I have a brand new roast that I have roasted on for maybe 10 or 15 times now. I just started hearing some grinding noise from the back of the roaster.
It goes away when I push the gear in, however it comes back after few minutes.
Any recommendations on what I should do to reduce the sound or make it go?
You need to un-tighten the two small Allen screws in the drum pulley - then move the pulley a tad towards the drum and tighten again. The pulley is touching the metal plates with the cut out…
From the online manual page 28:
Interesting. I will go over this and see. Thanks a bunch 
Somehow it stopped making that noise after opening the drum face and moving it a bit. I roasted few times and heard nothing, but who knows. I’m wondering about what you suggest here
You need to un-tighten the two small Allen screws in the drum pulley - then move the pulley a tad towards the drum and tighten again. The pulley is touching the metal plates with the cut out
Which two screws are you referring two? The ones close to the pulley in the image?
Debris and oily residue can attach between the 3 spacers and/or the end of the drum shaft and the bearing in the face plate. When you opened that, it’s possible some of whatever was there fell away and allowed the rear pulley to move foreward a tiny fraction to stop the noise.
I’ve had loud noises too but in my case it’s been broken bits of coffee beans. I haven’t had the noise you encountered which originates from the rear.
Bruce
I had this noise start in my Bullet yesterday in the middle of 15 roasts. Sure enough, when I got the roaster cooled down and opened up the back, I could see little metal shavings where the pulley was coming into contact with the chaff collector cover. I’m going to get that fixed, if only because the noise if awful.
