CTS2
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Posts: 70
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Post by CTS2 on Oct 29, 2021 4:34:16 GMT -6
I have just bought a second hand tri-axle tipper, with a multi stage hoist. The previous owner said it would leak a bit for the first couple of tips of the season and then take up and be okay after that. I have no reason to doubt him but I don't really know how a leak would stop itself. He said that he never tried tightening the packing rings because it wasn't much of a problem. I've connected it up and tipped it up a couple of times, and sure enough it leaks. It seems to me that I should try tightening up the packing nuts. I believe if I go too tight, the tub may not lower when empty. How tight should they be? I've also heard that I should loosen them before tightening them. Is this correct? Anyone had success stopping hoist leaks? Pictures are not the actual hoist, just a similar example to show what I mean in case terminology is different on the other side of the world. Attachments:
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Post by Albertabuck on Oct 29, 2021 8:33:22 GMT -6
My experience has been with multiple stage cylinders that if they have been used a fair bit, the packings and guide rings usually need to be replaced. Also the barrels need to be checked for scoring as well. Before trying to tighen a packing nut I back it off completely and makes sure threads are clean and that the nut turns freely, then like an oil filter, spin it on till it makes contact and then with about half turn increments, tighten it further. I do it in such a way that I can slid the barrel in and out to sense how tight things are getting. You want it snug but not tight. It depends on make on exactly how its put together, they are not all the same. Sometimes rotating a barrel independent of the others will reduce leakage if the packings are damaged due to barrel scoring without even doing anything else.
On low use cylinders I def will monkey with them a bit to reduce leakage. High use, there are exchange programs with the shops that sell and rebuild hoists and most often that is the most cost effective way to go, especially if the cylinder is wore and there is lots of scoring of the barrels.
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Post by badaltitude on Oct 29, 2021 9:23:49 GMT -6
I have tightened the collars on enddump cylinders in the past. Didnt get too fancy though, just snugged up the collars on the leaky sections. Usually was enough to stop the seeping. Though these cylinders were in generally pretty good shape and not worn out. Sometimes dumping on steep slopes even good cylinders will leak from the extreme sideways pressure on the seals.
I have seen cylinders leak after sitting for extended periods. Used to have a Komatsu cat that the dozer cylinders would leak quite a bit for the first couple days after sitting but eventually would seal up.
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bruced
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Post by bruced on Oct 29, 2021 17:49:25 GMT -6
Hendersons Welding and Hydraulics in Wagga repair a lot of these. They are good people and would advise you over the phone. I can't tell if you are close to Wagga or not. They work Saturdays.
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kwo
New Member
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Post by kwo on Oct 30, 2021 2:16:25 GMT -6
I have a hoist that sound similiar, leaks quite a bit on the first up and makes a mess but good after that as a rule.
I now try to put the hoist up slowly empty if it has sat for some time, it's like there is trapped oil between the gland and plunger that is the wrong spot.
This hoist had been resealed before I bought it but had sat for some time.
I did tighten it up a bit and that did help.
There are set screws on the rings that lock on the threads, so loosen them first or you will damage things, I would work on 1/4 of a turn and see how that looks.
Good luck.
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