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One of the most important functions of the complete elevator system is the smooth and safe operation of the car and hoistway door package. The doors need to be hung square, plumb and level. They need to be free of all mechanical binds, dirt and oil. The rewards of a good quality installation will be fewer callbacks and a reduction in maintenance expenses. This will increase the life of the doors and door operator and provide many years of trouble-free service for both the customer and the elevator maintenance company.