Specifications include, but are not limited to: 55-foot articulating over center aerial device, for installation over rear axle, built in accordance with these standard specifications and to include the following features: A. Ground to Bottom of Platform Height: 56 feet B. Working Height: 61 feet C. Minimum Reach to Edge of Platform with Upper Boom Overcenter: 48.8 feet D. Maximum Reach to Edge of Platform with Upper Boom Nonovercenter and Lower Boom at 124: 43.5 feet at 25.7 foot platform height E. Pedestal and Turntable: Box structure design with large service openings, 1.55 inch top plate of pedestal and stiffened 1.55 inch bottom plate of turntable machined after welding to provide a rigid, flat mounting surface for the rotation bearing. F. Rotation: Continuous rotation provided by worm gear drive, equipped with extended shaft for manual rotation, driving a shear ball bearing rotation gear. The fully adjustable rotation drive assembly includes an external eccentric ring adjustment of the gearbox pinion gear to the main rotation bearing, permitting the ability to easily adjust backlash, reduce boom side play and ensure proper tooth contact over the life of the unit. This reduces life cycle cost.