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original equipment

Kobelco introduces SK350LC excavator

Kobelco Construction Machinery America has introduced its new SK350LC Acera Mark 8 hydraulic excavator. The new ex- cavator is powered by a 264-hp (197-kW) turbocharged elec- tronic fuel-injected Hino engine that is Tier 3 certified and de- livers 736 lb·ft (998 N·m).

Suitable for digging trenches, carrying and setting large pipe and trench boxes, backfilling, clearing sites, and loading trucks, the SK350LC has an operating mass of 79,600 lb (36,106 kg), digs to 24.8 ft (7.6 m), and reaches to 36.3 ft

(11.1 m) at ground line. It offers four power modes for heavy- duty excavation work, standard digging and loading work, breaker work, and demolition work with the crusher. The op- erator can change from one operating mode to another with a switch on the readout display. There is also a power boost switch that provides ready access to 10% more power on com- mand for increased bucket breakout force, without time limita- tions.

Smooth hydraulic response for very fine finishing and grad- ing applications is provided by an Independent Total Control System. A high-capacity hydraulic system allows the operator to adjust pump flow from the cab, and the standard high-flow valve can be switched from one-pump to two-pump flow to power attachments, mode selection switches, heavy lift switch- es, and independent travel switches.

The SK350LC’s ergonomically designed cab features large panels on all sides for optimized visibility, a seven-position sus- pension seat that adjusts to accommodate a wide range of operators, and a programmable climate-control system. All ma- jor controls are located on the operator’s right side for easy access. Viscous silicon cab mounts help to minimize vibration and shocks.

Kobelco’s new SK350LC hydraulic excavator offers a power boost switch that provides 10% more power on command for increased bucket breakout force with no time limitations.

All routine servicing and fluid checks can be performed from ground level, with access to filters, batteries, sight gaug- es, and couplers. The radiator, oil cooler, and intercooler are mounted side-by-side for easy access, but can be removed sep- arately for service.

Darlene Fritz

Bobcat adds two compact excavators

Contractors looking for a compact excavator have two new options to evaluate from Bobcat—the new 329, an entry-level compact excavator with conventional tail swing, and the 335, a compact excavator that offers the power and performance of a larger machine. ground level. The unit offers improved lifting ability, due to the conventional tail swing, as well as competitive arm and bucket forces for demanding applications. Company representatives say the Bobcat 329‘s hydraulic system will appeal to contractors because it provides improved control while digging. Featuring a dual-outlet piston pump that minimizes lugging, the 329’s hydraulic system enables it to maintain constant digging. A torque-limiting piston pump is able to sense and react to hydraulic loads for better utilization of the engine’s torque curve, and 14 gal/min (53 L/min) of auxiliary flow is also available. The unit’s two-speed travel system provides a 1.9-mph (3 km/h) high travel speed as well as a 1.2-mph (1.9 km/h) low travel speed. Turf-friendly 12.6-in (320-mm) wide rub- ber tracks distribute the 329’s 7098-lb (3220-kg) operating mass over a larger area to lower the ground pressure to 4.2 psi (28.7 kPa), thus helping to minimize dam- age to landscapes, paving stones, and other established areas. Steel tracks are also avail- able for harsher working environments. With an overall width of 61 in (1549 mm), the 329 is able to go in areas where larger excavators and tractor loader backhoes can- not. A hydraulic breaker or hydraulic clamp attachment is approved for use on the 329, which is useful for demolition applications, Powered by a 1.65-L, 27.7-hp (20.7-kW) liquid-cooled diesel engine, the 329 provides a maximum digging depth of 122.1 in (3100 mm) and a maximum reach of 191.9 in (4874 mm) at Bobcat’s new entry-level 329 compact excavator features a torque-limiting dual-outlet piston pump that provides smooth, predictable hydraulic control.

26 SAE OHE March 2007

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