A Pump that Tolerates Torsional Vibration

Oct. 8, 2015
Parker Hannifin's Gold Cup pumps and motors underwent extensive instrumentation and analysis, which led to new Severe and Extreme barrel bearing designs.
Gold Cup pumps and motors, right, manufactured by Parker Hannifin’s Hydraulic Pump Div., recently underwent extensive instrumentation and analysis to understand reported field issues. Technicians determined that torsional vibration related to new engines and unique load conditions were impacting pump and motor performance.

These findings led Parker to develop a new barrel bearing design (middle) that can withstand severe driveline torsional vibration conditions. Parker’s pump designers revised this already-rugged bearing’s configuration and cage to double its strength. A new Severe Duty bearing is now available for Parker’s size 6, 7, and 8 Gold Cup pumps and motors.

Parker’s Gold Cup pumps and motors now come in versions designed to tolerate the high torsional vibration inherent to diesel engines. One solution is a severe -duty option, top, which uses a barrel bearing with a larger, thicker, and more robust cage (which keeps rollers equally spaced) for twice the strength of a standard barrel bearing. An Extreme Duty option, bottom, uses a single-piece bronze cage that provides the industry’s highest strength and lowest friction. Click on image for larger view.

A second development concerns an Extreme Duty version (bottom), which uses a single-piece bronze cage for higher strength and low friction for running low-viscosity and unconventional fluids. Available in all Gold Cup sizes, this bearing design is intended for heavy-duty applications in the mining, forestry, oil and gas, and military industries.

Steve Gluck is Technical Support Engineering Team Leader at Parker Hannifin’s Hydraulic Pump Div., Marysville Ohio. Call (937) 644-3915, or visit

Matthew Witter is Principal Engineer and founder of Structural Dynalysis Ltd., Cincinnati. For more information, call (513) 258-1974, or visit

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