Collins 22A Thred-O-Matic Electric Motor with Switch 115V HS M

Collins 22A Thred-O-Matic Electric Motor with Switch 115V HS M This motor was removed from a Collins 22A Thred-O-Matic pipe threading machine.  It comes with the switch and goes in forward and reverse.  However, there is one direction that is louder than the other.  We check it out and could not determine the cause since the gears seems ok  and we replaced all the bearings inside the motor and motor gear drive.  Unfortunately the noise would not quiet down. You can listen to it on the video. 
The motor, although noisy, works as intended and would get the job done.  Runs on 115 VAC. 
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