View single post by Russ Huber
 Posted: Mon Jun 11th, 2018 03:19 am
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Russ Huber

Joined: Mon Nov 14th, 2005
Location: Southwest, Wisconsin USA

FWIW....this "Emerson chatter" topic has been brought up a number of times. Typically most are looking at the gearbox, and the worm/rod which runs from the blade to the gearbox as the culprit. In some cases it may be the culprit.

What does happen over time with the Emerson rotor cast iron bearing surfaces and hardened steel shaft I noticed and dealt with in the past was excessive wear on the REAR bearing surface of the rotor. I restored an Emerson 1510 and it would intermittently chatter. I would dump fresh oil in when it would chatter and the chatter mellowed out, but eventually returned. I could grab ahold of the front of the rotor with the front cover and blade off and feel no significant play. The fiber washers were correctly spaced.

I took it into a vocational school tool and die and the instructor found excessive wear on the rear bearing surface of the rotor.  He had a student machine the rear cast iron bearing surface larger and machined a brass sleeve of correct tolerance and pressed it in place. The fan ran like new when I reassembled it. No more chatter. Good luck.

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