KOBELCO Construction Machinery U.S.A. has added two straight boom excavators to its demolition equipment lineup, the SK300LC-11 and SK350LC-11. The company presents both as purpose-built demolition machines rather than general-purpose excavators adapted for attachment work.
The straight boom design is intended to deliver greater working height than conventional mono boom machines. KOBELCO says the configuration pairs increased reach and tool capacity with stability, controllability and operator comfort, and that both models are equipped to run a wide range of demolition attachments.
Engine and hydraulic package
Both machines use a 265-hp Isuzu Tier 4 Final engine with SCR/DEF emissions technology and no diesel particulate filter. KOBELCO states that the engine supplies the power and torque needed to operate heavy demolition attachments in demanding applications. A case drain circuit is fitted as standard, which the company says widens compatibility with attachments that require greater hydraulic drainage. An in-cab hydraulic pressure release function lets the operator bleed hydraulic pressure from inside the cab before disconnecting work tools or hoses, simplifying attachment changes.
Reach and tool capacity
The straight boom raises working height relative to conventional boom geometry while supporting substantial demolition tool capacities. Contractors can choose between standard and long arm configurations to balance reach against tool capacity, depending on the requirements of the application. KOBELCO lists maximum reach and maximum tool capacity for a standard and a long arm on each model:
- 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 cab is specified around long demolition shifts. A seven-way adjustable heated air-suspension seat moves with the armrests and hydraulic controls to help absorb shock and reduce operator fatigue, while redesigned pilot levers use shorter strokes and horizontal movement for precise, responsive control. A 10-inch colour monitor with a jog dial provides 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 settings for breakers, nibblers and rotating grapples can be adjusted through the monitor, and settings for additional attachments can be added or changed. Automatic climate control, Bluetooth hands-free audio, USB charging and LED-backlit controls are also included.
Protection and visibility
The cab incorporates a Roll-Over Protective Structure along with heavy-duty Level II top and front guarding intended for demanding demolition environments. Rear swing flashers and rear-facing work lights are integrated into the counterweight, and seven LED work lights come as standard: two mounted 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.
Telematics and warranty
KOBELCO KOMEXS 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. KOMEXS is included while a machine is covered by the factory warranty, and extended warranty coverage is available. Dan Collins, director of product development at KOBELCO Construction Machinery U.S.A., said the expansion reflects the company's commitment to purpose-built machines as the demolition industry evolves, adding reach and tool capacity while maintaining quality, comfort and controllability.