The W11239857 is a genuine OEM washer drive belt used on many Whirlpool-family belt-driven VMW top-load washers. This belt transfers torque from the drive motor pulley to the splutch/drive system to produce agitation and spin. It’s a high-friction rubber belt engineered for controlled slip during start/stop and load balancing events. Common failures include glazing, stretching, cracking, rib wear, contamination from oil/grease, or belt slip caused by a worn splutch, damaged pulley surfaces, or a failing motor/bearing adding drag. Symptoms: no/weak agitation, no/weak spin, burning rubber smell, squeal on start, basket not reaching full RPM, or intermittent “won’t spin with load” complaints. IMPORTANT: If the belt is damaged, inspect the splutch and pulleys—belt failure is often secondary. CRITICAL: Unplug washer before servicing; tipping the unit requires safe handling.