B26 Repairs

   / B26 Repairs #31  
Boom Cylinders are sized for the weight of the tractor. Typically will stall the bucket before rear lifts, though bucket curl might still lift a rear. Bigger Cylinders would be dangerous. Very old thread, wondering how the repair held up?
 
   / B26 Repairs #32  
Sam,
You don't play around! The contact numbers that you received are excellent to have!!

The first thing I'd do is to accurately measure the Hydraulic System Pressure with a Calibrated Master Pressure Gage at the correct Idle RPM and adjust the Hydraulic System Pressure Relief Valve to 420.6 PSI.

I seriously believe that with the required System Pressure at Idle RPM all your flows will be where they belong. The reason I state that is that to achieve the advertised flows through Calibrated Orifices in GPM you need 420.6 PSI at Idle RPM. You DO NOT just raise the RPM!!! When you are running your Engine at any other speed above Idle RPM the Hydraulic System Pressure Relief Valve will maintain 420.6 PSI. I don't believe that the Hydraulic Flow of your Kubota Tractor is adjustable without changing the size of the Orifices.

As before, I don't have the Kubota B26 Manual but Hydraulics was one of my specialties of many and I've designed Hydraulic Systems, taught Hydraulics, and traveled Internationally as an Aviation Consultant throughout the Americas, Europe, Russia (Including throughout Siberia), Asia, and Africa. I was also an Independent FAA DME (Designated Mechanic Examiner) for both Airframe and Powerplant giving the A&P Oral and Practical Exams for many years before I retired.
Good luck to you,
Jim

Hi. Running a 2012 B26 and when trying to plough snow the bucket float starts working as it should, but shortly starts down pressure digging into the earth. This is all the while dtent still holding. Is their some adjustment to fine tune it ? Has done this since new and dealer just said " thats the way she goes with the B26" Thanks in advance.
 
   / B26 Repairs #33  
Hi. Running a 2012 B26 and when trying to plough snow the bucket float starts working as it should, but shortly starts down pressure digging into the earth. This is all the while dtent still holding. Is their some adjustment to fine tune it ? Has done this since new and dealer just said " thats the way she goes with the B26" Thanks in advance.

The reason is the angle and forces on the loader arms while being pushed by the tractor and pressure of the snow passing back. Nothing wrong with the tractor.
 
   / B26 Repairs #34  
The reason is the angle and forces on the loader arms while being pushed by the tractor and pressure of the snow passing back. Nothing wrong with the tractor.

+1 That is normal; both of my FEL's operate like that also. The float is mainly for levelling while operating in reverse. Not intended to replace a rear 3 pt blade, which can be set to float and not lift up like that when going forward.
 
   / B26 Repairs #35  
+1 That is normal; both of my FEL's operate like that also. The float is mainly for levelling while operating in reverse. Not intended to replace a rear 3 pt blade, which can be set to float and not lift up like that when going forward.

That sounds unfortunate and bizzare. They should not call it float then. I have a 1974 JD with detent that does float for snow plowing so just figured Japaninese engineers 38 years later could do the same thing. I guess the solution is to curl the leading edge up slightly and just run on the bucket bottom, and let the front end lift. So much for steering. Good to know I'm in the same boat with a lot of others. Thanks.
 
   / B26 Repairs #36  
Float just means that there is no hydraulic pressure resisting the up and down movement of the loader arms. The trick to get the bucket to ride level is to adjust it to find the sweet spot between digging in and riding up over what you are pushing. It is not an easy thing to do. It is all in the operator' s hands. The bucket is going to take the path of least resistance according to how it is adjusted. That is just how it is no matter what the color of the machine. Good luck.
 
   / B26 Repairs #37  
With some practice, I think you'll get the hang of it. To fill the bucket with something you don't need to use the float; it works great just lowering the FEL to the ground and feathering the bucket to the right angle.

The issue with float is that as the bucket fills up, the added weight in the bucket makes sliding it forward more difficult. Eventually there's enough in the bucket that it doesn't want to slide at all and the loader arms simply swing down as the tires push the tractor forward. If you're using it for levelling, do what Toolguy says.

Good luck!
 
   / B26 Repairs #38  
Float just means that there is no hydraulic pressure resisting the up and down movement of the loader arms. The trick to get the bucket to ride level is to adjust it to find the sweet spot between digging in and riding up over what you are pushing. It is not an easy thing to do. It is all in the operator' s hands. The bucket is going to take the path of least resistance according to how it is adjusted. That is just how it is no matter what the color of the machine. Good luck.

Thanks for the good wishes. If it worked according to your float description, I'd be happy. It does not have no hydraulic pressure. Thats is my entire problem. As I move forward the initial zero pressure changes to down pressure all on its own , hence the front wheels come off the ground, bucket leading edge digs in, and goodbye steering. A very poor snow plough compared to the old JD. All I am looking for is ( does the control have an adjustment ? Is it possible the factory set it wrong ?) Just seems crazy to me that sure a fine engineered machine has this very basic flaw.
 
   / B26 Repairs #39  
I'll be contrarian to the other responses. Doesn't sound like it's working right to me. I use float on my BX25 for snow plowing all the time and as long as it's in the detent position, the bucket floats up and down with no hydraulic pressure up or down. Sounds like something is wrong with your valve. Might be worth opening it up and cleaning it out to make sure there's no microscopic foreign matter preventing it from going into full float mode. Maybe your stick is in float, but the valve is not fully closing off the pressure side. Have you spoken with a service tech at a Kubota dealer?
 
   / B26 Repairs #40  
My B3030 does the same thing once a significant amount of material builds up in front of the bucket. If I stop going forward however, the front end comes back down. It would not do that if there was down pressure on the arms. Does your B26 come down if you stop going forward? Perhaps the extra weight of the backhoe makes the front end light enough that the lifting comes without much material in the bucket. Was your JD a heavier tractor than your Kubota. That could be the difference. If I am pushing something heavy and using float I have to pull the FEL lever out of float once I feel the front wheels start to lift. Otherwise, I loose traction and steering with the front wheels. It is a technique I had to learn from experience. Again, good luck.
 

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