Humming/Rattle After Blower Wheel Replacement - GE Dryer

I hope someone can help with this. I have a GE dryer with model # DVL223EB4WW . I had a broken blower wheel assembly that I just replaced. When I restarted the dryer following the repair, the dryer ran perfectly for about 3-5 minutes but then started humming/rattling. I shut off the dryer and removed the drum to lubricate the rear drum bearing and idler pulley thinking that was the issue. I also made sure there were no loose screws and that the blower wheel was turning smoothly. Everything looks fine.
However, I still get a hum/rattle after 3-5 minutes when I restart the machine. Any suggestions? Thanks in advance.