The Hörmann D437347 Rail Repair Kit is a genuine replacement solution for restoring the opener rail on Hörmann residential garage door systems designed for 7 ft to 8 ft door heights. Built for service and maintenance tasks, this rail repair kit helps correct rail damage or misalignment that can cause noisy operation, binding, or irregular trolley travel. Using the manufacturer part number ensures you’re matching the correct repair kit to your Hörmann rail assembly for sectional overhead doors commonly found in residential applications.
Intended for select Hörmann opener and rail combinations used in North America, this is not a universal retrofit. Confirm compatibility by referencing D437347 in your opener’s parts diagram or service manual before ordering. Installation typically involves removing load from the opener, aligning the rail, securing the rail joints, and checking chain or belt tension, followed by verifying or re-learning travel limits on the operator if needed. For safety, disconnect power, use the manual release, and be mindful of door spring tension; servicing springs should be performed by qualified personnel. Ideal for technicians and experienced DIY users, this Hörmann rail repair kit supports reliable, smooth opener performance on 7 ft to 8 ft residential sectional doors.