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Boom lift is showcase of hydraulic versatility

Boom lifts are among the most rapidly advancing machines in the off-highway equipment market. Models that were considered advanced only a few years ago are already considered old school when compared to today’s designs with greater capabilities and features than ever before.

The hydrostatic drive of JLG’s 340AJ boom lift uses a variable-displacement axial-piston pump for smooth, infinitely variable control of drive speed and torque from simple Gerotor-type hydraulic motors.

Consider Model 340AJ boom lift from JLG Industries, McConnellsburg, Pa. The 340AJ achieves a lift height of 34 ft, a horizontal reach 20 ft, and an up-and-over reach of 17 ft. This is all accomplished with compact hydraulic cylinders and proportional direction valves for precise control and pressure-control valves that prevent sudden drops in the unlikely event of component failure. Furthermore, when hydraulic actuators are commanded to their stowed position, the 340AJ is only 2-m high and less than 2-m long.

In addition to its impressive reach capabilities, the 340AJ’s turret swings 355° and its 30- by 60-in. work platform can be hydraulically pivoted sideways 180° for maximum operator accessibility. But what makes the 340AJ as nimble at a construction site as it is on the warehouse floor is its powerful hydrostatic 4-wheel drive, which gives it a gradeability of 45%. Hydraulically articulated steering provides an inside turning radius of only 1.52 m.

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TAGS: Construction