New lock cylinders are available as replacement components. When you replace a lock cylinder, apply a coating of appropriate lubricant inside the lock case and the cylinder keyway prior to installing the cylinder. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.
In order to repair a binding lock cylinder, refer to Lock Cylinder Binding . In order to code a new lock cylinder, refer to Key and Lock Cylinder Coding General Information.