That could be, but it's more likely that someone tried to remove the steering wheel by pounding on the shaft. That will knock that plug out.
On my 340 (I think they use the same gearbox) I tried to put a 1-7/8" steel freeze plug in there with it still on the tractor, but that ended in failure because the outer ring of the original plug was still in there. So here's what I did:
I got a washer slightly larger than the hole and ground the outer circumference until it just fit inside the casting, then I welded the center hole shut. I cleaned the washer and the area inside, outside and all around the plug hole with brake cleaner and compressed air and glued the washer in place with a big glob of silicone. I used a wooden wedge to hold it in place overnight while it cured. I was then able to fill the gearbox with Hytran and enjoy smooth power steering!
I plan on rebuilding the gearbox this winter, so this is only a temporary fix (or is it??)
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Today's Featured Article - Tractor Profile: Silver King - by Staff. Silver King tractors were produced by the Fate-Root-Heath Company of Plymouth, Ohio. The company was founded by John Fate in 1884 and was originally called the "J.D. Fate Company". After several mergers over the years, the final company name of Fate-Root-Heath came about in 1919. The first tractor produced was actually called the "Plymouth" tractor and was powered by a 20 HP 4-cylinder engine with a 3x4" bore and stroke. The four speed transmission had a top speed of 25 mph! After more t
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