EDEN PRAIRIE, Minn. … Diversified industrial manufacturer Eaton Corporation has added a hydro-mechanical torque control option and several performance upgrades to its successful 420 Series product line. The new 420 HM pumps with hydro-mechanical torque control are intended for moderate-flow, high-pressure mobile applications on vehicles such as compact wheel loaders, telehandlers, rough terrain forklifts, telescopic booms, sweepers, backhoe loaders, and garbage trucks.

With a maximum pressure rating of 280 bar, 420 Series pumps offer outstanding power density delivering up to 118 hp at 3,000 rpm. Standard control options include pressure compensation and load sensing pressure and flow compensation.

The new power/torque control works in parallel with the standard compensator using a special mechanism to replace the control piston. The effect is to limit power consumption by the pump while providing maximum flow at a pressure equal to the desired power level. The system provides maximum pressure at reduced flow, and avoids a corner horsepower point.

420 Series pumps have been extensively re-engineered to reduce noise levels (76 dBA at 1,800 rpm and 207 bar) while improving reliability and operating efficiency. The compensator has been changed to reduce an infrequent system-induced noise.

The housing has been extensively re-designed to decrease airborne noise while allowing more options than the previous configuration. A case to inlet check valve has been added to improve cold weather operation and limit case pressure spikes to protect seals and the rotating group. As a result, 420 Series pumps have fewer parts, fewer bolts, and fewer leak joints than previous models, and use highly reliable O-ring seals throughout.

Eaton’s Hydraulics Operations is a business segment of Eaton’s Fluid Power Group. The business is a worldwide leader in the design, manufacture and marketing of a comprehensive line of reliable, high-efficiency hydraulic systems and components for use in mobile and industrial applications. Mobile and industrial markets include agriculture, construction, mining, forestry, utility, material handling, earthmoving, truck and bus, machine tools, molding, primary metals, automotive, power generation, port machinery and entertainment. Eaton’s Hydraulics Operations provides customer-driven solutions under brand names such as Aeroquip®, Boston®, Char-Lynn®, Eaton®, Hydro-Line®, Vickers® and Weatherhead®. For more information, visit www.hydraulics.eaton.com.

Eaton Corporation is a diversified industrial manufacturer with 2007 sales of $13.0 billion. Eaton is a global leader in electrical systems and components for power quality, distribution and control; fluid power systems and services for industrial, mobile and aircraft equipment; intelligent truck drivetrain systems for safety and fuel economy; and automotive engine air management systems, powertrain solutions and specialty controls for performance, fuel economy and safety. Eaton has 70,000 employees and sells products to customers in more than 150 countries. For more information, visit www.eaton.com.

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