This year's Excavator Spec Guide ecompasses 29 of the major excavator suppliers and hundreds of the latest models. Although the spec information provided can tell you a great deal about the capabilities of the individual machines, selecting the right excavator for your fleet goes beyond comparing numbers. Many other factors can impact the optimum excavator choice, including the operating costs over the course of the work day. That's why we've asked excavator suppliers to provide a description of features specifically designed to enhance power and performance without sacrificing fuel economy. You'll find many of their responses included with the spec listings.
The Ditch Witch mini-excavators deliver increased power and performance with a closed loop hydraulic system. This system offers the ability of full power at low rpm. For their size, the MX models offer a synergy of power and simplicity of operation that make digging and backfilling easy. Featuring low ground pressure and greater bucket digging force, these well-balanced units can prepare everything from a small lot to a large service trench.
Volvo Construction Equipment
Volvo excavators feature an ergonomic operator's seat with multiple adjustments for individual comfort, lever consoles with vertical adjustment, easy-to-reach and easy-to-read controls, electronic climate control and greater visibility from the cab with a clear view in the digging direction. Immediate machine response to commands and optimum coordination between operator and machine allow for efficient and comfortable application.
TEREX compact excavators have hydraulics matched to the engine, allowing smaller engines to be used without compromising hydraulic efficiency and engine performance, while reducing fuel consumption. Load-sensing hydraulics with two in-line pumps help to maximize oil flow as the workload increases. Once the hydraulic oil reaches the factory preset pressure, pump No. 2 is dropped, leaving pump No. 1 to supply flow, resulting in lower demand on the engine to ultimately reduce fuel consumption.
Kobelco excavators use state-of-the-art components and design – including electronic injection, exhaust gas recirculation and turbocharging – to maximize the fuel's energy for work. In-line shaft-driven, variable-displacement pump technology, as well as advanced hydraulic system designs and techniques reduce the amount of energy lost. Good cylinder design results in the most efficient use of energy created in the form of hydraulic fluid flow and pressure. The cylinders on Kobelco excavators are sized to produce the appropriate amount of force and speed.
Doosan Infracore America Corp.
Doosan's load-sensing hydraulic system utilizes an E.P.O.S. (Electronic Power Optimizing System) to effectively manage fuel economy and power output. The new engines' torque curves deliver more power with equal or less fuel consumption. Doosan/Daewoo excavators also utilize a two-mode system. The standard power mode utilizes 85% of engine power for optimum fuel efficiency. For tough digging conditions, switch to power mode to obtain 100% of engine power.
Gehl's excavator hydraulic system components are properly matched and sized to deliver increased power and performance without sacrificing fuel economy. Calculating the right size, pressure and flow requirements are critical depending on the unit's physical size. To do this, you must know the physical power requirements and available engine space for a given unit and specify components accordingly. Efficient hydraulic systems can work in the correct operating ranges of engines to maximize fuel efficiency.