Metal hydraulic line keeps blowing

[Stone'd Mason]

32822-33412
This part has been replaced on my
L47 three times now. Can, or has anyone ever had a metal line custom made that is stronger ( thicker sidewall I’m assuming ) to replace a week oem part?
Where the bends are in the long 4 foot metal line is where I’m getting pin hole leaks. It’s a time consuming job to get to the line for replacement, not being a tractor mechanic the job took me two full days to replace last time. I even went to a shop that makes custom rubber hydraulic lines, the 2 wire flexible line they mocked up for me didn’t have the clearance to fit in the tight quarters where the metal line goes.

 

[GeoHorn]

Shouldn’t this be a WARRANTY Item?

 

[Russell King]

If you want a stronger line you will be able to get one at a Swagelok store (or similar). There are ZERO Swagelok stores so you may have to go to a reputable hydraulic shop.

Take one of the busted lines with you and they should be able to bend a hardline of greater pressure capacity and install the same type of ends on it.

But that line should be good for the rated tractor pressure so I think you might be creating too much pressure somehow or the line is getting damaged or rusting.

Good luck!

 

[Runs With Scissors]

Thats crazy.

I have never seen a metal line burst/leak solely from an "over-pressure” condition….especially twice.

I’m not saying that it can’t happen, but I would be looking at some sort of “other” cause.

Is the line being subjected to unusual vibration, or motion that is causing it to perhaps develop a small crack from “work hardening”?

Was the leak in the “same spot” both times?

Got pics?

 

[chim]

......................Is the line being subjected to unusual vibration, or motion that is causing it to perhaps develop a small crack from “work hardening”?

Was the leak in the “same spot” both times?.............................Got pics?

I'm thinking that's a contributor as well. Is there any reason the hose couldn't maybe take a slightly different route so it would fit? Not on a tractor, but I've seen tubing fail at bends. I thought it was due to the place in the line that absorbs the movement, plus the metal gets stressed somewhat during the bending process.
I remember reading a paper on corrosion being more of a problem at bends on steel pipe due to the stresses.

 

[TheOldHokie]

32822-33412
This part has been replaced on my
L47 three times now. Can, or has anyone ever had a metal line custom made that is stronger ( thicker sidewall I’m assuming ) to replace a week oem part?
Where the bends are in the long 4 foot metal line is where I’m getting pin hole leaks. It’s a time consuming job to get to the line for replacement, not being a tractor mechanic the job took me two full days to replace last time. I even went to a shop that makes custom rubber hydraulic lines, the 2 wire flexible line they mocked up for me didn’t have the clearance to fit in the tight quarters where the metal line goes.

That is the pressure supply line from the main hydrsulic pump and is unZIque to the L47. Three failures seems incredibly high for a machine thats only been in production for 9 years. What does Kubota say about it?

Dan

 

[PoTreeBoy]

Sounds to me like Kubota made or received a faulty batch of parts, but pursuing that would probably be more trouble than it's worth.

If possible, I'd have the leak welded up. And, if you have the line off, have it heat treated to stress relieve it. At least one person on here has reported successfully welding a line leak, but I don't recall it being an L47.

 

[TheOldHokie]

Sounds to me like Kubota made or received a faulty batch of parts, but pursuing that would probably be more trouble than it's worth.

If possible, I'd have the leak welded up. And, if you have the line off, have it heat treated to stress relieve it. At least one person on here has reported successfully welding a line leak, but I don't recall it being an L47.

I would like to know the length of time between each failure.

Dan