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Old 09-15-2019, 04:35 PM
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Default Another leak

Recently I acquired another yellow nigger, a Komatsu PC20. Camdigger and i looked at it when I was at his place. Then, with some trading, Cam hauled the thing home.
During testing and the ride home, there was no sign of an oil leak, as I was watching for that. The Hyd tank was a bit low, though. So once it arrived and it stopped raining, I went out to play in the mud. All went well, happy with the breakout force compared to a Kubota, and then I started leaving a trail of oil.
I drove it into the shop, it bled all over the apron and the floor, it's a mess in there now, I'm working on that, about 3-4 gallons of oil to suck up.
So, between my wife and I we figured one of the hard lines was dripping. Today we finally got at it and removed the line and it looks like a rock burrowed in and found a home.
So I boiled it in a red heat to get the oil out of it, and went ahead and tig welded it. Used some rebar wire for filler. Even with prep and cleaning I still had enough carbon particles to leave a blow hole, so I re-welded the spot and the problem left the site.
I used varsol to test it and it passed, but if it wasn't metric I could have pressurized it with air.
Margot was under the machine cleaning and she greased the circle gear, and also was a the main tool fetcher.
So now all is well and I hope that is the last problem for a while.
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Gerry
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Old 09-15-2019, 04:56 PM
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Looks well sealed now.
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Old 09-15-2019, 05:26 PM
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I usually braze those, looks good
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Old 09-15-2019, 06:53 PM
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We have fixed lots of worn lines like that--my brother usually uses everdur rod with the tig torch. I actually think he's found something that he likes even better--don't know what it is since tig welding is his department...
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Old 09-15-2019, 07:46 PM
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Quote:
Originally Posted by LKeithR View Post
We have fixed lots of worn lines like that--my brother usually uses everdur rod with the tig torch. I actually think he's found something that he likes even better--don't know what it is since tig welding is his department...
I think coat hangers work better than rebar wire. That would probably make your brother shudder
I debated using silver solder with the tig welder, but the roll of wire was closer.
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Old 09-15-2019, 08:27 PM
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Glad you were able to fix it relatively inexpensively.


What function was the line for? Rotation of the body perhaps?
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Old 09-15-2019, 08:44 PM
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Quote:
Originally Posted by camdigger View Post
Glad you were able to fix it relatively inexpensively.


What function was the line for? Rotation of the body perhaps?
Tramming in reverse on the right track. It is in a unprotected spot and has 2 more hardlines stacked above it, so a rock behind there could never get out.
Most of the drive motor lines are behind a guard plate but that corner is not covered.
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Old 09-15-2019, 11:26 PM
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Quote:
Originally Posted by Ironman View Post
Tramming in reverse on the right track. It is in a unprotected spot and has 2 more hardlines stacked above it, so a rock behind there could never get out.
Most of the drive motor lines are behind a guard plate but that corner is not covered.
Will you be engineering something?
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Old 09-16-2019, 05:50 AM
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Nice looking digger there. I am jealous.

Nice tig weld. I usually use SS tig Rod on regular carbon steel.

I welded up a rub hole on forklift line years ago, and to my knowledge it is still working. Of course, since it been almost two years since I moved on, I would not know for sure.


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Old 09-16-2019, 07:33 AM
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Quote:
Originally Posted by mccutter View Post
Will you be engineering something?
No, I don't think so. It is right on a corner, and I think a bit of pressure washing now and then, and inspecting the area is better. If I catch anythin in there again, all I would do is tuck in a piece of foam rubber to fill behind the tubes on the corner where they form a pocket. Then gravel can't get in there to rub.
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