BX23S Backhoe Broken Lever Fulcrum - Is it a shear pin?

[Chrisicle]

I have a BX23S and whilst using the backhoe, one of the long control sticks started to flop around. Took it to bits and found that the lever frustrum, if that is the correct part, had snapped in half. The weird thing is, it looks like a shear pin, because there is a very distinct, straight line in the middle of the bolt.

Is this really a shear pin?

I am contemplating disassembly and welding, but obviously do not want to do this, if it is a shear pin.

Does anyone know for sure?

 

[TheOldHokie]

I have a BX23S and whilst using the backhoe, one of the long control sticks started to flop around. Took it to bits and found that the lever frustrum, if that is the correct part, had snapped in half. The weird thing is, it looks like a shear pin, because there is a very distinct, straight line in the middle of the bolt.

Is this really a shear pin?

I am contemplating disassembly and welding, but obviously do not want to do this, if it is a shear pin.

Does anyone know for sure?

View attachment 125466 View attachment 125467

The fulcrum shaft has broken in half. A new fulcrum is a whopping $19.

Kubota #7K530-71112 LEVER, FULCRUM

LEVER, FULCRUM

www.messicks.com

Dan

 

[Chrisicle]

The fulcrum shaft has broken in half. A new fulcrum is a whopping $19.

Kubota #7K530-71112 LEVER, FULCRUM

LEVER, FULCRUM

www.messicks.com

Dan

Cheers for the response Dan. Not sure this is 19$ in Canada with shipping. Kubota seems to have the part listed 100+ CAD which is why I was thinking of just welding it. Just not sure on the Sheer Pin design question.

 

[GreensvilleJay]

7K53071113 is a $32.75, well $32 anyway....
I though about welding it but pin at base needs to be smooth for bearing to spin.
and....Local dealer( 7 minutes away ) had in stock.
If you do spend the hour to gut/grind/reweld you'll lose a bit of length and it may be too tight to spin freely !

Reminds me I need to spray more thick rustcheck on all the moving parts......
Also be SURE it's not too tight !
AND.... don't lose the 'sleeve' ,#140 or else it's another $10 ! My original is 'somewhere' out in the front flower garden, didn't see it slip out...
Yes, Local dealer( 7 minutes away ) had in stock, too ! hmm.......

 

[DustyRusty]

While you are at the local dealer, check with the service manager to see if there might be an upgraded part or a warranty replacement for the part. It is a long shot, but you never know, if enough of them break, then Kubota might do a silent warranty replacement of the part with the customer paying for the labor.

 

[TheOldHokie]

Cheers for the response Dan. Not sure this is 19$ in Canada with shipping. Kubota seems to have the part listed 100+ CAD which is why I was thinking of just welding it. Just not sure on the Sheer Pin design question.

There is no shear pin.

Dan

 

[Chrisicle]

There is no shear pin.

Dan

Thanks Dan, the way this pin broke looks like a defect,.. can't think how this break could happen naturally. I think I'll take RustyDusty's advice and see if there is any type of silent recall going on,.

Thanks folks

 

[hagrid]

Reverse bending failure.

 

[Chrisicle]

Reverse bending failure.

Thank you definitely reverse bending fatigue; just pulled a study on it showing how cracks start to form on each side, working their way in, until the center cannot hold any more and snaps off, leaving the center in this defined shape. There are many other patterns for difference scenarios, which is interesting. Did not know this was a thing.

Surprised that such fatigue could come from a joystick. The previous owner of this little machine must have been really working it.

Cheers man

 

[GreensvilleJay]

Mine died similar way, you could see the rust ribbon on it until I started to repair it. when I called dealer and it was in stock...10 minutes later I had the new one.
Just found my busted one. The shaft is ground down to fit into a hole on the 'bent' lever piece. It broke off at the joint,where inner bearing sits, still pondering as to HOW it failed. Though my current idea is that the bolt on the end is too tight and binds the shaft so when you rotate the lever it breaks.course if the bolt isn't tight, it'll fall out....
Both mine have maybe 1/16" free 'end play'.

 

[Chrisicle]

Mine died similar way, you could see the rust ribbon on it until I started to repair it. when I called dealer and it was in stock...10 minutes later I had the new one.
Just found my busted one. The shaft is ground down to fit into a hole on the 'bent' lever piece. It broke off at the joint,where inner bearing sits, still pondering as to HOW it failed. Though my current idea is that the bolt on the end is too tight and binds the shaft so when you rotate the lever it breaks.course if the bolt isn't tight, it'll fall out....
Both mine have maybe 1/16" free 'end play'.

Yes notice my good one (hopefully) has similar play. Wonder if there is a way that a jolt from the backhoe can make its way back? Can't think of one

 

[GreensvilleJay]

You WANT the 'play' ! The shaft should rotate on the bearings AND move 'in/out' a bit. If the big washer is tight against the frame, the shaft won't rotate. There's a spacer/shim between the two bearings. it may be the gap isn't the same for all backhoes.A mm too short and the shaft will bind. I'd have to tear mine apart to see 'how-it-works'. The big washer keeps the unit from sliding back.

 

[Soopitup]

This seems to be a failure point for these.
When I rented a 23S several years ago I had one of these come loose. Spent an hour or so digging into it, figuring out what happened, and finding the missing parts. Fortunately nothing fell into the dirt.