The LiftMaster K10-10013 Limit Nut Retainer is a genuine OEM replacement component designed for select LiftMaster commercial door operators that use a mechanical linear limit system. Its job is to securely hold the open and close limit nuts in position on the threaded limit shaft, helping the operator stop the door precisely at the programmed travel endpoints. Replacing a worn, broken, or missing retainer restores reliable limit control and prevents unwanted drift, supporting smooth, consistent operation in demanding commercial and industrial applications.
Installation is mechanical and should be performed with power removed and proper lockout/tagout in place. Access the operator head, locate the limit assembly, replace the damaged retainer, and verify/adjust the open and close limits per the specific operator manual. No programming is required; however, the limits must be checked and cycled for accuracy after service. This is not a universal part—confirm compatibility by matching the part number K10-10013 with your LiftMaster model’s parts diagram or service documentation. For safety and performance, service should be performed by qualified personnel, as an improperly secured limit assembly can allow over-travel and cause equipment damage.