Frame break Komatsu PC 110R

[Welder Dave]

Yes it looks really good and very impressive. Can't tell if it was hot MIG welded or Metal-core but was done by an experienced welder. Normally I wouldn't use MIG for such a repair but it was done at high amps to ensure good penetration and no lack of fusion. Great job pulling it back together! Stress relieving would be nice but peening needs to be done when the welds are still hot. Done after cooling can add stress. I think you'll be good though. You added a lot of reinforcement. I can't see the machine pulling itself apart again. I'm still thinking the steel may have had a defect for it to break in the first place. Excellent repair job!

 

[cat951b]

Nice job! Is there any way to stress-relieve the welds? Maybe peening with an air hammer?

Thanks. Yes, I de-stressed it with a jackhammer after welding.

 

[cat951b]

Yes it looks really good and very impressive. Can't tell if it was hot MIG welded or Metal-core but was done by an experienced welder. Normally I wouldn't use MIG for such a repair but it was done at high amps to ensure good penetration and no lack of fusion. Great job pulling it back together! Stress relieving would be nice but peening needs to be done when the welds are still hot. Done after cooling can add stress. I think you'll be good though. You added a lot of reinforcement. I can't see the machine pulling itself apart again. I'm still thinking the steel may have had a defect for it to break in the first place. Excellent repair job!

Hi Dave,
Thanks. Yes, after welding I de-stressed with an air hammer as you recommended.
I welded it with MIG
Hopefully it won't break again here. A crane truck will arrive today and we will reinstall the boom and cab.

 

[cat951b]

A couple of photos of the painted state. As new, it was still new.

 

[Welder Dave]

If you peened it while hot is good but I didn't notice any peening marks. Regardless it looks very professional.

 

[cat951b]

If you zoom in, you can see the trace of the flattening on both sides of the weld.

 

[Shimmy1]

Wow. I've seen some pretty good repair jobs over the years here on HEF, and until now that draft ball repair on a grader was at the top of my list. This has just surpassed it. The amount of effort to completely dismantle the machine to get to this is frightening.

Well done. You obviously have laid down a bead or 100 with a welder.

 

[cat951b]

Hi everyone.
Here I am sending the missing photos of the assembly and commissioning - The machine has already been put to work, technically everything works well, but the pump is "crying". It knows the operating pressure of 300 bar, but it is very likely that the control valve will open earlier.
Does anyone have experience in this area?

 

[cat951b]

...

 

[56wrench]

If the noise is coming from the pump maybe it is leaking air on the inlet side in the line to the reservoir or there is a restriction in the suction line to the reservoir that is causing cavitation

 

[Welder Dave]

What a pain if you needed to change a hose on that manifold. You'd have to take off several or a lot of the other hoses off to be able to get the bad one off. Your machine is looking great though!

 

[Gary Layton]

Awesome! That tangle of hoses in your hand is frightening. Amazing work getting it all sorted out. Thanks for sharing it all.

 

[cat951b]

If the noise is coming from the pump maybe it is leaking air on the inlet side in the line to the reservoir or there is a restriction in the suction line to the reservoir that is causing cavitation

The noise is only above a certain load. It's not permanent. I can't measure the bucket from solid ground in one go. The machine does not raise itself completely when I raise it by leaning on the boom. Would you downgrade earlier than you should?!

 

[cat951b]

What a pain if you needed to change a hose on that manifold. You'd have to take off several or a lot of the other hoses off to be able to get the bad one off. Your machine is looking great though!

Hi Dave, thanks.
And I would like to thank you once again for your professional help and advice.


Yes, there are many hoses, but now I have more experience. Maybe a hose change wouldn't be a problem.

 

[cat951b]

Awesome! That tangle of hoses in your hand is frightening. Amazing work getting it all sorted out. Thanks for sharing it all.

Thanks Gary,
surprisingly I only had two bad hose connections because the degreaser washed off the numbers.

 

[Cliffy]

It may be air in a cylinder. Dead heading cylinder will bleed it.
Also check your hose orientation. One may be mixed up.
As above, suction leak is the likely cause and will normally turn hydraulic oil milky or foamy.
If oil is clear and you have a hydraulics pressure gauge, maybe measure the relief pressure.
When a new problem appears after a repair is is almost always related to the repair.

 

[cat951b]

Greetings to all.
I'd like to share with you some photos of my first work. The machine works great! Thanks to Weder Dave and everyone who helped me with good advice to restore the machine!

 

[cat951b]

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