Re: Re: runaway motor

Posted by Hugh MacKay on February 01, 2004 at 15:53:39 from (64.228.11.56):

In Reply to: Re: runaway motor posted by Bus Driver on January 31, 2004 at 10:28:04:

Bus Driver: My Super A has been doing much the same this winter as Kelly's. I believe it is condensation as I really haven't been using the tractor for anything. Just starting it every 2 to 3 weeks and letting warm up good, charge the battery, etc. Every time I have started it starts to run uncontrollably. If I would let it go it would go way over it's rated rpm. However I always grab the linkage between governor and carb and keep it slowed down. The last two times I shut the tractor down I did as you say, idle it as low as it will go before shutting down. No difference, today the tractor rev same as before. We have been having some quite cold temperatures here, since I last had it going, but today was near the freezing point. I thought a good day to warm up the SA and 140. 130 has been getting good exercise plowing snow.

I started Super A two turns of starter with choke and she fires right up I run for the carb linkage and for the first 90 seconds I have to hold it steady. After that I could let go but after about 20 seconds it's reving again. It took about 3 to 4 minutes and it settled down to normal. It has to be condensation in the governors. I am not getting any frost on outside of carb, and have methyl hydrate in fuel. I add a bit with each start knowing it evaporates. My 140 parked right beside it in shed fired right up and ran normal. The 130 has done this a bit on real cold mornings, but it only lasts 2 seconds, tractor doesn't even get to half throttle.

My dad and I had this same thing happen in Jan 1956 with Farmall 300. Tractor was only few months old at time. Tractor was outside, throttle had been left at low idle, temperature -40F. On the 300 there is no place to get your hands on linkage between governor and carb. That 300 fired up that morning quite quickly and was headed for my guess 3000 to 4000 rpm. I quickly jumped on placed tractor in 4th gear dropped the clutch held brakes on and headed for deep snow. My dad timed this and I was just over 7 minutes lugging the tractor, before it settled down. So it doesn't matter where throttle is left, as the engine if allowed will go far beyond the rated rpm. That 300 was bought new in June 1955, so it is not worn parts that does this. It has to be frozen condensation in the governors.

Don't ask me how it achives the over reving. Back a few years ago having governor off my Super A to replace the spring, I sat for an hour trying to figure how frost could do this if both input and output shaft were free. If anyone has ever figured this out please let us know. I have had this happen a dozen times on different tractors in the past 50 years. I realize my SA not being used is a prime target for condensation. However most of those dozen or so instances have been tractors working everyday. Always gas tractors and yes oil changed regularly as well.

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