader valve stay with the tractor? I think from looking at the pictures, that I assumed that the valve stayed with the loader. I apologize if I confused you. :ashamed:
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When you take this loader off, does the loader valve stay with the tractor? I think from looking at the pictures, that I assumed that the valve stayed with the loader. I apologize if I confused you. :ashamed:
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