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Tool Talk Discussion Forum

Scored hydraulic piston rod -- what to do?

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Charlie

09-07-2003 17:58:43




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The rod on the crowd cylinder of my old Trojan backhoe is considerably pitted and scored. Can these kinds of things be filled, fixed, or otherwise repaired at reasonable cost. What's involved and what kind of place do you go to to minimize cost (hydraulic shop?, machine shop?, etc.). It's a 2 inch rod and the working surface is 40 incles long. Any rough idea of cost to recondition, if that is even possible? Thanks.

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John K

09-25-2003 21:43:11




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 Re: Scored hydraulic piston rod -- what to do? in reply to Charlie, 09-07-2003 17:58:43  
I have used J B weld for shafts and hydrolic rams, be sure to remove any oil, I use spray brake cleaner for cleaning. Then use a fine emery cloth to polish the repair. A friend used the above process to patch a gouge in the cylinder wall with great results. Just a not of caution, if you leave the J B set to long, it gets real hard and tough to sand or even file.



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Charlie

09-11-2003 06:55:50




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 Re: Scored hydraulic piston rod -- what to do? in reply to Charlie, 09-07-2003 17:58:43  
I appreciate all the suggestions and am in the process of sorting them out and deciding which way to go. After I do that, I'll provide a summary here for anyone else who encounters this problem.



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oleblu

09-08-2003 17:52:02




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 Re: Scored hydraulic piston rod -- what to do? in reply to Charlie, 09-07-2003 17:58:43  
Charlie, I've never done this or seen it done, but the guys at the hydraulic place I use say to fill the spots with Super Glue and use fine emory cloth to smooth it out when it dries. I'm sure they mean to clean the shaft first with alcohol (NOT the 12 oz. kind) as a prep. Good luck, and if you try the Super Glue, post back here to let us know how it turns out. oleblu



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Dick

09-08-2003 16:48:53




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 Re: Scored hydraulic piston rod -- what to do? in reply to Charlie, 09-07-2003 17:58:43  
Hi Charlie,,
I'm sure you know the best and most expensive idea is the simply replace the cylinder. The second option is to take the cylinder to a cylinder repair shop and pay to have it repaired. In some cases this could cost you just as much as buying a new one. Both of these options are easy and I'm sure you had thoguht of both of them already.. But,, the reason you consulted this forum is because you thought some of the ideas here could allow you to fix it yourself. (like T-bone's idea).. Most of us know how to spend the money for a new part,, since we have to do it all the time for those things that can't be fixed in our shop. This forum can be a good source for finding those hard to get parts,, and also,, this forum can be a great source for ideas on how to fix things yourself.. I think this is what most of us are looking for.. So,, unless you have the money to buy a new cylinder or get ripped off at a shop,,, then give T-bones idea a try.. If it works,, like I'm sure it has worked for T-bone,, then you can feel good because you repaired it yourself, and,, saved a lot of money..

Dick

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T_Bone

09-08-2003 11:45:21




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 Re: Scored hydraulic piston rod -- what to do? in reply to Charlie, 09-07-2003 17:58:43  
Hi Charlie,

If it's not tearing up the shaft seal then don't worry about it. I had a bent rod on my loader and straighten it and had alot of pits when when I got done. I got about 100hrs on the repair without leaks or ruining the new seal.

If you need to resurface the rod then I would consider using lead. Wheel weights would work well. Lead is liquid at 500*f and applys well at 750*.

I would make a jig for holding the rod horzonital. A couple pices of angle iron tack welded to the a steel bench would work with rod centers. Clean the rod surface with heat as you need to heat the surface to apply the lead. Wipe the rod with murtic acid while hot as this will make the lead adhear to the rod. Apply molten lead then use a rag while turning the rod too smooth out the lead in voids thus wipe off the access lead. When filled, then wrap the rod with a leather strap to a motor pully and use emery paper to finish.

T_Bone

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Mark

09-08-2003 09:42:31




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 Re: Scored hydraulic piston rod -- what to do? in reply to Charlie, 09-07-2003 17:58:43  
The Old lady runs the office at a Hydraulic shop. Correct cylinder repair requiers both shaft replacement and honing of the cylinder. Any good shop can replace your shaft. If you skimp on the repair it will leak again. By the way good repair ain't cheap. Your looking at several hundred bucks.



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john

09-08-2003 04:01:12




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 Re: Scored hydraulic piston rod -- what to do? in reply to Charlie, 09-07-2003 17:58:43  
CHARLIE:
you are going to get me to talk out my back side but here goes!!!!!
I thought cylinders were unrepairable. BUT I once work as a operator at a major crane rental place. /// mind you not a mechanic but a operator/// they would take a scored cylinder and fill with I think J B weld then emery cloth down smooth. you could see repair spot but it was smooth enough it would not tear seals up any more. Mind you I am talking about 8 to 12 inch by 15 foot cylinders.the labor cost to repair a "considerably pitted and scored" backhoe rod is probley not worth it.

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Bob

09-07-2003 18:53:40




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 Re: Scored hydraulic piston rod -- what to do? in reply to Charlie, 09-07-2003 17:58:43  
A good hydraulic shop will have, or have access to, chromed shafting, and can make it new rod to match your damaged one.



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Mac

09-07-2003 18:27:59




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 Re: Scored hydraulic piston rod -- what to do? in reply to Charlie, 09-07-2003 17:58:43  
No idea of the cost, but check with a machine shop/hydraulic shop. I have seen electro-plating work well. Maybe they can refer you to such a place that does this. Someone else here on the board may have a reference.



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