Kobelco Construction Machinery U.S.A. has added the SK300LC-11 and SK350LC-11 Straight Boom excavators to its demolition equipment lineup. The company said the machines are purpose-built for demolition and are designed to provide greater working height than conventional mono-boom excavators while combining reach and tool capacity with stability, controllability and operator comfort.
Both models use a 265-hp Isuzu Tier 4 Final engine with SCR/DEF emissions technology and no diesel particulate filter. Kobelco said the engine supplies the power and torque needed to run heavy demolition attachments in demanding applications. A case drain circuit is standard, extending compatibility with attachments that require additional hydraulic drainage.
The straight-boom configuration increases working height compared with conventional boom arrangements and supports substantial demolition tool capacities. Contractors can choose standard or long arm configurations to balance reach against tool capacity. Kobelco's published figures list a 10-foot 2-inch arm with 36-foot maximum reach and 8,708-pound maximum tool capacity; a 13-foot 1-inch arm with 39-foot reach and 7,959-pound capacity; a 10-foot 10-inch arm with 37-foot reach and 10,825-pound capacity; and a 13-foot 7-inch arm with 39-foot reach and 9,348-pound capacity.
Attachment changes are supported by an in-cab hydraulic pressure release function. It allows the operator to release hydraulic pressure from inside the cab before disconnecting work tools or hydraulic hoses. Hydraulic flow settings for breakers, nibblers and rotating grapples can be adjusted through the cab monitor, and settings for additional attachments can be added or changed to suit the operator and application.
Operator cab and jobsite visibility
The cab includes a seven-way adjustable heated air-suspension seat that moves with the armrests and hydraulic controls to help reduce fatigue and absorb shock. Redesigned pilot levers have 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.
Cab amenities include automatic climate control, Bluetooth hands-free audio, USB charging and LED-backlit controls. For protection in demolition environments, 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 integrated into the counterweight. Seven LED work lights come standard: two boom-mounted lights, two at the front of the cab, one on the right side and two rear-facing units in the counterweight.
Monitoring and warranty
The KOBELCO KOMEXS system gives owners and fleet managers remote access to operating hours, fuel consumption, maintenance status and machine location. It also includes an engine start alarm, geofencing and current and historical location information. KOMEXS is included while the machine is covered by the factory warranty, and extended warranty coverage is available.
Dan Collins, director of product development for Kobelco Construction Machinery U.S.A., said the demolition industry continues to evolve and that the company is committed to purpose-built machines addressing contractors' changing needs. He said the lineup expansion reflects that commitment through increased reach and tool capacity, along with quality, comfort and controllability.