scored piston on backhoe ---

[Unregistered2013]

-- can they be repaired?

it's causing the seal to leak a bit --

-- tried sanding with 150 and 800 grit, but wasn't thrilled with the response --

-- it's on the outrigger arm --

-- one thing kubota DOESN'T do is put shields on those -- very stupid decision --

thanks!

 

[RoyJackson]

Onced scored, it's time for rebuild, replacement or live with some leakage.

 

[Wacky]

Agree with Roy. Once scored the material is gone, sanding will only remove more, granted it will taper the scoring out, but never the less will remove the thickness around the scratch which will decrease the seal around the cylinder. Albeit minor amount of removal.

 

[Unregistered2013]

thanks for this --

-- sorta feared this response --

 

[crazyal]

Are you talking the actual piston or the chrome rod? If it's just the rod then you should be able to rebuild it without spending a fortune. There are companies that will cut the end off of the rod and weld on a new one. I assume this is what you're talking about. If there's damage to the piston and the inside of the cylinder wall you may be better off looking for a used replacement.

 

[Unregistered2013]

i'm sorry -- it's not the piston --

-- it's the rod --

-- that makes much more sense --

 

[kennyd]

I have heard of filling the gouge with a brazing rod and torch, then carefully file and polish to the height of the surrounding chrome.

 

[JoelD]

Wayne hose can answer better than I, if you use the machine a bunch then I'd probably replace the rod. I can't imagine it being too crazy money.

Joel

 

[smilingreen]

You should be able to replace the rod on the cylinder. You will never get the cap seal and wiper to quit leaking hydraulic fluid. Find a local hydraulic shop and see if they can order you a new rod. Buy the rebuild seal kit, also. That may save you a few dollars by not having to buy the whole cylinder.

 

[RoyJackson]

I have heard of filling the gouge with a brazing rod and torch, then carefully file and polish to the height of the surrounding chrome.

I've seen it done with silver solder (same as braze, but a little more heat). Silver solder holds up better then brazing rod.
Kind of chancy though. Might end up rebuilding anyway.
Can't help to try though...

 

[Bill Hoffman]

Try filling the scratch with JB weld and then sanding smooth.
It may work, what have you got to lose? All you're trying to do is to fill the scratch so that it will engage the entire surface of the seal.

Bill

 

[kennyd]

Try filling the scratch with JB weld and then sanding smooth.
It may work, what have you got to lose? All you're trying to do is to fill the scratch so that it will engage the entire surface of the seal.

Bill

My fear of JB is that it may not adhere well and come off inside the cylinder.

 

[Scooby074]

Get yourself some Corcus cloth. You can try to clean it up a bit. It will likely still leak, but might be a little less. Alot depends on just how deep the scratches are.

You can try to fill and file the scratches use SS or braze. That can work. Wouldnt hurt to try as the rod is already damaged. Honestly though, if your wanting it leak free, your likely looking at a new rod or rechrome and seals/.

 

[kennyd]

I've seen it done with silver solder (same as braze, but a little more heat). Silver solder holds up better then brazing rod.
Kind of chancy though. Might end up rebuilding anyway.
Can't help to try though...

HHMMM...

I though SS was softer and melted at lower temps than braze:confused2:

 

[MarkV]

How did an outrigger cylinder get scored? Actually how does any cylinder get scored? It would seem that an outrigger is one of the least used cylinders on a backhoe.

MarkV

 

[Scooby074]

How did an outrigger cylinder get scored? Actually how does any cylinder get scored? It would seem that an outrigger is one of the least used cylinders on a backhoe.

MarkV

Hit by falling rocks, or scraped by the bucket. Some machines can get the bucket close enough to the outriggers for this to happen. At least this has been my experience. Not sure about the OP

 

[kennyd]

Hit by falling rocks, or scraped by the bucket. Some machines can get the bucket close enough to the outriggers for this to happen. At least this has been my experience. Not sure about the OP

Falling rocks/debris is by far the most common way...especially on an outrigger.

 

[RoyJackson]

My fear of JB is that it may not adhere well and come off inside the cylinder.

Yep...not going to be much surface area to work with...

JB Weld is great stuff in the proper applications....don't think this will be a good application.

 

[RoyJackson]

HHMMM...

I though SS was softer and melted at lower temps than braze:confused2:

You're right, Kenny!! I got it backazzwards...Soldering is distinguished from brazing by use of a lower melting-temperature filler metal...

 

[Unregistered2013]

Hit by falling rocks, or scraped by the bucket. Some machines can get the bucket close enough to the outriggers for this to happen. At least this has been my experience. Not sure about the OP

bingo -- they're way too exposed to dirt and rocks --