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HYDROLIC LEAK DOWN

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skipll
Join Date: Feb 2011
Posts: 184 Robbisville NC USA
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2011-08-22          179950


I put the bucket up as high as it would go on my Kobelco SK 015 excavator ( made in 1993). Turned the engine off. After 1 hr. 10 minutes the bucket was on the ground. (engine off)
Is this normal?




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HYDROLIC LEAK DOWN

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auerbach
Join Date: Sep 2007
Posts: 2168 West of Toronto
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2011-08-22          179951


Normal? Yes for seals to deteriorate after two decades of hard service. No for a new machine -- or for one that had its cylinders and/or controller recently rebuilt. They hold up for a long time, but they're still a wear item.

The internal leak is not so bad now that it's an immediate must-do. It's like when to re-roof your house. If you can't see it leaking you can wait a year or two, but when it's convenient you might as well get it done.

A hydraulics guy can test for where the main internal leak is, and you can get just that done, or you can get them all resealed in one go.

....


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kthompson
Join Date: Oct 2005
Posts: 5275 South Carolina
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2011-08-22          179952


Skip no idea on your machine but some will have (no idea if correct name but what I learned them as)a holding valve that would take the load of holding such just in case of failure while load was in the air. I have seen Teflon tape cause those to stick open.

I would have it checked, soon or later you will end up with a load suspended you don't want dropping. ....


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auerbach
Join Date: Sep 2007
Posts: 2168 West of Toronto
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2011-08-22          179960


Absolutely. If something breaks or blows while there's a heavy load up and someone under, ....

They are in fact generally termed holding valves or latches, and sometimes things like load-holding, load-lock, brake valves or latches, etc.

....


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