B7510 3 point problem

[Kohler]

Just purchased a new B7510, front end loader, tiller, box blade, bush hog, etc. The problem is the three point seems to keeps falling all the way down after about 30-45 minutes. In my opinion an internal hydraulic leak in the system. This is getting especially anoying when working with the loader, because I need to keep raising the 3 point implement every 20-30 minutes, or just start dragging whatever is connected across the ground. My pasture looks torn up where the bush hog starts dragging when I'm not looking at it.

Took it to the dealer once and they replaced something in the 3 point system, but it keeps doing it. The dealer service guy just tells me to bend down and close the valve and that will lock it in position. Not much of an answer and not very ergonomic when I'm tilling or box blading. And not in agreement with the manual about what that valve is for.

The rest of the tractor is great, but very dissapointed with the quality of the product and service with the three point hitch. The inability of the three point to stay up with the engine running is ruining my ability to use the tractor to its alleged capability, and messing up my land. I'm just about ready to stop making payments and let them take the thing back. Then they will have to fix it to resell it!

Anyone else have this problem or any suggestions?

 

[Steve02]

From what I've read about a lot on here Kobota's hydrolic cylinders have a leak-down problem. If that is what your's is doing then I would say that you have a decent case to get the effected cylinders replaced under warranty.

 

[Killer_B]

Kohler,

This complaint comes up quite often on many makes/models of tractor. My 7610 needs to be "bumped up" periodically as well. I just got in the habit of doing it and don't give it a second thought.

Happy New Year.

KB

 

[Kohler]

What exactly are the hydraulic cylinders? Is this the pump? or in the three point system?

 

[wushaw]

I had a B7500 that did the same thing and I just thought it was normal and would periodiocally bump the 3pt lever up to keep from dragging whatever I was wanting to keep raised.
It did it from the day I bought it.
I put 400hrs on that machine before trading for my L2800 that has position control that does not leak down with engine running or not (which I was suprised at).
Hydraulic fluid is leaking past the piston causing it to leak down and since it does not have position control it will just bleed down to the ground.
Just keep on your dealer to fix it. It's not "suppose" to leak down.

 

[flusher]

I bought my B7510HST/LA302 FEL last May and it has the same droop-down problem with its 3pt. I just close the valve under the seat to hold the 3pt at the height I need for brush hogging. I usually don't have to change the height of the hog while mowing.

When I use the box blade, I open that valve because I'm constantly raising and lowering the implement with the 3pt control lever.

Haven't had a chance to use my Yanmar RS1200 rototiller yet, but I suppose I'll use the box blade approach for this implement.

I agree with you. This fix sucks, but so far it's the only one I've found. I've looked all over these forums during the past 5 months for an alternative fix, but no luck.

 

[Egon]

My B7100 has a chain on the three point that can be used to hold it in one desired position. I seldom do this as I always want the abilty to drop all attachments in a hurry.

Egon

 

[Kohler]

Being an engineer and former technician, as well as a shade tree mechanic, I decided to diagnose the problem more. Since in theory the QIV is properly set and sealed with no leaks, the leak must be in the three point hitch.

But I always question the assumptions.

I decided to raise my 52 in tiller to the max height and lock the QIV control in different positions and observe the results over time. Moving the valve closer to the raise 1/4 inch raise position I observed noticeable improvements with the drop becoming less and less the more I moved it. When it is finally just over halfway between it center rest position and the 1/4" raise position the drop becomes almost negligible, a drop of only a few inches over hours.

Any Kubota technicians out there who can tell me more about the internal design and makeup of the QIV? Are there any internal adjustments or seating surfaces to account for this?

Anyone else have this problem and QIV changed at the dealership? Any results?