Large Work Envelope on JLG Boom Lift Increases Job Site Accessibility

Mon June 02, 2008 - National Edition
Construction Equipment Guide

The JLG Model 1350SJP has a platform height of 135 ft. (41 m) and 80 ft. (24 m) of horizontal reach, which allows it to reach up to 50 percent more area than boom lifts with a 125-ft. (38 m) platform height. JLG’s JibPLUS 8-ft. (2.4 m) jib boom can move both vertically and horizontally for improved access to hard-to-reach areas.

Adding to worker utility is the 1,000-lb. (453 kg) restricted platform capacity that can be used over the majority of the work envelope; unrestricted platform capacity is 500 lbs. (227 kg). An Automatic Capacity Control system adjusts the work envelope to match the selected load.

Efficient operation and operator comfort also have been engineered into the boom lift by incorporating an electronic platform leveling system and swing speed proportioning. With the leveling system, the platform is automatically leveled in relation to gravity, not the machine chassis, so the operator is always working or driving the machine from a level surface.

Swing speed proportioning maintains a constant platform swing speed as the boom rotates horizontally regardless of the boom radius. As the boom lengthens, speed is reduced so the platform is always moving at a constant rate.

Another feature of the Model 1350SJP boom lift is the controlled arc work envelope. The system manages boom movement as it is raised and lowered through a smooth vertical arc. This provides a much larger work envelope than comparable machines, increasing the points of access for the operator.

With this proportional system, as the boom is extended and raised, the platform is automatically kept within the work envelope. Conversely, as the boom is lowered, it is automatically retracted to keep it within safe operating parameters. It maintains the same percentage of boom extension throughout the work envelope; and when starting or stopping, boom motion is gradual so platform motion is smoother.

Advanced operational features that are standard on the Model 1350SJP boom lift include an oscillating axle with 12 in. (30 cm) of movement for a smoother ride, four-wheel drive using two hydraulic drive pumps for improved traction with 45 percent gradeability, and four-wheel steering with the operator’s choice of front wheel, crab or four-wheel coordinated steering. A proportional control system allows wheels to stay synchronized and tailors the maximum drive speed to the radius of the turning angle. Drive-out extendable axles require a smaller area to extend, and all steering modes are available during extension.

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