Kubota 2650 w/loader - hydraulic line pops off

   / Kubota 2650 w/loader - hydraulic line pops off #1  

SouthernSky

Gold Member
Joined
Jun 10, 2005
Messages
343
Location
Deville, LA
Tractor
2013 Kubota L3200DT
I'm new here and searched through this forum and got some ideas, but I haven't quite figured out the "why" to this.

My Kubota L2650 has three hydraulic lines coming off the loader to the control handle. For some reason, everytime I put too much of a load (though most times it's not even a big load anymore), one of the hydraulic lines keeps disconnecting at the quick disconnect by the right front wheel. When this happens, the loader nor the box blade will lift up. I have to turn off the engine, jump down, reconnect it, fire it back up, and it will go a few more minutes before it does it all over again.

The local Kubota dealer thought it had something to do with the draft control, except all I have is a standard three point hitch in the back. But he couldn't fix it.

Any thoughts would be greatly appreciated! Thanks in advance!
 
   / Kubota 2650 w/loader - hydraulic line pops off #2  
Could be a bad disconnect. You might want to take a close look at the disconnect to see if there is anything that doesn't look right, such as scratches or deformities on the male part. Check the female part to be sure the metal balls are moving all the way closed.

Please be careful when inspecting, especially the female end. Wear safety glasses in case some of the hydraulic fluid squirts out while you are looking or probing.

If it is the male part it should be obvious when you compare it to a connection that is not causing problems. The female part may be harder to analyze.

If possible you may be able to switch places with 2 of the connections, say the 2 that control dumping the bucket. If after switching one of the connections pops off you will at least know which part of the fitting is bad.

Bill Tolle
 
   / Kubota 2650 w/loader - hydraulic line pops off #3  
I had a similar problem and it was a defective quick disconnect. I have also found that if the hose is located close to any metal parts that if the hose should jump because of movement of the loader, the "drag" on the metal at the quick disconnect sometimes would cause it to come apart. I feel that the quality of the brand of disconnect that Kubota uses is inferior to the Parker brand quick disconnects that I have been replacing the problem ones with. Once I change to Parker, I don't have any more problems with them. On the Kubota disconnects, some of the machining tolerances must be off. I have no tolerance for poor tolerances... /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif
 
   / Kubota 2650 w/loader - hydraulic line pops off #4  
In this case replacing both male and female ends would be best.
 
   / Kubota 2650 w/loader - hydraulic line pops off
  • Thread Starter
#5  
I took all your advice and popped the hose and fittings off today. I have a place locally with Parker fittings and so I'll get new parts tomorrow. If it doesn't work, I'll be back...

Thanks!
 
   / Kubota 2650 w/loader - hydraulic line pops off
  • Thread Starter
#6  
Well, ****, that didn't work. I bought a new hose and new Parker quick disconnects and M/F connectors -- no go. I just took the tractor out to bushog two grassy acres and it popped off seven times, no heavy loading.

Any other ideas? Thank you!!
 
   / Kubota 2650 w/loader - hydraulic line pops off
  • Thread Starter
#7  
I'm still whipped on this. Not only does the one (of three) hoses pops off, but when it does, I can't raise the front loader or the back hitch.

Any guidance would be greatly appreciated!
 
   / Kubota 2650 w/loader - hydraulic line pops off #8  
</font><font color="blue" class="small">( I'm still whipped on this. Not only does the one (of three) hoses pops off, but when it does, I can't raise the front loader or the back hitch. )</font>

That's because the line that came off is either the pressure line to the loader valve or the power beyond line from the loader valve. In any case, you have interrupted the series circuit that flows the implement hydraulic fluid. That's why nothing works.

I would not run the engine when in this condition as it could damage the hydraulic pump since there is now no open loop for fluid to flow back to the reservoir.

As to why the QD's are becoming disconnected after you replaced the old with new, here are my suggestions as to why. <ul type="square"> [*]Excessive vibration [*]incorrectly sized QD's for the flow and pressure of your system [*]defective QD's [*]system pressure set too high [/list] One thing you might try is to replace the QD's with standard fittings. This would eliminate any questions regarding the QD's. Another is to have the system pressure checked just to be sure.
 
   / Kubota 2650 w/loader - hydraulic line pops off #9  
I still occasionally have the same problem. I have looked at this carefully and have determined that it is a result of the friction of the coupler moving next to another line that might be the culprit. I tried to eliminate this movement by using a plastic tie wrap to limit movement. So far, it is working for me. You might try the same thing.
 
   / Kubota 2650 w/loader - hydraulic line pops off
  • Thread Starter
#10  
Mad,

I never though of removing the QD's and replacing them with a permanent coupler. Considering I've had this tractor's loader for over five years and never removed the bucket, that could be a fix....however....

How would I see if there is too much pressure in the system? I don't want to destroy anything else if I get rid of the QD.
 
 
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