The Genie 37857R.S Tensioner Assembly is a genuine OEM replacement component designed for select Genie residential garage door openers. This assembly maintains proper tension in the drive system, helping ensure smooth, reliable door travel and reducing noise or slippage that can occur when the drive loses tension. It replaces a worn or damaged tensioner on compatible Genie rail systems and is commonly used when the opener belt or chain shows inconsistent movement, chatter, or irregular travel.
Positioned on the opener rail, the tensioner provides adjustable take-up to set correct drive tension according to the model’s service instructions. For compatibility, match part number 37857R.S with the parts diagram or owner’s manual for your specific Genie model and rail style. Installation should be performed with the door closed and disconnected from power; release the opener from the door, relieve drive tension per the manual, replace the assembly, and adjust tension to specification before testing safety reversals. This OEM Genie tensioner assembly is intended for use on applicable Genie garage door opener systems and is a direct-fit replacement part for maintenance or repair on compatible residential installations.