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Farmall & IHC Tractors Discussion Board |
Re: Badly Pitted Bull Gear Tooth
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Posted by Dick Bowman on July 08, 2000 at 08:44:22 from (205.188.197.27):
In Reply to: Badly Pitted Bull Gear Tooth posted by cheg on July 06, 2000 at 19:30:17:
Weld repairs on heat treated steel gears is not adviseable. Gears are hardened to a specified depth (carburized) while the center areas remain
relatively ductile and soft. Welding up the pit
would destroy the hardness properties of the tooth. Also, during welding a thin layer of fine grained and very hard martensite is formed at the bottom of the weld heat affected zone. Tractor
operation may create stresses high enough to cause
a crack in this layer of martinsite. Get another bull gear for your M, use the old one for a boat anchor.
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