We have a Kioti CK30HST with a KB2375 backhoe. The other day, the bottom pin for the boom fell out, and lots of damage occurred. Right/left swing hydraulic pistons busted (and have since been repaired), but the current damage is the bent upper pin.
I'm looking for some advice as to how to repair this. I have a sledge hammer.
but not sure that's the right approach. One thought I had was to heat up the top portion and then give it some gentle whacks. Another thought would be to simply cut off the bent portions, have new ones made or straighten out the cut off pieces, and then weld the parts back on.
Would love to hear other thoughts. Thank you!!!
Helloworld88,
First response. OUCH, this is going to be tough to fix and probably expensive.
Before doing anything, ask your local Kioti dealer if they have had similar experience and what fix is.
Ask your local car body repair shop their opinion on fixing this. They usually have experience and tools for straightening bent car frames.
I don't see a location for your profile so you may or may not have these two options:
If you live near an implement fabricator then they might be able to help since they have tools and skills to bend heavy metal.
Lastly, if you live near a heavy equipment repair shop, they repair excavators, bucket loaders, and large backhoes that tear up their buckets, dippers, lift arms, etc
If the above does not provide any solutions then I suggest the following two routes since the lower plate does not appear bent;
First choice since upper and lower plates are clearly welded to a common point.
Cut the upper plate off machine, ahead of the reinforcement between upper and lower plates, since it is already damaged. This will allow you to remove backhoe and gives you workspace to properly fix damage.
You may now be able to flatten the lower plate using hydraulic press ( preferred method ) but be careful not to work too near the pin bore otherwise you may elongate the bore OR you may have to have a new plate fabricated including pin bore ( which will not be fun ).
Have your local metal yard fabricate a second plate to stack on top of flattened plate but with overly large hole where pin passes through. Second plate is to reinforce plate directly below it since upper plate is what takes all the load when trying to curl bucket down into ground.
Place a new straight pin in existing lower plate and place upper flattened plate onto pin with temporary blocking between upper and lower plate to hold correct spacing dimension before welding and during welding. Welding heat is going to try to bend/twist the upper plate. Measure and check alignment many times and then tack weld. Recheck dims and make sure pin isn't being twisted in upper/ lower bores and then fully weld. Allow to cool with clamps on.
Remove clamps and add reinforcement plate to upper now welded plate. Reclamp and tack, recheck pin for binding again. Fully weld.
Second choice since you could damage the lower plate by working on upper plate
First you need to get the backhoe off the machine to give yourself room to work and you don't damage something else while bending, banging, and heating. Can you clamp the upper and lower together to release the pivot pin with really beefy C clamp or a hydraulic clamp?
After backhoe off machine then put the pivot pin back into the hole to keep upper and lower bore aligned.
Here is where going gets tough. If you try to bend the upper plate down by clamping the upper and lower then you may end up bending both plates. If you heat the upper plate to bend it down, you need to make certain you don't twist it otherwise the upper and lower bores won't line up.
Good luck on your fix.
