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Skyjack’s SJ 40T and SJ 45T boom lifts offer innovative design features such as an analog based control system and relay based electrical system. The axle based 4WD system offers unsurpassed traction and terrainability; using a “Detroit Locker” type differential on the rear axle and limited slip differential (sometimes referred to as Posi-trac) on the front oscillating axle, ensures the least amount of power loss when one or more of the wheels lose traction. Skyjack’s hallmark control and electrical systems, together with an axle based 4WD system, are only a few examples of how Skyjack keeps serviceability and life cycle costs in mind. These models are also packed full of innovative, service friendly features, such as the unique central grease points at the rear of the turret for quick and easy maintenance, as well as easy to adjust (and lock) rotation deflection adjustment located inside the engine side cabinet. The SJ 40T and SJ 45T also feature SkyJack”s exclusive Direction Sensing controls, which ensure the boom lift will always drive and steer with respect to the operator rather than the orientation of the base.