A bit of a followup: To make a long, long story short, the transmission case has always had a tiny crack on the side where a broken moving part smashed into it from the inside many years ago. That crack had never leaked -- until a few months ago when I ran the tractor for several hours in very cold weather. Apparently the thermal stress of the rapid warmup opened up the crack and it started leaking again.
I called a mobile welder and asked if he could repair the crack. He explained in detailed technical terms why the weld probably would not hold. The only way to get it right would be disassemble the entire transmission to isolate the cracked side. Instead, he recommend that I clean out the crack and try some steel epoxy.
The first thing I did was to take a heavy hammer and hit the protruding side of the crack (it was only about a millimeter out from the rest of the case). I was able to push it back so far into place that the leak was reduced to about a quarter of its original rate.
After letting the yellow oil drain for a day, I put a hair dryer into the fill hole and let it run for several hours. The transmission casing closest to the hair dryer got pretty hot -- well over 100ºF.
So while I was heating the inside of the transmission, I scrubbed the area of the crack down with a fine wire brush and acetone, working really hard to get the bristles deep inside the crack.
Next I let the metal cool to about 90ºF and then applied the epoxy. The warm metal softened the epoxy so that it went readily into the crack. Then I gave it 24 hours to set.
This morning, I filled the transmission with 90W oil and ran the tractor for about half an hour. I let it cool for an hour and then checked it. The epoxy has held -- so far. But when I checked the new oil, it was yellow. Sheesh, NOTHING will get that water out of that transmission!
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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