B6100 3-pt falls slow

[nostep]

I have a B6100 and since becoming the owner (3 years ago) I've noticed that the 3-pt lift falls slowly. Sometimes more than slowly. Does that sound more like the valve, or the lift cylinder? How much headache for a novice Kubota repair person?

 

[Oldtractorfixer]

Most tractors have any adjustment for the speed at which it falls. It is called draft control on some. On my B7510 it is a knob facing forward near the floor below the front of the seat. If you turn it too much it is very slow. Are you sure you didn't accidentially adjust something?

 

[KubotainNH]

It probably needs the seal replaced on the piston under the seat. Mine drops too after awhile. These tractors are 30+ years old, the seals get tired. I'm pretty sure there's some posts on here about it if you do search.

 

[Notforhire]

I have a B6100 and since becoming the owner (3 years ago) I've noticed that the 3-pt lift falls slowly. Sometimes more than slowly. Does that sound more like the valve, or the lift cylinder? How much headache for a novice Kubota repair person?

Do you mean that it lowers by itself, when the tractor isn't running, or it is slow when you try to lower it?

 

[nostep]

Falls by itself. Just trying to get good guess on if it's the piston or the valve.

Thanks both

 

[KubotainNH]

O-ring on piston is my bet. http://www.tractorbynet.com/forums/parts-repairs/88048-repair-kubota-b7100-dropping-3pt.html

 

[nostep]

Sorry it took me so long to get back here. Busy summer. Anyway, I pulled the top off the cylinder just like the notes above showed. Real easy. I didn't have a magnet, but I got the piston out by slamming the lift arms down a bunch of times. Each time, the piston came out about 1/4" inch. I have to wait for the o-ring (plus the plastic dirt ring) to come in. Not expecting any trouble from here. Thanks all.

 

[KubotainNH]

Good deal.

 

[nostep]

OK, replacement of o-ring (plus backup ring) went smoothly. 3-pt still feel all the way down over a several hour period. Any tips on what to try next?

Thanks.

 

[KubotainNH]

Did the cylinder look good and smooth? No bad areas to allow seepage? If all is good then the only thing left is the valve itself unless the 3pt/aux valve is the culprit but if it is capped like mine then it can't be that. You can see in the attached picture what is in the control valve.

 

[nostep]

Roger, no aux valve. Cylinder looked really good. I'll just wait till I get some time on it to see if it settles in. That won't happen till we get some snow. Thanks.

 

[Lodur]

Hi,
I did this exercise this summer with one exeption: I do not have the plastic ring on my lift cylinder. Also - it was not possible to get it out just by lifting the 3P arms...Anyway - today it is much better. But it will still slide if I have the counter weight attached.
I talked to my neighbour he has a huge assortments of commercial tractors, and I trust him much:
Any tractor will randomly have a set of cylinders/packacing system (Orings) and as long as there is no external oil leak he never cares. So I leave it like it is now. It drops down with the weight on maybe in 4 hours operation. I can live with this. As was written before - it is a 30+ year old machine.
Just my 2 cents opininion.

 

[KubotainNH]

Roger, no aux valve. Cylinder looked really good. I'll just wait till I get some time on it to see if it settles in. That won't happen till we get some snow. Thanks.

It should have one, it's the knob under the seat. All it does is send the 3ph pressure out a nearby plugged hole. Here's a picture of it in the 1st post: http://www.tractorbynet.com/forums/kubota-owning-operating/138244-mystery-knob-valve-b7100.html
My tractor has a chain setup on the back that will limit how low the hitch will drop. You just drop a link into the forked thing that holds it up. I ignore the hydraulic drop because that chain keeps it to a minimum.