KOBELCO Construction Machinery U.S.A. has expanded its demolition equipment range with the SK300LC-11 and SK350LC-11 Straight Boom excavators. The two machines are designed to give contractors more working height than conventional mono-boom excavators while combining reach and attachment capacity with stability, control and operator comfort. KOBELCO said both models are purpose-built for demolition and can work with a broad selection of demolition attachments.
Engine and hydraulic package
Both excavators use a 265-hp Isuzu Tier 4 Final engine with SCR/DEF emissions aftertreatment and no diesel particulate filter. According to KOBELCO, the engine supplies the power and torque needed for heavy demolition attachments in demanding applications. A case drain circuit is standard, which widens compatibility with tools that require greater hydraulic drainage. The machines also include an in-cab hydraulic pressure-release function; this lets the operator relieve pressure before disconnecting work tools or hydraulic hoses, simplifying attachment changes.
Reach and tool capacity
The straight-boom layout is intended to raise working height compared with conventional boom configurations while still supporting substantial demolition tool capacities. Contractors can choose standard or long arm configurations to balance reach against tool capacity for the job at hand. The announced arm configurations include:
- 10-foot 2-inch arm: 36-foot maximum reach and 8,708-pound maximum tool capacity
- 13-foot 1-inch arm: 39-foot maximum reach and 7,959-pound maximum tool capacity
- 10-foot 10-inch arm: 37-foot maximum reach and 10,825-pound maximum tool capacity
- 13-foot 7-inch arm: 39-foot maximum reach and 9,348-pound maximum tool capacity
Cab and controls
The operator cab is designed around comfort and control in demolition conditions. A seven-way adjustable heated air-suspension seat moves with the armrests and hydraulic controls, a design KOBELCO says helps absorb shock and reduce fatigue. Redesigned pilot levers use shorter strokes and horizontal movement for precise, responsive control. A 10-inch colour monitor and jog dial provide access to machine settings, attachment flow adjustments, maintenance information and fuel-consumption data. The monitor also shows a 270-degree view from the standard three-camera system. Hydraulic flow settings for breakers, nibblers and rotating grapples can be adjusted through the monitor, and settings for additional attachments can be added or changed.
Cab amenities include automatic climate control, Bluetooth hands-free audio, USB charging and LED-backlit controls.
Protection, visibility and telematics
For demolition sites, the cab has a Roll-Over Protective Structure and heavy-duty Level II top and front guarding. Rear swing flashers and rear-facing work lights are built into the counterweight to improve visibility around the machine. Seven LED work lights come standard: two on the boom, two at the front of the cab, one on the right side and two rear-facing units in the counterweight.
The KOBELCO KOMEXS monitoring system gives owners and fleet managers remote access to operating hours, fuel consumption, maintenance status and machine location. It also offers an engine start alarm, geofencing and current and historical location data. KOMEXS is included while the machine is covered by the factory warranty. Both models carry KOBELCO's standard machine warranty, and extended coverage is available.
Dan Collins, director of product development for KOBELCO Construction Machinery U.S.A., said the expansion reflects the company's focus on purpose-built machines as demolition work changes. He cited reach, tool capacity, comfort and controllability as priorities for the new models.