Backhoe Cracked Transmission case between bolts attaching backhoe

[airbiscuit]

.......
As a new owner, I believe I have been cautious and conservative in operating the tractor. That said, as a new owner, I may not know what "normal" operating parameters are and that what I am doing shouldn't be done and could lead to the problems I am experiencing. Please allow me to explain and seek your thoughts. My use has entailed digging up stumps, many ditches, some retaining wall work, and leveling a place for a garage. North Idaho is replete with rock outcroppings so I have chipped away at some rock though I have been careful not to drop the bucket to turn it into a hammer. A lot of my backhoe work has been at an angle to the long axis of the tractor and, in some tight places, I have done some trenching at nearly 90 degrees to the long axis. Would working at an angle to the long axis tend to torque the backhoe and hence the mounting brackets that the mounting rails slide into? Are the stabilizer arms designed to prevent this torquing? Should I be careful to dig only within a ten or twenty degree range of the long axis of the tractor and use the additional pivot range only for dumping the bucket? I haven't been able to find any limit to the range of operation in the manual. Is there such a limit ... explicit or implicit?

Hey MossRoad, thanks for the welcome and the caution. Please jump on me if I seem to be straying. As you point out, ignorance sure won't be bliss.

Again, thanks to you all for taking your time to help me.

There may be some clues here. Stumps are evil

 

[MinnesotaEric]

Probably for the same reason you put lame music on your video's......:laughing:

Got it: you don't listen to music on the radio and you're a riot at parties.

 

[MinnesotaEric]

I'd like to see the OP in action. 75% of me thinks it would be okay. 25% of me wonders if he beats the $h*t out of it. I repeat, stumps are evil.

A properly mounted backhoe should not crack the transmission. Moreover, even assuming the operator is beating the snot out of the hoe, then I expect the pins to take that beating if the subframe is properly distributing the load and not crack the transmission. This sounds like a design error that should be rectified.

 

[airbiscuit]

I generally agree with whatever MinnesotaEric has to say. I have to admit however, that I am a little queasy thinking it would be okay to beat the snot out of a backhoe and not worry that you might damage your CUT.

 

[rademamj1]

I sure hope were not looking at a Kioti design flaw for the Backhoe mount. I have spent well over an hour running searches on Kioti backhoe and cracked transmission cases, and almost all search results reference this very thread. I did find in 2014, a discussion on issues with cracks in the forward subframe, associated with welds. But nothing much on cracks in transmission cases.

I have the CK4010 tractor with backhoe and am concerned about systemic problems with the backhoe mounting.

 

[JoelD]

I’m also with Eric. A properly designed machine should not break at mounting points. Pins are wear items and from my experience are expected to fail / wear with time and use.

Hydraulic bypass valves are designed to limit power and damage.

If using outriggers and proper hydraulic pressure you should not in theory have problems.

The exception I can think of is driving around carrying something with the hoe. Then all bets are off.

I’ve dug at stumps for days and never had a problem other than worn pins.

No question there’s a night and day difference between digging stumps with a SCUT vs the smallest of excavators. Very different purpose built machines but with that said a SCUT with a factory hoe should be able to dig for days without issues. No different than doing loader work or implement work all day.

Joel

 

[5030]

Got it: you don't listen to music on the radio and you're a riot at parties.

I'm deaf....lol

 

[The Fred]

I'm deaf....lol

Kenny Chesney- She Thinks My Tractor's Sexy - YouTube


You're listening to the wrong music.

 

[ON84]

My guess is that excessive down pressure on the sub frame was the probable cause. (failure to engage the stabilizers)
I think that Kioti is amazing for covering this damage under warranty!
We've put about 700 hours on our KB2385 backhoe to dig up hundreds of stumps and rocks. Some tree stumps were almost 2 feet in diameter, and some rocks were over 2 ton.
We cracked the sub frame and had to get it welded. We cracked the main backhoe frame, and had to get it welded. We even broke the main boom cylinder twice and had to get it welded. We never had any issue with the tractor.

 

[fried1765]

My guess is that excessive down pressure on the sub frame was the probable cause. (failure to engage the stabilizers)
I think that Kioti is amazing for covering this damage under warranty!
We've put about 700 hours on our KB2385 backhoe to dig up hundreds of stumps and rocks. Some tree stumps were almost 2 feet in diameter, and some rocks were over 2 ton.
We cracked the sub frame and had to get it welded. We cracked the main backhoe frame, and had to get it welded. We even broke the main boom cylinder twice and had to get it welded. We never had any issue with the tractor.

With that sort of history, it would seem quite obvious that you are using your machine for work outside it's design parameters (abusing!).