Edle,
The noise you are referring to is caused by a dirty, or worn out belt. clean it with wipes. Put the newly cleaned belt in a plastic pouch with corn starch or foot powder. Shake the pouch and take belt out and re-install. This should be done at least every 3 months. However if belt belt in already yellowish in color, it is time to replace. The newer nitrile (black) belts are much better but needs to be cleaned too.
The noise you are referring to is caused by a dirty, or worn out belt. clean it with wipes. Put the newly cleaned belt in a plastic pouch with corn starch or foot powder. Shake the pouch and take belt out and re-install. This should be done at least every 3 months. However if belt belt in already yellowish in color, it is time to replace. The newer nitrile (black) belts are much better but needs to be cleaned too.