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Restoration & Repair Tips Board

Repair of Pitted Hydraulic Ram

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AWB

10-20-2006 19:41:25




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I have a hydraulic ram that is pitted and needs to be repaired. The pitted area is on one side of the ram and extends for about 2 inches from the end of the ram. The pits are very tiny. I thought about removing the rust with a amall amount of muriatic acid, and then filling the cleaned out pits with some JB Weld, then using some very fine emery cloth to end up with a nice smooth ram surface that won't damage the new seals. Does this sound workable? Anyone out there with any other ideas? Thanks.

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george md

10-23-2006 21:42:41




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 Re: Repair of Pitted Hydraulic Ram in reply to AWB, 10-20-2006 19:41:25  
AWB,

The simple method is to go to a hydraulic

supply and buy a piece of chrome rod . Put it

in the lathe , turn the ends to what you need .

It's sold by diameter and length in inches .

I make them often .

george



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AWB

10-24-2006 06:59:55




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 Re: Repair of Pitted Hydraulic Ram in reply to george md, 10-23-2006 21:42:41  
Thanks for the information. Getting a piece of chrome rod sounds like the best solution yet!



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souNdguy

10-21-2006 22:13:23




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 Re: Repair of Pitted Hydraulic Ram in reply to AWB, 10-20-2006 19:41:25  
So.. you really want that jb weld in your hyd system? Not me.

I'd silver solder it.. or braze it.

Clean it up real good.. and flux the heck out of it.. runt he brass around it or SS, then file down, then polish. Will be an all but permanent repair... seal and wipe should be happy.. and won't disintegrate like a 'glue' will.

Soundguy



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OlChief

10-21-2006 18:29:03




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 Re: Repair of Pitted Hydraulic Ram in reply to AWB, 10-20-2006 19:41:25  
Years ago a friend had the output steering shaft leaking in way of a grove worn by the lip seal on a Lincoln power steering system.He coud not afford to have a dealer replace the shaft so asked me if I could or would try to repair it.I really had no ideas for the repair except to install a Speedy Sleeve.No luck,no sleeves to fit.The counter man at the bearing supply suggested using a product by Permatex called Liquid Metal or New Metal ( I don't remember precisely ) so I purchased a tube. After I got home and ready to use it, the instruction said that the stuff in the tube will only cure and set up hard if mated to another metal.So what to do? After a little thought I decided to apply the product and then wrap the shaft with the aluminum paper from a cigarette package and tie it.That did the trick. Next day I removed the string and the aluminum was bonded to the shaft over top of the repair product.I very carefully filed off the excess material and finished the surface with wet 400 emery paper.The stuff worked very well.We put in a new seal and then no more leakage. I believe your idea to use J B would work, however have no idea if the J B has the same liquid penetrating ability as the liquid stuff that I used.Hint, if you use any acid make certain to neutralize it with baking soda and water prior to any filling of pits.

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135 Fan

10-21-2006 02:51:32




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 Re: Repair of Pitted Hydraulic Ram in reply to AWB, 10-20-2006 19:41:25  
That might work but there would be very little surface area holding the JB weld. I saw a new elevator cylinder that was shipped in a thick cardboard tube that somehow got gravel in it. A new one was through the roof. The pitts were welded with very small stainless steel electrodes. The shaft was covered and sprayed with anti-spatter around the weld area. The shop made a jig to put a die grinder in that would slide up and down the shaft and grind the weld down. They left it slightly higher and used some very careful filing and a caliper to finish it. Not sure if you need to go this route. Your cylinder isn't as critical as an elevator. Dave

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AWB

10-21-2006 05:48:02




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 Re: Repair of Pitted Hydraulic Ram in reply to 135 Fan, 10-21-2006 02:51:32  
Thanks, Dave for the information. I will consult with my local machinist and see about having that done. For originality sake I have to salvage the ram if at all possible. No replacement part is available. Thanks, again.



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135 Fan

10-21-2006 13:04:05




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 Re: Repair of Pitted Hydraulic Ram in reply to AWB, 10-21-2006 05:48:02  
Your cylinder is probably small enough to fit on a lathe which would be easy to machine to size. The elevator shaft was about 16 to 20 feet long. Dave



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Jon Hagen

10-21-2006 06:43:22




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 Re: Repair of Pitted Hydraulic Ram in reply to AWB, 10-21-2006 05:48:02  
I have repaired many pitted/gouged cylinder shafts by cleaning,then filling the pits with 60/40 acid core solder. Then tape sanding to smooth it, for a durable low cost repair.



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