I have a Minn. Moline Model M670 that I use to bale hay with and as luck would have it, I have hay down and an ailing tractor!I need some opinions as to how I should go about diagnosing my tractor. It was a perfect runner until about two weeks ago it sputtered and back fired exactly like it was starving for fuel. Then it ran good for another hour, then it did the same thing, ran fine for another hour then it died. I had to choke it extensively to get it to restart, then it onlt ran for about one minute and died and refused to restart.
I thought it might have been icing so I let it sit until the next morning, started after hard choking, then it died after one minute. It will pull itself about 30 yards or run for one or two minutes, then it acts like it is out of fuel, only it doesn't backfire anymore.
I checked the tank, it is nearly full, then I checked the lines to the filter, they are fine, then I took out the filter, it is in good condition, then I took out the diaphram and it looked used but good I determined that fuel was reahinh the needle valve and all is good here. I then checked all of the lines leading to the carb, they are good. I took apart the carb and cleaned it and checked the little diaphram, it is good. I then replaced the big diaphram on the vaporizer unit for good measure, no improvement.
I then checked for spark and point gap, all is good here also.
If it were electrical, why would it start and run strong before it dies?
I cannot find any reason why it should not be getting fuel. I have used this tractor extensively in the past with absolutely no problems. Any help you could give me will be appreciated as I am stumped!
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