KOBELCO Construction Machinery U.S.A. has widened its demolition equipment range with two straight-boom excavators, the SK300LC-11 and SK350LC-11, which the manufacturer describes as purpose-built demolition machines rather than general-purpose excavators adapted to the task.
Straight boom for working height
The straight-boom layout is intended to give operators more working height than a conventional mono-boom machine, combining longer reach and larger tool capacity with stability, controllability and operator comfort. Both models are set up to carry a range of demolition attachments.
Engine and hydraulic package
Power comes from a 265-hp Isuzu Tier 4 Final engine using SCR/DEF emissions technology and no diesel particulate filter. KOBELCO says the engine supplies the power and torque required to run heavy demolition attachments in demanding applications.
A case drain circuit is fitted as standard, broadening compatibility with attachments that need greater hydraulic drainage. An in-cab hydraulic pressure release function also lets the operator bleed off hydraulic pressure from the seat before disconnecting work tools or hoses, simplifying attachment changes.
Contractors choose between standard and long arm configurations to balance reach against tool capacity. The figures published with the launch are:
- Standard 10-foot 2-inch arm: 36-foot maximum reach and 8,708-pound maximum tool capacity
- Long 13-foot 1-inch arm: 39-foot maximum reach and 7,959-pound maximum tool capacity
- Standard 10-foot 10-inch arm: 37-foot maximum reach and 10,825-pound maximum tool capacity
- Long 13-foot 7-inch arm: 39-foot maximum reach and 9,348-pound maximum tool capacity
Cab and controls
The operator station is built around a seven-way adjustable heated air-suspension seat that moves with the armrests and hydraulic controls, a design intended to cut fatigue and absorb shock. Redesigned pilot levers use shorter strokes and horizontal movement for finer control.
A 10-inch colour monitor with a jog dial gives access to machine settings, attachment flow adjustments, maintenance information and fuel consumption data, and displays a 270-degree view from the standard three-camera system. Hydraulic flow for breakers, nibblers and rotating grapples can be tuned through the monitor, and settings for further attachments can be added or changed. Automatic climate control, Bluetooth hands-free audio, USB charging and LED-backlit controls are also included.
Protection and jobsite visibility
The cab combines a Roll-Over Protective Structure with heavy-duty Level II top and front guarding aimed at demolition environments. Rear swing flashers and rear-facing work lights are built into the counterweight, and seven LED work lights come as standard: two on the boom, two at the front of the cab, one on the right side of the machine and two rear-facing units in the counterweight.
Monitoring and warranty
KOBELCO's KOMEXS system gives owners and fleet managers remote access to operating hours, fuel consumption, maintenance status and machine location, along with an engine start alarm, geofencing and current and historical location data for equipment spread across multiple sites.
Both models carry KOBELCO's standard machine warranty, with KOMEXS included while the machine remains under factory warranty; extended coverage is available. Dan Collins, director of product development for KOBELCO Construction Machinery U.S.A., attributed the expansion to the company's stated commitment to purpose-built machines as demolition contractors' requirements change, pointing to reach, tool capacity, comfort and controllability.