The Genie 18428D.S Chain Assembly 8' is a genuine OEM replacement for the Genie model 522P chain-drive garage door opener. Engineered for an 8-foot door application, this chain assembly transfers power from the opener to the trolley to open and close residential sectional garage doors smoothly and reliably. It is designed as a direct-fit service part for the 522P, making it an ideal solution when the original drive chain has stretched, worn, or been damaged, and helps restore proper travel and consistent performance.
Identified by Genie part number 18428D.S, this chain assembly is intended specifically for the 522P and its corresponding rail system; it is not interchangeable with belt-drive or screw-drive models. Installation typically involves disconnecting power to the opener, relieving chain tension, swapping the assembly, and re-tensioning per the Genie owner’s manual so the chain has slight slack and the door travels the full distance without binding. For safety and best results, verify door balance before adjustment and follow all Genie instructions for the 522P regarding chain tension, limit settings, and travel calibration. This OEM replacement part supports dependable day-to-day use in residential environments and maintains the designed performance of the Genie 522P chain-drive system.