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Rotating fan on letter tractors

M

machineryman1945

Member
Recently had a discussion about the movement of the fan on letter tractors ie A,B,G etc....question was if the fan should be easily turned or moved with engine stopped. I had never given it much thought as I knew they were spring loaded with keepers. Never knew there was another other factor with torque rotation or any other movement. Maybe in many years of experience there is something new to learned. Any comments.
 
The ones I have seen on letter (except D) and early numbered tractors were two plates with friction material that clamped the fan between them via a big spring bearing against an arrangement like an
engine valve cap and keepers. Periodically, the fan would be checked to be sure it could be moved with effort between the friction plates-with the engine stopped! The fan did not in any way come close to
free-wheeling or easily slipping. The point was to keep from breaking the fan shaft or bevel gears if the fan hit something solid like a heavy tree branch. It might keep an arm from being amputated
completely, but certainly not a finger. The point was to save damage to the engine, not your hide. I don't think it was OSHA approved . . .
 
I can't speak for the A, B, G tractors, but on the 50 that I recently overhauled, the fan is easy to turn by hand with the engine stopped. I put new frictions in the fan clutch when I overhauled it. The fan would not turn by hand before I replaced the frictions.
 
My question is if fan wont turn with out engine turning when motor is not running can that make noise when engine is running sounding like coming from governor.
 
If fan has clutch and can't be slipped it probably
has rusted. It still should not turn too easy when
in good shape.
Noise is probably bearing or gear wear.
 
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