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In Reply to: 686 Transmission Growl posted by Bob Forgiel on Sunday, June 28, 2009:
Bob: You say growls at low speeds not at high speeds, Can you give us a break down in which gears this occurs. I'm thinking you have a bad transmission bearing.
Jack up a rear wheel, anchor the 686 to your 560 so it can't vibrate off the jack. Then take an old broom or shovel handle, cut off square at each end. With tractor running in gear, stick one end of handle to your ear and place other end at various places along rear housing. You'll be amazed at what you can hear, and that you can zero in exactly where the growl is coming from. Come back with the results.
I wouldn't be concerned about the 18.4x38 tires, unless you have her loaded to the limit with chloride and wheel weights. I'd be more concerned about the 2300 hours. Tractor has obviously sat around a lot. If it had one extended period of several years, that is a long time with no oil circulation within the transmission. I ran tractors much like this during my farming career, (300, 504, 656, 560 and 1066) with over size tires. Difference is my tractors were running 800 to 1,200 hours per year. Most clocked up 15,000 hours, 560 was the only transmission I ever saw inside.
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