JLG 400S

Sept. 28, 2010
The JLG 400S negotiates the Showcase's rough-terrain obstacle course.

JLG Industries, McConnellsburg, Penn., has built more 40-foot boom lifts for longer than any other company. In total, the company has delivered in excess of 40,000 40-foot gas/propane- or diesel-powered booms. The Model 400S is actually JLG's fifth-generation 40-foot boom, and along with its sister machine, the 460SJ, which features a 6-foot articulating jib, the two units make a powerful one-two product punch. The 400S demonstrated at the Boom Lift Showcase featured four-wheel drive and an optional oscillating axle, a feature the company pioneered back in 1981.

The 400S is a quick-operating machine, posting a swift 4.5-mph travel speed and equally impressive lift and rotation speeds. JLG is the only manufacturer to offer a dual-capacity load chart, which allows 500 pounds of unlimited capacity and 1,000 pounds of limited capacity. A 750-pound unlimited capacity option is available as well. Platform rotation of 180 degrees is standard.

The 400S utilizes a simple two-section boom and a basic, inverted-style, open, steel power track. A zinc-plated power track is available for coastal areas at an additional cost. Pivot pins are all nickel plated.

Located on the side of the platform is JLG's hallmark inward swinging entry gate. Multifunction controls are set wider apart to allow easier selection and limit accidental actuation by gloved hands. Information, such as fuel level and engine status, are also present here. Other platform features include a roto-molded workstation, which provides a good place to store small, loose items. There is also a pair of integral cup holders.

JLG's Advanced Design Electronics (ADE) system is incorporated into every facet of the machine's controls. This all-encompassing microprocessor-based operating system is the nerve center of the machine. A single CPU controls everything from engine and hydraulic functions, to monitoring the machine's safety system. The ADE system also has a sophisticated self-diagnostic capability that can be utilized via a small handheld analyzer. Technicians use the information presented in the LED readout and can refer to both print and online service manuals.

JLG is the only producer that does not have a boom interlock. When the boom is off-level more than 5 degrees, the operator is visually and audibly warned of the potential hazard, but operation is not suspended. The drive system is an efficient closed-loop hydrostatic type supplied by Sauer Sundstrand. Power is distributed equally through a pair of flow dividers. Bosch Rexroth proportional valves are commanded by controls produced by OEM Controls. Fairfield torque hubs are utilized, not only to provide superior power to the drive wheels, but also for the rotation of the superstructure. This planetary system has an integral multi-disc brake.

The 400S's engine and virtually every other component are mounted on the side of the machine under fiberglass hoods. Currently, owners can select one of three engine options, including a four-cylinder, 82-horsepower GM Vortec water-cooled gas/propane; a 50-horsepower Cat water-cooled; or the 49-horsepower Perkins 404C-22, which was installed in the Showcase machine. For improved serviceability, the engine pivots out. The combination of sound-baffling material fitted around the ABS cover helps hold the engine noise to 70 dBi. JLG has eliminated all but one grease point on the machine.

As with all JLG products, the 400S can be fitted with any one of the Workstation in the Sky work-platform tools. In addition to the 7,500-watt SkyPower generator, other options include the 250-amp SkyWelder welding packages, complete with welding leads strung into the boom, and the SkyCutter, with an on-board Miller Spectrum 375 CutMate.

With the number of unique features and optional accessories available on the 400S, it's no wonder that JLG continues to be a leader in 40-foot-boom-lift production.