Fluid Power Journal

How to Determine Hydraulic Pump Condition Using Volumetric Efficiency

Hydraulic pumps convert mechanical energy into hydraulic energy. A high-performance piston pump can make this conversion with an overall efficiency of 92%. If …

How to Correctly Interpret Case Drain Flows in Hydrostatic Transmissions

When a pump or motor is worn or damaged, internal leakage increases and therefore the flow available to do useful work decreases. This means that the condition …

The Real Value Of Hydraulic Circuit Diagrams

Like many readers of this Journal, I’m regularly involved in troubleshooting problems with hydraulic equipment. When in these situations, there are two …

Proactive Maintenance 101: Define Your TOW!

The most important proactive maintenance exercise you can do for a piece of hydraulic equipment is to define its temperature operating window (TOW) and then …

How to Solve Hydraulic System Overheating Problems

Based on polls I’ve conducted with my Hydraulics Pro Club members over the years, overheating ranks number two in the list of most common problems with …

The Negative Effects of Over-Pressurization

Power transmission in a hydraulic system is a product of flow and pressure. It follows that the power rating of a hydraulic pump or actuator is a product of …

Troubleshooting: Science or Black Art?

The increasing complexity of today’s hydraulic equipment means there is a lot to know about proactive maintenance to achieve optimum reliability. It’s my …

Which Hydraulic Fluid?

Most hydraulic systems will operate satisfactorily using a variety of fluids. These include multigrade engine oil, automatic transmission fluid, and more …

Analysis of a Hydraulic Oil Failure

I recently conducted failure analysis and a reliability audit on a 300-kilowatt (400-hp) hydrostatic transmission. This hydraulic system was running a …

Conductor Face-Off: Hose Versus Tube

What do lifting chains, bladder-type accumulators, and hydraulic hoses all have in common? Well, they typically have only one mode of failure—and that’s …

Sponsor

Sponsors


Get Our E-News!