Kubota hydraulic problem ?

[RickB]

Thank you all for the replies.

First, let me say that I have heard of the problem of back dragging the bucket
and I have never done that nor have I ever put any down pressure on the forks
when they are on the bucket.

Just to make sure I understand what was said, let me mention again that even
when the load (325 to 375 #) was hanging from the front edge of the bucket (not out from the bucket edge on the forks any way at all),
that the curl would hold and not tilt down when I was not touching the control lever,
but if I moved the control lever to curl back the bucket, that is when the bucket tilts down instead of curling back.

In fact when I at first had the load attached at midway on the forks (about 18" from the bucket edge), the bucket would still
hold it own until I tried to curl it back. In other words, it would only tilt down when I was moving the control lever to curl it up.

According to the first sentence in RickB's quote above, that would seem to indicate that the problem is not the cylinders.

Even so, does that mean that the problem could still be in the curl cylinders or not ?
No.
Or does that mean that the problem is elsewhere ?
1.Relief pressure is too low.
2.The load is too great.
And when I make the tests in post #4, and if the cylinders pass the tests, what then could the problem be ?
Without establishing cylinder drift with the control spool centered, post #4 tests are a waste of time.

And if it's a messed up valve in the control, is there any way to test for that ?

Connect both curl circuit hoses to the lift circuit QA connectors and the lift circuit hoses to the bucket circuit QA connectors.

 

[Arky217]

Connect both curl circuit hoses to the lift circuit QA connectors and the lift circuit hoses to the bucket circuit QA connectors.

Thank you RickB for the quick reply.

I think I see what you're saying to do.

So if I change the connections as you say,
then I assume the curl will be stronger and the lift will be weaker ?

So, is there a separate relief valve for the curl and a separate relief valve for the lift ?

How do I check the relief pressure and what should it be ?

Is the relief pressure valve (or valves, if one for curl and one for lift) located in the in the control assembly ?

Any way to check it without a pressure gauge ?

 

[RickB]

Thank you RickB for the quick reply.

I think I see what you're saying to do.

So if I change the connections as you say,
then I assume the curl will be stronger and the lift will be weaker ?
I believe your results will be the same as your experiences as posted in post #1.
So, is there a separate relief valve for the curl and a separate relief valve for the lift ?
No.
How do I check the relief pressure and what should it be ?
With a gauge. I can't quote the exact spec, it will be published in your operator manual.
Is the relief pressure valve (or valves, if one for curl and one for lift) located in the in the control assembly ?
I believe it is mounted on the hydraulic pump
Any way to check it without a pressure gauge ?Not with any degree of accuracy

Responses imbedded.

 

[Dave M7040]

The simple test is to swap the lines on your loader valve so that the lift arm circuit is controlling the bucket. If the problem goes away then you have determine the valve is the problem.

Dave M7040

 

[wdchyd]

The simple test is to swap the lines on your loader valve so that the lift arm circuit is controlling the bucket. If the problem goes away then you have determine the valve is the problem.

Dave M7040

If not .......then read reply #3