Backhoe BH77 broke - defective part?

[boggen]

could be multi things. regardless for now need new pin.

pull the 2 cylinders apart. and double check inside diameter of each cylinder. by just putting the pin in. and see if it wiggles around some. if it wiggles to much. you might have found the problem.

beyond that, the frame would need to flex.

to me there seems like a good amount of spacing, and looks like washers are missing between cylinders and frame mount. but not a mechanic by no means. 555c TLB i have, everything fits fairly tight, exception of wear and tear of holes in the frame and pin wear.

 

[nspec]

I haven't seen a new one, but it sure looks to me like the frame is bent. Looks like it is tweaked out on both sides. Seems to me that it all should fit up pretty close with nowhere near that much space. Looks like the frame needs some strengthening in that area.

I would absolutely insist on a new unit. Keep working your way up the corporate ladder until you get results. Your dealer should be working on your behalf. That sort of damage to me is absolutely inexcuseable. It would certainly seem to me that it would be in Kubota's interest to remedy this situation. If not, I would think you could fight it in court and win pretty easily.

 

[Berniep]

Move the cylinders out of the way and the new pin should fairly easily slide in.
If they are bent at all the holes wont be pointing at each other.

 

[Texas Fella]

I did not read through all of these, so sorry if I am repeating what some one else said. It is very unlikely that this is a case of bad pins. Some one said something to the effect that if 2 of them did it, then it must be an issue. Kubota makes 10s of thousands of backhoes, 2 (or even 20) is not an epidemic. Ususally, what causes pins like that to break is that they sit on the dealers lot and the pin gets seized in the bushings. When the back hoe is used, the pin does not rotate fully and thus snaps off. If you already have one, keep it greased. Every time I post on here someone argues with me and all but tells me I am stupid, however, I really do happen to have a little knowledge in the this field and this is usually how these pins break, not to say that it always happens that way. Hope this helps.

 

[broken kubota]

TwinCam88 this is not pointed at you:
I have to throw the BS card on the link posted to the broken bh77.
Look at the wear on the bucket. There is no way you can wear the paint off a Kubota bucket in 3 hours of use.
Then look at picture of the 3200 in his heated garage. That picture is PhotoShopped:ashamed:.

Hi all,
Just reading around to see if anyone else had the Bad Bh77 problem and I see the anwser is yes:laughing:. Well the pictures are not photo shopped or fake in any way. Kubota is aware that they have a problem.
I got my boom replaced and both cylinders also replaced along with my pin and gess what The pin broke a second time after about 1 hour into digging out a very small and rotted stump. Just like the Bh 77 that broke in this topic,very light digging had not even got to the point of wiggling the stump. My damage is not as severe because when the pin snapped it made a metalic pop sound and at that point I stopped digging and inspected the pin and discovered the fracture. At this point I am still waiting for kubota to contact me with a answer to the question of: What are you going to do? I dont really want a backhoe I have to dig in sand with:laughing:WTF Kubota.
ps. the spreading and or twisting of the ears on the backhoe is from pulling back the boom with half a pin in the boom(half that is bolted stays in other half falls out ) this makes the ears spread or twist depending on bucket load.

 

[Texas Fella]

It really suprises me how many people spend that much money on a BH to just "dig in sand."

 

[wdchyd]

I did not read through all of these, so sorry if I am repeating what some one else said. It is very unlikely that this is a case of bad pins. Some one said something to the effect that if 2 of them did it, then it must be an issue. Kubota makes 10s of thousands of backhoes, 2 (or even 20) is not an epidemic. Ususally, what causes pins like that to break is that they sit on the dealers lot and the pin gets seized in the bushings. When the back hoe is used, the pin does not rotate fully and thus snaps off. If you already have one, keep it greased. Every time I post on here someone argues with me and all but tells me I am stupid, however, I really do happen to have a little knowledge in the this field and this is usually how these pins break, not to say that it always happens that way. Hope this helps.

If you " do happen to have a little knowledge in the this field" then you'd know that steel has two strengths....Yield (bending) and Tensile (snapping)....

Steel is has it's limitations and to exceed these limits will provide anybody with failure in a given situation.....

To say that these units have "Rusted in place" and snapped because of it is completely false.....(IMHO)......These are NEW backhoes....

A snapped pin (exceeding the tensile strength) will bend ears and pin bosses everytime.....Yes it can start with a broken pin.....maybe the pin bends first (yield strength), I don't know....

My reply to you is not in an argument fashion and I'm not implying that you or anyone else is stupid, just stating the facts as I see them.....If I'm wrong please tell me so.....

 

[wdchyd]

Hi all,
Just reading around to see if anyone else had the Bad Bh77 problem and I see the anwser is yes:laughing:. Well the pictures are not photo shopped or fake in any way. Kubota is aware that they have a problem.
I got my boom replaced and both cylinders also replaced along with my pin and gess what The pin broke a second time after about 1 hour into digging out a very small and rotted stump. Just like the Bh 77 that broke in this topic,very light digging had not even got to the point of wiggling the stump. My damage is not as severe because when the pin snapped it made a metalic pop sound and at that point I stopped digging and inspected the pin and discovered the fracture. At this point I am still waiting for kubota to contact me with a answer to the question of: What are you going to do? I dont really want a backhoe I have to dig in sand with:laughing:WTF Kubota.
ps. the spreading and or twisting of the ears on the backhoe is from pulling back the boom with half a pin in the boom(half that is bolted stays in other half falls out ) this makes the ears spread or twist depending on bucket load.

Welcome to TBN...:welcome:......Sorry to meet this way but we always enjoy anything to add...

 

[wdchyd]

Ahhhh, you're the guy from post #4.....:thumbsup:

 

[dodge man]

I don't know anything about backhoes, but if a pin had a little grease on it from the factory, I'd think it would have to sit around for years before it would rust enough to freeze the pin and cause it to fail during its first use.

 

[Texas Fella]

You guys who have call my post into question are correct, 99.9% of the time. Had a good friend that I grew up with who now works at a dealership (not a Kubota one) who was telling me that some time, when things don't go right at the factory (no grease on the pin) that a pin can corrode and get stuck in the bore. Backhoes are not very fast moving items (at least at his dealership) and he says that they often time sit in the crate or on the lot in the same postition for an extended peroid of time. I will say that I looked at the pictures (missed them the first time) and in my humble opinion, the pin did not look like it was froze in the bore in this case. Anyway, sorry for any confusion from my post.

 

[Texas Fella]

Oh I forgot to add something. After see the pictures, the metal to me looks very crystalized in the center of the broken pin. Althought this in and of it self may not mean anything, it could point to a material defect. Again, just my opinion.

 

[Tompet]

Here's some pics of the defective/broken pin. I've contacted the dealer that I purchased the tractor from and they are sending me another pin for it. I'm just a little worried that this may be a bigger issue than just replacing the pin now. It looks to me like it may have actually bent the frame that holds the cylinder...maybe torqued/pushed it out a little (see pic 3). Not sure how I'd get this pulled back in. I'm also concerned that it may have damaged the inside of the pin sleeve...perhaps scuffed it which could lead to additional wear later?

Feeling pretty sick about this right now...

I would be sick as well. It looks like it has bent. Replacing the pin is a temporary fix at best. Best of luck in getting this sorted out. Keep posting.
I was unaware of the that particular design difference between the 77BH and the 76BH.
Boy, I don't know, I was just in process of ordering a BH77! That is a concern!

 

[nspec]

After see the pictures, the metal to me looks very crystalized in the center of the broken pin.

I thought it was just me. I've never seen the inside of one of these pins before, but that doesnt look right to me. I would think it should look like a solid piece of steel which has been cut, not like a broken piece of cast steel.

 

[grsthegreat]

TwinCam88 this is not pointed at you:
I have to throw the BS card on the link posted to the broken bh77.
Look at the wear on the bucket. There is no way you can wear the paint off a Kubota bucket in 3 hours of use.
Then look at picture of the 3200 in his heated garage. That picture is PhotoShopped:ashamed:.

i dont see any indications of photoshopping it. Ive seen brand new buckets look like that in a few hours of digging. the machine looks cherry.

I sure hope Kubota owes up to the repairs.

 

[wdchyd]

I thought it was just me. I've never seen the inside of one of these pins before, but that doesnt look right to me. I would think it should look like a solid piece of steel which has been cut, not like a broken piece of cast steel.

When a hardened pin or shaft breaks this is typical.....

The pin in question from the OP'r shows it was hardened (the outer layer is finer grain).......

Here's a pic of a 1.750 dia hardened hyd rod that snapped in one clean shot from todays machine work......notice the hardening in the outside approx 1/8 thick.....

This comes from an OEM CAT skidder hyd rod.....in the background you can see the finished rod installed....

 

[dodge man]

Texas Fella, I'm not questioning your knowledge, I just noticed in the photos is looked like the joint was greased and it looks like the pin just broke in half. If dealers are sending backhoes out with frozen joints, I would say that is poor prep, they should grease the pins and make sure they are free before it sold.

To the OP, I saw your post where you got your brand new machine a few days ago, and it has to be a bit of a let down to have it broken so soon. I hope it all gets resolved and you are happy with the machine.

 

[SixHoeBob]

Hi all,
Just reading around to see if anyone else had the Bad Bh77 problem and I see the anwser is yes:laughing:. Well the pictures are not photo shopped or fake in any way. Kubota is aware that they have a problem.
I got my boom replaced and both cylinders also replaced along with my pin and gess what The pin broke a second time after about 1 hour into digging out a very small and rotted stump. Just like the Bh 77 that broke in this topic,very light digging had not even got to the point of wiggling the stump. My damage is not as severe because when the pin snapped it made a metalic pop sound and at that point I stopped digging and inspected the pin and discovered the fracture. At this point I am still waiting for kubota to contact me with a answer to the question of: What are you going to do? I dont really want a backhoe I have to dig in sand with:laughing:WTF Kubota.
ps. the spreading and or twisting of the ears on the backhoe is from pulling back the boom with half a pin in the boom(half that is bolted stays in other half falls out ) this makes the ears spread or twist depending on bucket load.

I would not even fool around with these backhoes. I would return them to the dealer's lot and then demand my money back. I would use the word attorney freely if required. The pin is too small for the application, If Kubota has a clearly corrected backhoe, I would consider buying it. The pin needs to be of a larger diameter. The the cylinder ends need to be larger so that the new larger pin holes do not break off of the cylinder end.

Once the warranty runs out, the owner will be paying the repair bill every time the hoe self destructs.

As long as the operator is not deliberately pounding or twisting, the backhoe should not break.

 

[Texas Fella]

Really, demand your money back? What have we come to in this society when a major manufacturer can not make a mistake with out having to take back it's product. Do not get me wrong, Kubota should take care of these issues ASAP, and at no charge to the customer. You paid for a functioning product, and you should get one. However, there is no proof that it is an undersized pin. In fact, based on our information here on TBN, nothing is fir sure. If the manufacture screwed up, give them a chance to make it right. If we (as a society) keep up with this "walmart" mentallity of "something on it broke, I want my money back" then ALL corporations and small business will have to charge so much for their products that we will not be able to afford them. Just my 2 cents, take it or leave it.

 

[wdchyd]

Really, demand your money back? What have we come to in this society when a major manufacturer can not make a mistake with out having to take back it's product. Do not get me wrong, Kubota should take care of these issues ASAP, and at no charge to the customer. You paid for a functioning product, and you should get one. However, there is no proof that it is an undersized pin. In fact, based on our information here on TBN, nothing is fir sure. If the manufacture screwed up, give them a chance to make it right. If we (as a society) keep up with this "walmart" mentallity of "something on it broke, I want my money back" then ALL corporations and small business will have to charge so much for their products that we will not be able to afford them. Just my 2 cents, take it or leave it.

I see from your profile Texas Fella that being a Service Manager at a Large Tractor Dealership puts a lot of pressure on you and your crew to find fault on someone else other than the "Corporation" for making a product that doesn't withstand the normal duty that it was sold for.....