Replaced a failed blower motor on a Trane XR90 furnace. Disconnected and locked out power supply before removal. Installed a compatible X13 model Emerson blower motor with adjustable speeds. Realigned belt and pulleys on new motor. Sealed combustion air inlet with RTV silicone. Restored power and verified proper airflow across A-coil. Cycled heating sequences to confirm safe operation before leaving site.