The LiftMaster 3950CG Chain Guard is the factory chain cover for the LiftMaster model 3950 commercial door operator, commonly installed on rolling sheet and roll-up doors in self-storage and light commercial facilities. This OEM replacement part encloses the operator’s exposed drive chain and sprocket to help reduce snag hazards, protect users, and keep debris away from critical moving components, helping the 3950 run smoothly and reliably in everyday service.
Designed as a direct-fit replacement, the 3950CG mounts to the existing attachment points on the LiftMaster 3950 operator head, restoring the original guarding when the cover is missing or damaged. For installation and service, disconnect power and follow lockout/tagout procedures; verify chain alignment and tension, secure all fasteners, and ensure the guard does not interfere with door travel before returning the unit to operation. This part is intended specifically for the LiftMaster 3950 commercial operator and is not interchangeable with other models such as 3900, LJ8950W, MJ, or J-series units. It is a practical replacement part for commercial roll-up door applications where guarding of moving parts is required by jobsite safety practices.