B26 3 Point Hitch Broken?

[North Idaho Wolfman]

hmmmm.. from the OP...
...
I’m looking at either a blown seal in the lift arm cylinder, or more likely, a broken part on the lift arm assembly inside the transmission since there is no
(I mean ZERO) resistance up or down.
....

I suspect either '060' that connects '040' to '050' may be broken. mechanically it's the only thing I see that disconnects the lift arms from the ram, thus causing 'ZERO resistance up and down'.
If it was a bad seal ,you should be able to 'feel' SOME resistance on way or maybe both

If the Three point is in the down position, you will have zero resistance up and down as the three point has no down pressure (it floats)

 

[kubotamilt]

If the Three point is in the down position, you will have zero resistance up and down as the three point has no down pressure (it floats)

I realize that now, so I’m a little less concerned, but only slightly. When I picked up hydraulic fluid this morning at the dealer, I felt the 3pts on a few tractors and they felt the same

 

[PoTreeBoy]

OK, your B26 is somewhat kin to my L35. My earlier post was a little off. The L35 has 2 directional valves. One is not even mentioned in the operator manual, since it has no value with a permanent loader.

The other one, however, has to be switched when the backhoe is removed to use the 3PH. When the backhoe is mounted this valve bypasses the flow that would normally go to the 3PH and sends it directly back to the sump. To use the 3PH, this valve is switched to supply it. This is done to prevent 3 pt activity from imposing back pressure on the backhoe tank port (and probably for safety - I'd hate to be on the hoe, reach back for the throttle, and hit the 3 pt lever by mistake). On the L35, this valve is operated by a rod that comes out near the top link.

I don't think the B26 is exactly the same, but it may have something that accomplishes the same thing. My L35 acts the same as yours. I guess i should switch that valve just long enough to see if my lift works.

 

[PoTreeBoy]

This is out of the L35 op manual:

 

[kubotamilt]

Well that’s some great info! I’ll check that tonight too. Hopefully that’s it! Based on everything that’s has been discussed, this seems most likely, as I have looked at everything else. Of course, I could have missed something when I was looking as the linkages, but I’m going to keep my fingers crossed

 

[TheOldHokie]

This is out of the L35 op manual:
View attachment 94214

Well hello!! Do you still need to loop thd outlets together?

Dan

 

[kubotamilt]

I assume you mean connecting the male and female hoses that run the backhoe? I did connect those.

Well hello!! Do you still need to loop thd outlets together?

Dan

 

[kubotamilt]

So, I got a chance to look again. Still nothing jumps out at me. No obvious valve that disables the three point, topped off fluid with about 2 qts of kubota hyd fluid, and linkages look good. I also disconnected the loop while running and tractor bogged down, so I immediately shut it off. But this tells me that fluid is circulating through the loop. Another thing that I didn’t mention though, when raising and lowering the lift arms by hand, there is a clunking sound… anyway, here’s some pictures. Maybe you guys will catch something that I don’t! In one of the pictures, I am pointing to the exact part of the linkage that the position control lever moves

 

[North Idaho Wolfman]

That looks and sounds good.
The "cluck" is normal, the connecting rod is not fixed to the piston, and there is a keeper that keeps it from falling to far out of place.
How about the front knob?
And it's not unheard of for the piston to get "stuck" from long times of non use.
Put the three point position lever in the up position and do some other tasks, WORK it good, at good RPMS you might get lucky and have it break loose.
Otherwise your looking at a little teardown to get it working.

 

[kubotamilt]

That looks and sounds good.
The "cluck" is normal, the connecting rod is not fixed to the piston, and there is a keeper that keeps it from falling to far out of place.
How about the front knob?
And it's not unheard of for the piston to get "stuck" from long times of non use.
Put the three point position lever in the up position and do some other tasks, WORK it good, at good RPMS you might get lucky and have it break loose.
Otherwise your looking at a little teardown to get it working.

I think that’s where we’re at. I can see parts inside the case moving with the linkage, so that really verifies that the linkage is working properly. Opened and closed the drop valve a bunch with the tractor running, no change. So stuck sounds about right. Also, as I mentioned in my first post, From what I can tell, this thing lived with a backhoe on it, so I don’t think the three point has been raised almost for the entire life of the tractor. Any other tips for freeing up the cylinder? Could jarring the lift Arms downward with a dead blow hammer be an option? I can’t imagine that would damage anything. Also, am I correct I. Thinking that a blown seal would likely still produce upward force, just slowly?

 

[North Idaho Wolfman]

I think that’s where we’re at. I can see parts inside the case moving with the linkage, so that really verifies that the linkage is working properly. Opened and closed the drop valve a bunch with the tractor running, no change. So stuck sounds about right. Also, as I mentioned in my first post, From what I can tell, this thing lived with a backhoe on it, so I don’t think the three point has been raised almost for the entire life of the tractor. Any other tips for freeing up the cylinder? Could jarring the lift Arms downward with a dead blow hammer be an option? I can’t imagine that would damage anything. Also, am I correct I. Thinking that a blown seal would likely still produce upward force, just slowly?

Hey it's yours if you wanna smack it go right ahead, I wouldn't.
The piston is very likely aluminum and maybe the connecting rod off the rock shaft.
Yes if the seal was blown it would move it just wouldn't hold weight.
If you can do like I said in the other post, top position on lever, middle position on drop speed, and run it like you stole it for a couple days you might get lucky.

 

[kubotamilt]

Hey it's yours if you wanna smack it go right ahead, I wouldn't.
The piston is very likely aluminum and maybe the connecting rod off the rock shaft.
Yes if the seal was blown it would move it just wouldn't hold weight.
If you can do like I said in the other post, top position on lever, middle position on drop speed, and run it like you stole it for a couple days you might get lucky.

 

[kubotamilt]

Okay, ya I don’t think I’ll be smacking it. I just ran it hard moving piles of snow and ice for about 45 minutes, no change. I’ll continue doing that for now.

perhaps we change gears into discussing the tear down. I looked at it tonight, and it doesn’t look as bad as I thought. It appears that seat pan and fenders need to come off, then a bunch of linkages to give access to the transmission top cover. It looks like the 3 pt. Lift arm assembly should be able to be serviced through that cover.

also, I ran the pto while working the tractor just to try to get some splash lubrication on that lift cylinder. Once I was back at idle with it, it made sort of a groveling sounds. I’ve heard this in other tractors that I’ve run, but one of them was a 48 Case! So I thought nothing of it then….but should a b26 be making that sound? I should mention, it’s not a new noise. I just couldn’t hear it with the revs way up there.

thanks for all the help everyone! It’s encouraging knowing that I have Kubota Kunsultants Unlimited willing to offer some help!

 

[PoTreeBoy]

Well hello!! Do you still need to loop thd outlets together?

Dan

Yes, you still have to loop the hoses together. All the valve does is dump the fluid to the sump ahead of the 3pt control valve.

I may have misled OP. I dont have any manuals for his B26 (if i were him, I'd be getting them), but looking at the parts diagrams, I dont see anything similar on the B26.

 

[TheOldHokie]

Yes, you still have to loop the hoses together. All the valve does is dump the fluid to the sump ahead of the 3pt control valve.

I may have misled OP. I dont have any manuals for his B26 (if i were him, I'd be getting them), but looking at the parts diagrams, I dont see anything similar on the B26.

Manuals would be helpful, I have looked but not found any. For that model.

Dan

 

[TheOldHokie]

Okay, ya I don’t think I’ll be smacking it. I just ran it hard moving piles of snow and ice for about 45 minutes, no change. I’ll continue doing that for now.

perhaps we change gears into discussing the tear down. I looked at it tonight, and it doesn’t look as bad as I thought. It appears that seat pan and fenders need to come off, then a bunch of linkages to give access to the transmission top cover. It looks like the 3 pt. Lift arm assembly should be able to be serviced through that cover.

also, I ran the pto while working the tractor just to try to get some splash lubrication on that lift cylinder. Once I was back at idle with it, it made sort of a groveling sounds. I’ve heard this in other tractors that I’ve run, but one of them was a 48 Case! So I thought nothing of it then….but should a b26 be making that sound? I should mention, it’s not a new noise. I just couldn’t hear it with the revs way up there.

thanks for all the help everyone! It’s encouraging knowing that I have Kubota Kunsultants Unlimited willing to offer some help!

If the circuit is flowing I would suspect the valve or control linkage not the cylinder. Not much to go wrong with the cylinder. Is the feedback linkage in place and properly adjusted?

At this point you really need to get a WSM. It will describe the operation of the system and give you some help with adjustments and diagnostics.

Dan

 

[North Idaho Wolfman]

Okay, ya I don’t think I’ll be smacking it. I just ran it hard moving piles of snow and ice for about 45 minutes, no change. I’ll continue doing that for now.

perhaps we change gears into discussing the tear down. I looked at it tonight, and it doesn’t look as bad as I thought. It appears that seat pan and fenders need to come off, then a bunch of linkages to give access to the transmission top cover. It looks like the 3 pt. Lift arm assembly should be able to be serviced through that cover.

also, I ran the pto while working the tractor just to try to get some splash lubrication on that lift cylinder. Once I was back at idle with it, it made sort of a groveling sounds. I’ve heard this in other tractors that I’ve run, but one of them was a 48 Case! So I thought nothing of it then….but should a b26 be making that sound? I should mention, it’s not a new noise. I just couldn’t hear it with the revs way up there.

thanks for all the help everyone! It’s encouraging knowing that I have Kubota Kunsultants Unlimited willing to offer some help!

The gravel sound could be many things, maybe even as simple as the PTO clutch chattering on shutdown or the strait cut gears?
It could also be a bad bearing, with it off, see if you can turn the PTO shaft ( if you can't that's probably fine, as some PTO clutches have brakes on them) if you can turn it, listen and feel for... well a gravel in the case feel.

Yes pulling it apart is not that hard of a task.

 

[PaulL]

Manuals would be helpful, I have looked but not found any. For that model.

Dan

I have a WSM for a B2601. I can't imagine that the B26 has a different back end. They're pretty easy to find online - such as https://kubotarepairmanual.com/wp-content/uploads/2019/12/B2301.pdf

Page 279 has this (in section 7: Hydraulic System):

From about page 288 there's a bunch of information on disassembling the 3ph pump.

Ugh, I just saw that the link I gave above isn't the full manual. I did find a full manual online, that's where I got mine. I'll send you a private message.

 

[North Idaho Wolfman]

I have a WSM for a B2601. I can't imagine that the B26 has a different back end.

They are set up slightly different and have some parts that are diffent.

 

[PaulL]

Ugh. So need a B26 WSM then. Nonetheless, the manual I have probably gives a fair idea of what's involved.