Garage door opener carriage assemblies attach to the garage rail to connect the door to the garage door opener. The trolley carriage sits on the rail and uses a belt, chain, or cable to pull the garage door open or lower it closed when the operator activates. Chain drive garage door openers, screw drive operators, and belt drive garage door openers all require trolleys to operate.
These genuine heavy-duty LiftMaster replacement carriages are for a variety of LiftMaster garage door operators. Trolley Carriage Assemblies are essential hardware for keeping an overhead doors in working condition. If your door is having trouble opening/closing and there are no mechanical problems with the garage door operator, a carriage assembly may need to be replaced to fix the door. Carriage assemblies from Action Industries come with all the garage door parts required for a DIY garage door opener trolley installation.