Kobelco Adds SK300LC-11 and SK350LC-11 Straight Boom Demolition Excavators

Kobelco has expanded its demolition lineup with two purpose-built machines: the SK300LC-11 Straight Boom and the SK350LC-11 Straight Boom. Both sit on the Generation 11 excavator platform and are engineered for demanding low- to mid-level structural demolition rather than general earthmoving.

The straight boom geometry is the point of the design. Compared with a conventional mono boom, it gives more working height and lets the machine carry bigger demolition tools higher up, which is what contractors need when taking down walls, elevated structures and industrial buildings.

Reach and tool capacity

Kobelco publishes two arm options per model, and the trade-off between reach and tool weight is clear in the numbers:

• SK300LC-11: with the standard 10 ft 2 in arm, 36 ft maximum reach and 8,708 lb maximum tool capacity; with the long 13 ft 1 in arm, 39 ft reach and 7,959 lb.
• SK350LC-11: with the standard 10 ft 10 in arm, 37 ft reach and 10,825 lb maximum tool capacity; with the long 13 ft 7 in arm, 39 ft reach and 9,348 lb.

Operating weight is about 71,400 lb (32,400 kg) for the SK300LC-11 and roughly 81,800-85,300 lb (37,100-38,700 kg) for the SK350LC-11, depending on configuration. Both are powered by an Isuzu 6HK1 Tier 4 Final engine rated at 266 hp (198 kW) net, using SCR/DEF aftertreatment with no diesel particulate filter.

Attachment-ready hydraulic package

Two details matter to anyone who runs breakers, nibblers or rotating grapples. A case drain circuit is standard, which widens compatibility with attachments that need increased hydraulic drainage - on many machines this is a retrofit line item. Kobelco also puts a hydraulic pressure release function inside the cab, so the operator can bleed pressure before disconnecting hoses instead of working at the coupling.

Cab, guarding and telematics

The demolition cab carries ROPS plus heavy-duty Level II top and front guarding, a specification buyers often have to add later on standard machines. A three-camera system feeds a 270-degree view onto a 10-inch monitor, which also handles attachment flow settings and maintenance data. Seven LED work lights are standard, with rear-facing lights and swing flashers integrated into the counterweight.

Kobelco's KOMEXS telematics gives owners and fleet managers machine hours, fuel consumption, maintenance status, location history and geofencing.

What buyers and parts managers should take from this

• Spec sheets travel with the machine. When these units reach the second-hand market in a few years, the straight boom configuration, case drain circuit and Level II guarding will be the value drivers - verify them on the build sheet, not the paint.
• Tool capacity sets the attachment budget. A 10,825 lb limit on the SK350LC-11 means a bigger breaker class than a standard 35-tonne excavator is built to swing, and that changes hose, seal and mounting-wear consumption.
• Heavier class, heavier undercarriage wear. At 37-39 tonnes working weight, track chains, rollers and shoes become the dominant running cost; budget accordingly when quoting operating hours against price.

For overseas buyers comparing used demolition units, the practical check is simple: confirm the guarding level, the case drain plumbing and the telematics history before agreeing a price, because retrofitting any of the three costs far more than the price gap between two otherwise similar machines.

Source: EquipmentWorld, KOBELCO Construction Machinery U.S.A. product data and Heavy Equipment Guide, October 2026. Image: KOBELCO.