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Restoration & Repair Tips Board

Can I repair a hydraulic cylinder?

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jpuleo

10-13-2004 22:51:42




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Ive got a old backhoe that has a small problem. The right stabilizer has some small gouges on the chrome cylinder. This must have been caused by rocks getting cought up betwen the cylinder and stabilizer and when raised...OUCH!...a small nick/gouge was created. I have 2 of these spots. They are around 2cm across and mabey 1cm deep. Its a problem because They are right where the seal sits when the stabilizer is up. makes for a pretty decent leak. Could I just fill it with some JB weld and sand smoothe for a cheep fix? Is there a product out there for field repairs of this nature.
Thanks
Joe

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Dave_N_Ga

10-28-2004 18:57:03




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 Re: Can I repair a hydraulic cylinder? in reply to jpuleo, 10-13-2004 22:51:42  
Joe,
Remove the sharp edges of the gouge with a stone or fine file and fill the defects. Been there, done that, IT WORKS!!
I prefer All Metal, JB Weld is my second choice. I keep plenty of both here.
If it still leaks, gouges and nicks typically have sharp edges and the seals "may" be cut.

Dave



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T_Bone

10-27-2004 01:49:58




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 Re: Can I repair a hydraulic cylinder? in reply to jpuleo, 10-13-2004 22:51:42  
Hi Joe,

Very doubtful the nicks are causing the leaking and is more likely leaking from bad enternal seals. Replace the seals and your problem should be resolved.

I strongly advise against welding the pits as with a chrome cylinder you will have to remove more chrome to make the weld and will create more problems than the original nicks would cause.

You would also have to jig the rod to keep it from warping from the heat of welding.

T_Bone

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Ol Chief

10-17-2004 20:54:25




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 Re: Can I repair a hydraulic cylinder? in reply to jpuleo, 10-13-2004 22:51:42  
I have made Hydraulic repairs with a product called New Metal it is an epoxy.I have no experience w/JB weld but it will probably also work.I personally think that you might still have a small leak if welding method is used due to the slight penetration mark often left around the edge of the weld.If you decide to try New Metal to repair ,you will need to just squeeze out of a single tube,place in the area to repair and then tightly wrap a piece of aluminum foil around the rod.This stuff requires metal on the exposed area for a catalitic action to produce a cure of the epoxy.I always used a piece of foil from a pkg. of cigarettes because it is so easy to just sand right thru it and it's gone in a moment.NAPA may stock it or you can find it at most bearing supply houses.Last I bought cost $ 12.00.I have used it in way of worn groves in low speed hydraulic shafts were lip seals caused damage.

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chvet73

10-15-2004 22:38:23




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 Re: Can I repair a hydraulic cylinder? in reply to jpuleo, 10-13-2004 22:51:42  
Proper repair includes a new straight, nick free shaft. Any good hydraulic shop can handle it. But it ain't cheap.
Sometimes a new aftermarket cylinder is your best bet. Try Northern or Surplus Center.



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Allan in NE

10-15-2004 04:07:12




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 Re: Can I repair a hydraulic cylinder? in reply to jpuleo, 10-13-2004 22:51:42  
J,

Heck, it is worth a try.

The thing is no darned good the way it is, so what have you got to lose? JB 'er up, sand it down and see what ya got at that point.

My view,

Allan



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txblu

10-14-2004 06:47:53




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 Re: Can I repair a hydraulic cylinder? in reply to jpuleo, 10-13-2004 22:51:42  
With hyd pressure at 2500# doubt JB would suffice. Could maybe weld, grind smooth and polish, but you just lost your chrome plating and rust would be a problem.

Dunno.

Mark



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newatthis

10-16-2004 12:29:48




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 Re: Can I repair a hydraulic cylinder? in reply to txblu, 10-14-2004 06:47:53  
I have a little experince with hydraulics,epoxies,and welding.Allan rite,I just want to add that you be sure that the surface to be repairer absolutly clean.after a quick wipe with a rag and maby some wd-40 use a clean paper towel and som asitone,MEK,alcohol,or some solvent that will leave no riesidue.do it a few times,verry important if you want JB to stick.Txblu has the best idea, if you hav a welder and can weld.the rust should not be a problem if you can park the shaft repair inside the cylinder when not in use,should last years.

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jpuleo

10-16-2004 16:22:31




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 Re: Can I repair a hydraulic cylinder? in reply to newatthis, 10-16-2004 12:29:48  
Ok, I can weld, so I will do that. Nothing to loose.
Thanks for all the info.



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Jon H

10-16-2004 22:25:50




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 Re: Can I repair a hydraulic cylinder? in reply to jpuleo, 10-16-2004 16:22:31  
I have repaired crome cylinder shafts by filling the nicks with 60/40 acid core solder,then sand it smooth.



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