Hydraulic Rupture #2

   / Hydraulic Rupture #2 #1  

txdon

Super Star Member
Joined
Jul 23, 2003
Messages
17,098
Location
Central Texas
Tractor
Kubota M6H-101
Well, I finally figured out what I did wrong to caused my steel hydraulic line to rupture, and darn, If I didn't do it again. This first picture is the way NOT to push against an unmovable object. It will put tremendous pressure on the bottom of the tilt cylinder. If you do not have the joystick moved to the left or right (tilting the bucket) which allows the pressure relief valve to operate......
 

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   / Hydraulic Rupture #2
  • Thread Starter
#2  
......this might happen. The rupture occurred right near the other repaired rupture. Kubota had sent me a replacement line last month. I replaced it and was back clearing brush in an hour. I was very conscious about the relief valve operation and was constantly tilting the bucket. Four hard hours later all is well.
 

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   / Hydraulic Rupture #2 #3  
The good news is that you had not put the spare line on yet.

Have we learned out lesson yet, or just until the next time?
 
   / Hydraulic Rupture #2 #4  
You're going to have to write the manual on how to find the weak spots in our hydraulic lines. I am suprised that a hose hasn't cut loose first. Is it typical for a steel line to break and a hose not to? Pic 1 shows exactly how to tax the lines, that's for sure. I guess we'll all have to start a fund to get you some remote relief valves for downstream of that joystick. Just install them uncircuited and you'll know real fast when your past the limits. /forums/images/graemlins/shocked.gif /forums/images/graemlins/smile.gif /forums/images/graemlins/smile.gif Interesting how that pressure finds the absolute weak point and exploits it with such clarity.
 
   / Hydraulic Rupture #2 #5  
Send this one back to them and get another free replacement.... it seems to be a safety defect that deserves a recall..... /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif
 
   / Hydraulic Rupture #2
  • Thread Starter
#6  
<font color="blue">"Send this one back to them and get another free replacement" </font>

I can't, I feel like this was my fault.

The first time caught me off guard and I had a hard time remembering exactly what I was doing when it blew. As soon as it happened this time I noticed how hard I was pushing and what position the joy stick was in it. As I was driving back to the barn with a limp bucket I was sure hopping I blew the same line with that new spare line in the barn.
I guess next time I rupture it, I will be able to determine if it was a defective line or if repeating the same maneuver will blow any line. I will let that $30 test happen accidentally. /forums/images/graemlins/smile.gif
 
   / Hydraulic Rupture #2 #8  
Don, one of the first times I was using a tractor much the way you describe a fellow told me you never do that. He mentioned you will rupture a line or break something. I have a gauge on my loader that shows the pressure on my dump cylinder circuit. If I back drag, it shows very clearly that the pressures go up very fast. I can very quickly peg it at over 5000 PSI in the blink of an eye. If I were to do the opposite and go forward as you did with the momentum and/or power of the tractors drive with the bucket tilted as your first picture shows and hit either a tough object or an immovable object, I am sure I would pop my gauge and could easily see 6000, 7000, 8000 or more PSI. At some point, somethings going to give. It's better to be a hydraulic line then anything else. You are correct, it is your fault, it's learning it the hard way but your experience should help others avoid it. Is anyone listening? /forums/images/graemlins/grin.gif
 
   / Hydraulic Rupture #2 #9  
I'm assuming it was the repaired line that failed again. The new failure looks like the repair changed the strength of the line and is a different type failure than the first. Think if that piece of line had an x-ray you'd find porosity and undercut.

Hydraulic system should be designed for any pressure the unit may be subjected to.

Egon
 
   / Hydraulic Rupture #2
  • Thread Starter
#10  
<font color="blue"> "So what exactly happens when the line ruptures?" -Scrounger
</font>

Scrounger, the line you see ruptured has a metal cover on it which is "U" shaped toward the loader. There is a muffled pop and then it looks like a garden hose of fluid being sprayed on the back of the bucket and immediately the bucket tilt goes completely limp, the bucket faces completely down and curse words fill the air, don't know where those come from. /forums/images/graemlins/grin.gif
 

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