Going back to dealer!

[hunt4570]

Kubota L3540 HST/L724 FEL

Having loader problems. All works fine except seems like there is no breakout force! I can pick up a bucket full of wet sand (plenty of power), leave it raised for hours with no bleed down to speak of (no internal leaking) , but say I use my grapple to pry a big root out of the ground or something, or try to push or pull the tractor with the bucket curl... seems like I have a dead stick! It doesnt moan and groan like its trying, just nothing. So before I get this thing stuck, with no ability to walk myself out with assistance from the loader, its going to the dealer to see what they can find.

I searched, and posted new about this here and at Orange Tractor Talks, but I'm getting no advice that will work , I'll let you know the outcome.

Man I hope they can get it done quick, I hate to lose my tractor!

 

[TripleR]

Good luck, if disconnecting/reconnecting hose don't do it, I'd sure get the dealer on it, I've gotten out of a lot of messes with the curl/dump function. Out of curiosity, does it act the same with the bucket as grapple? The reason I ask is with my pallet forks, my curl/dump is very weak due to the length of the tines.

 

[Soundguy]

i'd be pulling hte lines to curl / dump to see if they pressurize, er.. or at least flow in correct directions with spool operated.. the hookup to cyl with one end unpinned.

ditto on question about curl/dump working with loader bucket?

 

[hunt4570]

Good luck, if disconnecting/reconnecting hose don't do it, I'd sure get the dealer on it, I've gotten out of a lot of messes with the curl/dump function. Out of curiosity, does it act the same with the bucket as grapple? The reason I ask is with my pallet forks, my curl/dump is very weak due to the length of the tines.

Yes, bucket and grapple exactly the same..

 

[hunt4570]

Good luck, if disconnecting/reconnecting hose don't do it,

Not sure I understand.

 

[hunt4570]

i'd be pulling hte lines to curl / dump to see if they pressurize, er.. or at least flow in correct directions with spool operated.. the hookup to cyl with one end unpinned.

ditto on question about curl/dump working with loader bucket?

The curl/dump works just fine in mid air.. just no power there. Lets say I dump the bucket, then lower to ground and backdrag.. it holds its own, doesnt curl back up or anything.. just no power to pull or pry with it!

 

[Fiziksgeek]

relief valve maybe? would explain why the loader functions with no load, but the minute you try to use it, you get nothing.

 

[hunt4570]

relief valve maybe? would explain why the loader functions with no load, but the minute you try to use it, you get nothing.

Maybe.. I'm pretty mechanically inclined, but hydraulics are pretty much a mystery to me!:confused3:

 

[Fiziksgeek]

Maybe.. I'm pretty mechanically inclined, but hydraulics are pretty much a mystery to me!:confused3:

Me too! About all I have figure out if that flow relates to speed and pressure relates to strength. So, if something moves, but is weak, it likely pressure related....

 

[Soundguy]

Does curl/ dump have its own relief?

Evidentally the check valves are good and it is cycling oil if the bucket moves under load.

One thought, blown cyl packing.

Leave lift hose in, remove dump hose, pressurize lift, see if oil blows out dump.

Remember dump lift swap depending on spool direction

 

[bumperm]

This may have nothing to do with your problem, but you are aware that most newer Kubota tractors/loaders have a regenerative dump function that takes up part of the range of motion of the joystick. While in the regen part of the joystick range during dump or "uncurl", hydraulic pressure is applied to both sides of the curl cylinder by connecting both ports of the cylinder together to allow a faster uncurl or dump. So far so good . . . but when the bucked edge is on the ground with resistance to movement, this regen function can make it seem like the bucket has no power and the stick must be moved out of the regen range to move the bucket with force.

The regen function can be in the first or last part of joystick travel. There can be stick resistance to get from one to the other.

 

[TripleR]

Not sure I understand.

Sorry, my point is I have limited knowledge of these systems, but sometimes, I've had a bad connection or coupler and checking these is the most I can do without dealer assistance. Recently when I had my third function installed by the dealer, I had a coupler fail and replacing it fixed the problem.

 

[bx25jim]

This may have nothing to do with your problem, but you are aware that most newer Kubota tractors/loaders have a regenerative dump function that takes up part of the range of motion of the joystick. While in the regen part of the joystick range during dump or "uncurl", hydraulic pressure is applied to both sides of the curl cylinder by connecting both ports of the cylinder together to allow a faster uncurl or dump. So far so good . . . but when the bucked edge is on the ground with resistance to movement, this regen function can make it seem like the bucket has no power and the stick must be moved out of the regen range to move the bucket with force.

The regen function can be in the first or last part of joystick travel. There can be stick resistance to get from one to the other.

Been there and done that too....What he said.........

Dont know if this will work for you,and you may already know this, But......
Before you take it to the dealer, start the tractor, lower the boom to the ground. let go of the controls, when bucket gets to the ground. Push the control as if you are going to dump the bucket (Bucket will not curl under). While holding the control to the right for dumping.....give the control a little extra push....to the right. It may feel as if it wont go, but there is another function in the stick that forces pressure to make the bucket curl under as he said above, Its just on another detent. Dont ask how I figured this out. Long story.....

 

[bjr]

Kubota L3540 HST/L724 FEL

Having loader problems. All works fine except seems like there is no breakout force! I can pick up a bucket full of wet sand (plenty of power), leave it raised for hours with no bleed down to speak of (no internal leaking) , but say I use my grapple to pry a big root out of the ground or something, or try to push or pull the tractor with the bucket curl... seems like I have a dead stick! It doesnt moan and groan like its trying, just nothing. So before I get this thing stuck, with no ability to walk myself out with assistance from the loader, its going to the dealer to see what they can find.

I searched, and posted new about this here and at Orange Tractor Talks, but I'm getting no advice that will work , I'll let you know the outcome.

Man I hope they can get it done quick, I hate to lose my tractor!

I'm a brave sort. This will be evident shortly. I went thru something similar on my import tractor. I rebuilt the 3 pt lift cylinder and still had the same results, no power when the system was hot. Well I needed the tractor and couldn't afford to mess around with it, so, I thought I'd try some oil additive (Lucas Hydraulic oil Booster with some kind of thermal enhancer) and, you know what, it really worked. I was able to get the mowing raking and baling finished with the 3 point raising fully all day long (not just when cold). Okay all you no oil additive guys can jump all over me now. Just sayin', see what kind and weight of oil your using. bjr

 

[bumperm]

I'm a brave sort. This will be evident shortly. I went thru something similar on my import tractor. I rebuilt the 3 pt lift cylinder and still had the same results, no power when the system was hot. Well I needed the tractor and couldn't afford to mess around with it, so, I thought I'd try some oil additive (Lucas Hydraulic oil Booster with some kind of thermal enhancer) and, you know what, it really worked. I was able to get the mowing raking and baling finished with the 3 point raising fully all day long (not just when cold). Okay all you no oil additive guys can jump all over me now. Just sayin', see what kind and weight of oil your using. bjr

No jumping involved. I sure would not use ANY additives to the hydraulic fluid on a newer Kubota HST tractor. The spec is Super UDT2 fluid . . . and that's it . . . period. I am not brave enough to risk damaging the tranny or experiencing the mysterious untoward nefarious inclinations of machinery gone rogue. The potential for expensive damage is just to high.

bumper

 

[hunt4570]

Sorry, my point is I have limited knowledge of these systems, but sometimes, I've had a bad connection or coupler and checking these is the most I can do without dealer assistance. Recently when I had my third function installed by the dealer, I had a coupler fail and replacing it fixed the problem.

I have heard of this also, how did you determine that was it? I dont just want to start replacing things at random.

 

[hunt4570]

Been there and done that too....What he said.........

Dont know if this will work for you,and you may already know this, But......
Before you take it to the dealer, start the tractor, lower the boom to the ground. let go of the controls, when bucket gets to the ground. Push the control as if you are going to dump the bucket (Bucket will not curl under). While holding the control to the right for dumping.....give the control a little extra push....to the right. It may feel as if it wont go, but there is another function in the stick that forces pressure to make the bucket curl under as he said above, Its just on another detent. Dont ask how I figured this out. Long story.....

I will try this next time I'm on the tractor. The tractor is a 2011 model if anyone knows when they added this "feature".

 

[hunt4570]

I'm a brave sort. This will be evident shortly. I went thru something similar on my import tractor. I rebuilt the 3 pt lift cylinder and still had the same results, no power when the system was hot. Well I needed the tractor and couldn't afford to mess around with it, so, I thought I'd try some oil additive (Lucas Hydraulic oil Booster with some kind of thermal enhancer) and, you know what, it really worked. I was able to get the mowing raking and baling finished with the 3 point raising fully all day long (not just when cold). Okay all you no oil additive guys can jump all over me now. Just sayin', see what kind and weight of oil your using. bjr

This works this way hot or cold. My "oil" transmission/hydraulic fluid is Kubota UDT, the recommended fluid from big K!

 

[hunt4570]

No jumping involved. I sure would not use ANY additives to the hydraulic fluid on a newer Kubota HST tractor. The spec is Super UDT2 fluid . . . and that's it . . . period. I am not brave enough to risk damaging the tranny or experiencing the mysterious untoward nefarious inclinations of machinery gone rogue. The potential for expensive damage is just to high.

bumper

Actually the spec is Kubota UDT or Super UDT, the difference is the Super is a synthetic oil..

 

[bx25jim]

Dont know when they added it, but I found it by accident. It was not listed anywhere and I could not find any info on it and was really getting frustrated when mine was doing the same as you state in you original posting and untill another member started commenting on my thread I had running and shined some light on the matter. Give it a try, and let us know what happens.