Sharp Replacement Belt BU-3...
$6.99
Product details
Sharp's BU-3 belt drives the brush roll on the company's upright vacuums, and part 17399 is the replacement. It covers a long run of machines: the EC-12SX2, EC-12SXT5, EC-12TBC, EC-12TX8B, EC-14TWT6, EC-14TWT9, EC-14TX6B, EC-14TXT6 and EC-14TXT9, along with the EC-S2720, EC-T2650, EC-T2840, EC-T4660, EC-T4765 and EC-T4840, and the EC-TU series from the TU2608 through the TU5965.
What you notice when it is worn is not noise but poor cleaning. A stretched, glazed belt lets the roller slip whenever the bristles dig into carpet, so the machine skims instead of agitating.
Look the belt over every few months and replace it at the first sign of glazing or cracking rather than waiting for it to break. Fitting takes a screwdriver and a few minutes with the bottom plate off.

