Need Help With Propane Tractor

[Anonymous-0]

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!

 

[molineaddiction]

You might try replacing your coil. If these start to break down they will start and just die as you are talking about. If you can get somewhere to have it tested do so if not Napa should have one on the shelf to replace it.

 

[JK2]

I would replace the condenser. My gas M670 Super acted in a similar manner recently. After completely disassembling and cleaning the carb and having it act the same way again, I replaced the condenser and it has run flwlessly since.

 

[Anonymous-0]

Probably the coil. Might be the condenser. Had one suffer from same symptoms just last week. It had a bad key switch, bad coil too. Check the points to make sure they are not burned or pitted while you are working on the electrical.

 

[JLM/ Minn.]

I had a similar problem with my 560 Farmall propane--I replaced the vaporizer diaphram and valves and "set" them and cleaned the water lines within--and leading to the vaporizer. It worked good for a little while and then did the same thing--like starved for fuel. I took it apart agin and was MORE PRECISE in setting the high side valve and opened it up slightly more and then put back together and set low side (idle screw) and it works very well now and has MORE power on the top end (not fuel starved) and no shut off problems. Hope this might help

 

[Anonymous-0]

Thank you to all who helped me out on this!

I checked it all out good and it was a weak coil and a bad condensor! It runs perfectly now!