I was sent a PM by a member asking me a question regarding my 1926 fan drawing. He cannot tighten the eccentric fan shaft nut without binding the fan pulley. Unfortunately I cannot recall the answer to the following question. Question: Does the fan shaft flange seat against the steel (felt) retainer cup, so that the retainer cup cannot turn and acts as a spacer, or does the fan shaft flange go through the retainer cup and seat against the flanged eccentric bushing so that the retainer cup spins on the shaft behind the fan pulley?
According to my drawing, it appears that the shaft goes through the retainer cup and spins on the shaft. Thank you. Jim Patrick
PS. Can anyone provide an answer as to why his fan pulley binds up whenever he tightens the fan shaft nut behind the eccentric bushing?]
The shoulder on the fan shaft sits on the steel dust cup and It does not spin with the fan. So either the lip of the dust cup is bottoming on the back of the aluminum fan hub or the bushings are not pressed in deeply enough.
Thank you Tom. On closer examination, that is the way I have it drawn, with the shaft flange pressed against the retainer disc/spacer and the shaft passing through the felt washer. Jim Patrick
Jim, Is it possible that he is using the wrong year T fan shaft, because the different years are different lengths, if I remember correctly.
Thank you for the input.
Sincerely believe i have the correct fan shaft. Matched it to the original when it arrived from the vendor. Will disassemble and check.
When the fan belt leaves the bottom pulley, the belt is not tight enough. Correct?
Fred. Did you solve the problem of the pulley still binding up when you tighten the shaft nut? That problem must be solved because a loose nut will result in a shaft that is less than true. Is the surface of your pulley straight or bowed? It should be bowed, because the bowed surface of the fan pulley, where it bows toward the center is supposed to automatically center the belt on the center of the pulley, as the belt climbs toward the tightest point, which is the center of the pulley. I'm not sure what would cause the fan belt to work its' way off unless perhaps the fan shaft was bent downward. Do you need a new belt? It may be that your belt may be tighter on one side than the other causing it to move toward the tighter edge. I have a new non-slip seamless belt on mine. Jim Patrick