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Kubota B7500 Loss of Power

M

Mnethercutt

Member
My dad has a Kubota B7500 with a LA272 loader on it. We use it for most of our yard stuff, mainly mowing, some drag blading. Recently my dad has told me that after an hour or so of use he notices a loss of power. Tractor struggles to run and he ends up limping it back to the shed and lets it sit. After sitting for a while it'll normally be of for another hour of use, so he thought it was overheating.

Saturday me and him went through and did all the seasonal maintenance stuff (new air filter, fuel filter, oil and filter change, flushed and changed coolant, check everything else). He fired it up no problem, started drag blading and the problem came back within 15 minutes. I'm wondering if it's an injector problem.

Any ideas?
 
I would guess it is a fuel delivery problem form the
tank to the filter. If you take the fuel line off at the
tank and at the filter , and blow it out could be a
easy fix. Some tractors have a screen in the bottom
of the fuel tank, that will come out with the fittings
that the fuel line fastens to. It could be covered with
junk. Doesn?t take much to restrict flow, and as you
say it runs well for the first while then looses power,
sounds like it is starved for fuel, and not a injection
problem, as it would be a constant problem, not just
after a few minutes of operation.
 
Roger has gave you some good advice. If running it with the fuel cap off solves the problem you have to really watch what you do to fix the cap. There is a new and improved cap out for that tractor now. However if you look at you cap it has small openings around the outside bottom that go up to a rubber flat top washer. If the spacer has been lost the washer will not vent. By far the most common problem to cause your symptoms on that model KUBOTA is the injector pump return line is collapsing. When you run it and it gets hot the line will not let return fuel back to the tank and back pressure causes the tractor to shut down. Look right at the fire wall where the three lines come from the tank , you will see the bad place or pinch in the return line.
 
Had that exact problem. When it starts struggling, glance at the fuel filter bowl.
If that is the problem, there should be air or air bubbles in the bowl.
Jon
 
I've had the same symptoms on my B7500 and found fuel cap vent plugged. Actually started to suck tank in. Whether cap was problem or not, would guess in fuel delivery. owned over 17yrs. had a couple fuel related issues. Found I had trouble with aftermarket fuel filters, used Kubota's and cured it.
 

It would be useful to know the hours. If it is high poured and since it is taking an hour for it to happen, if it turns out to not be fuel delivery or sucking air or tank cap, it could be pump wear. A simple though not conclusive test would be to spray, or pour over, the pump some cool, not cold water. if the power comes back it is pump wear.
 
Well we finally got this sorted out. The tractor ended up stopping completely about a month ago, but since I'm in another city it took me a while to get back and forth to fix the issue. Turns out it was a dirty gas tank. Pulled the tank out, rinsed it out with parts cleaner, and reinstalled. A good amount of crud came out, including some kind of spiderweb looking ball and an acorn just the right size to plug the fuel line but not go through! Put the tank back on and it started up immediately no problems.
 
(quoted from post at 12:03:34 06/17/18) Well we finally got this sorted out. The tractor ended up stopping completely about a month ago, but since I'm in another city it took me a while to get back and forth to fix the issue. Turns out it was a dirty gas tank. Pulled the tank out, rinsed it out with parts cleaner, and reinstalled. A good amount of crud came out, including some kind of spiderweb looking ball and an acorn just the right size to plug the fuel line but not go through! Put the tank back on and it started up immediately no problems.
Click to expand...

Mnethercutt, thanks for posting back. I hope that you checked the tank before pulling injectors.
 
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