Hydraulic question on a Kubota M 6800

[Willl]

No they dont,I can leave mine in shed all nite,with something on 3pt and it will still be up in the morning when I go back.

I'm glad for you.

What if it's off for a week ?

 

[J_J]

This was a quote from somewhere ?

Got a link ?

http://www.tractorsmart.com/main/Tractor Three Point Lift Types.htm

 

[Willl]

http://www.tractorsmart.com/main/Tractor Three Point Lift Types.htm

Sweet. Just so were all on the same page here, we're all talking about 'position control', correct ?

Position control. This nifty lift type has some extra parts called feed back linkage. This linkage can be either internal or external, yet it's purpose remains the same. Feed back linkage serves to return the control valve (automatically) to the neutral state as soon as the lift arms reach the point selected by the relative position of the lift control lever. Whereas the non position control type only has three positions (raise, lower or neutral), the position control type allows an infinite number of lift arm positions, from all the way down, to all the way up. If you regularly perform tasks that require precision, repeatable lift arm height control, definitely get the position control type of lift. Now, take a deep breath and get ready for?

 

[HCJtractor]

So from what I understand, if I lifted the drill and it was stationary, the 3 point would be in neutral, therefore the FEL should work normally. Right??
Then if that is the case, my hydraulics are not working properly because when I had it lifted, the FEL would barely work, but when I lowered the drill and sat it on the ground, the FEL resumed working. So it seems I have a problem. The amount of weight on the 3 point should not matter as long as it was under the max lift capacity, and was stationary.

And to answer the leaking question, I have never noticed any leakage in the system. I don't know if things would stay lifted as I always lower everything when I shut the tractor off just to relieve pressure.

 

[Willl]

So from what I understand, if I lifted the drill and it was stationary, the 3 point would be in neutral, therefore the FEL should work normally. Right??
Then if that is the case, my hydraulics are not working properly because when I had it lifted, the FEL would barely work, but when I lowered the drill and sat it on the ground, the FEL resumed working. So it seems I have a problem. The amount of weight on the 3 point should not matter as long as it was under the max lift capacity, and was stationary.

And to answer the leaking question, I have never noticed any leakage in the system. I don't know if things would stay lifted as I always lower everything when I shut the tractor off just to relieve pressure.

I'm thinking the same.

 

[Willl]

JJ, I believe your "quoted data" is about the first type of 3pt that this article refers to. Correct ?

Is this the type of 3pt that you believe his tractor has ?

Would be nice if you quote something to note that it was a quote and a link. Just out of courtesy for the author.


Edited:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

Excerpt:

I stand corrected, you did note it. I missed it.

 

[rambler]

I think perhaps JJ got sidetracked by some 'different' type of 3pt operations, and not relating to this particular case. Or he is using some terminology that most folks do not relate to. So, for me, just totally forget about any 'nuetral' on a 3pt.....

When you move the 3pt lever up, the linkages lift up the 3pt hitch a related amount using oil pressure from the hyd pump, and then keep the arms at that height.

IF the load is too great to be lifted, oil will bypass through a relief valve. Because you have the 3pt lever set up, the linkage will continue to try to flow oil through the 3pt arms and continue to try to lift the load. It may get the load lifted slowly, jerky, or only part way, but never make it all the way up to go into it's calm, normal, helpd in place mode. All the while, the oil is bypassing through a relief valve, because it just can't quite get those 3pt arms up as high as asked for.

Doesn't hurt your tractor for a minute or two, it's designed for that, but for a longer period, it heats up the oil, works the hyd pump extra hard, and puts wear on the system. Not so good for a longer peroiod.

Since oil is being asked for by your 3pt, and it's being bypassed through a relief valve, there is very little or very poor or very low amount of oil available for your loader to use.


Or put another way, you are overloading your 3pt, and so there ain't no oil left to run your loader. Stop doing that..... The drill is too heavy for your tractor to get it all the way up.

--->Paul

 

[rambler]

So from what I understand, if I lifted the drill and it was stationary, the 3 point would be in neutral, therefore the FEL should work normally. Right??
Then if that is the case, my hydraulics are not working properly because when I had it lifted, the FEL would barely work, but when I lowered the drill and sat it on the ground, the FEL resumed working. So it seems I have a problem. The amount of weight on the 3 point should not matter as long as it was under the max lift capacity, and was stationary.

And to answer the leaking question, I have never noticed any leakage in the system. I don't know if things would stay lifted as I always lower everything when I shut the tractor off just to relieve pressure.

I farm, have several tractors with 3pt, I end up trying to lift round bales that are too heavy for the little tractors, picked up a big 15 row bean planter with a smaller tractor because it needed to be moved, etc. Anyhow, I have some experience with stalling out a 3pt.

Often a 3pt can lift a heavy load 1/2 to 3/4 of the way up, but the top part the geomotry of the arc makes it a harder pull to get that last little bit.

I suspect - from your diescription of what happens - that your tractor is overloaded by this drill, and it is only lifting the drill 3/.4, or 7/8, or whatever. The relief valve is pushing oil because it can't quite lift the drill, and so the loader is not getting oil beause the 3pt continues to demand and relief the oil.

On level ground, lift up the drill. Try the loader. If it doesn't respond well, lower the 3pt lever a little bit. Don't really lower the drill much, but lower the lever some. Try the loader again. Repeat. See if at some point, before the drill gets to the ground, the loader becomes responsive. This would be as high as yout tractor can comfortably raise the drill. Getting higher than that, you are overloading the 3pt.

3pt lift is figured at some exact point behind the 3pt arms. Maybe 8 inches, or a foot, or whatever. Your drill is much longer, so even if it weighs less than the 3pt rating, thelever effect can still be overloading your 3pt.

--->Paul

 

[Willl]

Totally agree Paul.

"it's calm, normal, held in place mode", you almost said neutral here didn't ya ? :laughing:

HCJ, does it really struggle to get to the 'lever/handle' position ?

Have you tried like a 7/8ths type position (slightly lower then very, very top) in your lever/handle to see if this repeats ?

And finally, does it make any type of noise like it's going it to relief ?

 

[rambler]

"it's calm, normal, held in place mode", you almost said neutral here didn't ya ? :laughing:

You were reading my mind as I was typing, actually grinned to myself.

I know what JJ is saying, but it is coming out awkwardly here, so trying to get at it from a different angle.

--->Paul