41C4398A Liftmaster RPM Sensor Assembly
The RPM interruptor cup spins through the u-shape on the RPM sensor and counts the revolutions when the motor starts. If the opener trolley only moves a few inches then it's possible the RPM sensor is not working properly. There are other possible causes for the trolley to only move a little bit but the RPM sensor is one of the things that should be checked when diagnosing a problem with the opener. Compatible with various Liftmaster and Raynor openers made after 1995 (see list below).
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