Backhoe Cracked Transmission case between bolts attaching backhoe

[fried1765]

I hate to say it, but it's time to label that tractor a turd, and send it down the road!!

It's one of those things called, "a learning experience"!

SR

^^^^^^+1

 

[JoelD]

For what it is worth. I’ve beaten the snot out of my backhoe on boulders and stumps and also used a thumb to lift said boulders and stumps. I’ve bent bucket edges. Other than pin wear and cyl. Leaks I’m no worse for wear.

I can’t see how a factory hoe should have your problems. If you stepped up system pressure then all bets are off.

Otherwise nothing should break in the machine unless your doing something crazy

 

[finn1]

Sell the tractor and replace I with a piece of quality construction equipment designed from the start as a backhoe.

It’s going to cost you at least double, and maybe as much as four time what your light duty ag equipment with an add on backhoe did, but it will be much more durable for the work you are doing.

There is a reason the major equipment manufacturers make dedicated construction equipment for the work you are attempting and you rarely see modified farm equipment on real construction sites.

 

[blue1jassid]

The tractor/backhoe system remains "stock" in all regards with the exception of the two additional bolts Kioti had the local dealer add to the backhoe mounting bracket attached to the transmission case. I have added an additional hydraulic line to support a rock grapple in place of the FEL bucket but this has nothing to do with the backhoe mounted to the transmission case problem. Kioti offers a fixed thumb for their backhoe now. I would like to add a Michigan Iron hydraulic thumb. Any thoughts on how Kioti might view that the next time the transmission case gives way?
Blue Jassid

 

[MinnesotaEric]

The tractor/backhoe system remains "stock" in all regards with the exception of the two additional bolts Kioti had the local dealer add to the backhoe mounting bracket attached to the transmission case. I have added an additional hydraulic line to support a rock grapple in place of the FEL bucket but this has nothing to do with the backhoe mounted to the transmission case problem. Kioti offers a fixed thumb for their backhoe now. I would like to add a Michigan Iron hydraulic thumb. Any thoughts on how Kioti might view that the next time the transmission case gives way?
Blue Jassid

Without seeing how the factory subframe works, I would seriously work a deal where Kioti agrees to continue to back you and you fabricate a stronger bracket and attaches to the axle as well as runs forward to the loader's rear supports to better distribute the load. Also, I'd back out one of those transmission bolts, and probe down into the hold how far the threads go and if that shows there is more "meat" to bolt into, then get longer bolts. Moreover, if there is no love from Kioti, can the bolts be made into your sacrificial parts where the bolts break off rather than cracking and shelling your transmission case?

I'm making these suggestions because it seems Kioti is reaching for the definition of insanity expecting a different result. There is no good reason a properly designed mounting system should be cracking the transmission case even if all you do is try to move the immovable rock all day long because the pins are your wear points.

 

[SGreene]

I'd back out one of those transmission bolts, and probe down into the hold how far the threads go and if that shows there is more "meat" to bolt into, then get longer bolts.

Ya Eric, you'd have to go back thru my original post (link to my original write up is in post #23. It explains everything.). I have gone through all of the boss and bolt dimensions and done just that.

Blue Jassid, I'm almost positive the MIE hydraulic thumb will not interfere with the Kioti warranty since MIE is a Kioti dealer and up-sells their proprietary hydraulic thumb systems on new warrantied tractors all the time. Call Bob in parts if you'd like to verify tho. When you get a chance will you send me a picture of the extra pair of bolt holes your dealer put on tractor please? I'm curious. The only thing I've done is increase the size of the 4 bosses around the PTO cover.

 

[finn1]

Actually, Eric brings up a good point....are you sure the fractures in question aren’t caused by bolts that are too long for the application and bottoming in the holes? That situation would potentially lead to joint failure.

I have seen it in other highly loaded joints.

Remember, the backhoe is installed at the dealership, not the factory.

 

[airbiscuit]

I hope to see this mystery solved. If the OP has such a delicate touch and this keeps failing, there should be a gazillion hits about this issue on TBN and Google. Maybe it's just a one off? Maybe the OP forgets to use the outriggers sometimes? Maybe the design is flawed and nobody else complains about it? Maybe ... ????

No matter what, inquiring minds want to know what really happened here.

 

[Diggin It]

^^ I've been trying to cut back a bit on posting, reading more threads than replying to. I've read this one several times and I still can't accept that a high stress implement like a backhoe would be attached to anything other than the solid frame. We've seen numerous threads about the perils of three point backhoes and I'm not sure this is much different. It just sounds like an exceptionally poor design. My BH doesn't touch the transmission case at all, let alone being bolted into it.

I might have been looking into my state's consumer protection laws by now.

 

[countrybumpkin]

The tractor/backhoe system remains "stock" in all regards with the exception of the two additional bolts Kioti had the local dealer add to the backhoe mounting bracket attached to the transmission
Blue Jassid

Curios if you have pics or know what bolts were added? This could be something others may want to look into.

 

[SGreene]

Actually, Eric brings up a good point....are you sure the fractures in question aren’t caused by bolts that are too long for the application and bottoming in the holes? That situation would potentially lead to joint failure.

I have seen it in other highly loaded joints.

Remember, the backhoe is installed at the dealership, not the factory.

ffs, you guys are posting without reading the original description providing the whole situation and analysis found linked in post #23.

 

[finn1]

Linked posts aren’t very effective, but yes, bolts that are too short, giving inadequate thread engagement will destroy the casting. The installer should catch this, though, if he has any mechanical aptitude at all.

Bolts that are too long have a similar end result, as there is potentially no clamp load or bolt stretch. Bolt stretch and spring rate is what holds the parts together.

ffs, you guys are posting without reading the original description providing the whole situation and analysis found linked in post #23.

 

[kbforester]

I know this post is old. I've been looking around for anyone who's had a similar issue I just had. Not the same, but sheared of housing where the top link attached. Pushing snow with a box blade. Hit a frozen bank. N4510

 

[toxicjeeper]

Dang that sucks..do you have warrenty still?

 

[kbforester]

Dang that sucks..do you have warrenty still?

Nope. But I'm waiting on my insurance company. Not holding my breath. I don't really know what to expect for this kind of claim.

 

[toxicjeeper]

This worries me cause my brand new NS 5310 looks to be the same axle baack there..what year and model tractor is yours? Here's hoping the home owners insurance covers it otherwise what's the point of paying insurance on a tractor! Unless it just fire and theft..

 

[tacticalturnip]

This worries me cause my brand new NS 5310 looks to be the same axle baack there..what year and model tractor is yours? Here's hoping the home owners insurance covers it otherwise what's the point of paying insurance on a tractor! Unless it just fire and theft..

I don't think such a break is common.

@kbforester can you describe what happened with any more detail? That's one hell of a break, I've never seen one quite like it.

 

[MinnesotaEric]

I know this post is old. I've been looking around for anyone who's had a similar issue I just had. Not the same, but sheared of housing where the top link attached. Pushing snow with a box blade. Hit a frozen bank. N4510

Ouch. You need a trip edge on that blade!

 

[tacticalturnip]

Ouch. You need a trip edge on that blade!

Is that available with a box blade?

 

[MinnesotaEric]

Is that available with a box blade?

No. Every proper snowblow has a provision for tripping because immovable stuff gets covered by snow and you cannot see it. Sort of like brush cutting a field with tall grass and the landowner assures you there is nothing in the field—except for that pile of cinder blocks, the old car parts, the old bottom hoe, and so on.