Sounds like the armature is contacting the motor casing. Probably worse under load but yes bearings.

On October 26, 2021 1:17:50 PM EDT, Paul Anderegg <tpa2008@gmail.com> wrote:
>E20
>
>On Tue, Oct 26, 2021, 12:17 PM Nick Skinner <kc2dzb@nycap.rr.com> wrote:
>
>> Paul, which tractor model is this? Some have a centrifugal switch, which
>> this may be. Otherwise, I'd suspect bearings.
>>
>> Nick
>>
>> -------- Original message --------
>> From: Paul Anderegg <tpa2008@gmail.com>
>> Date: 10/26/21 12:55 PM (GMT-05:00)
>> To: Dean Stuckmann <dstuckmann@icloud.com>
>> Cc: elec-trak@cosmos.phy.tufts.edu
>> Subject: Re: (ET) Strange sound from motor
>>
>> I pulled the belts off. Motor spins freely. When I spin it by hand it's
>> silent. When I apply the throttle then it starts making a screeching sound
>> again without the belts on.
>>
>> On Tue, Oct 26, 2021, 11:24 AM Dean Stuckmann <dstuckmann@icloud.com>
>> wrote:
>>
>> > I would start by making sure that it is the motor by taking the belts off
>> > and running the motor by itself. I assume that the motor spins freely?
>> >
>> > Take care,
>> > Dean
>> >
>> > > On Oct 26, 2021, at 10:40 AM, Paul Anderegg <tpa2008@gmail.com> wrote:
>> > >
>> > > I get a strange sound coming from the motor. It usually starts after
>> it
>> > > runs for a couple of seconds. I posted a YouTube video of it. The sound
>> > > starts at about six seconds into the video. I have included the link
>> > below.
>> > >
>> > > https://youtu.be/DYOYZqdiQik
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