Brendan Casey

Founder and author,

Brendan Casey is the founder of and an author of several hydraulic maintenance and troubleshooting books. A hydraulics specialist with an MBA, he has more than 20 years experience in the design, maintenance and repair of mobile and industrial hydraulic equipment. Visit his website,, for more information.

Why Water and Oil Don’t Mix—and What to Do About It

If you’ve worked with hydraulic equipment for any length of time, it’s likely you’ve come across a hydraulic system with cloudy oil. Oil becomes cloudy when it is contaminated with water above its saturation level. The saturation level is the amount of water that can dissolve in the oil’s molecular chemistry and is typically 200 to 300 ppm at 20°C (68°F) for mineral hydraulic oil.

Eliminate Those Hydraulic Oil Leaks
Taking steps to prevent leaks not only drastically cuts oil costs and consumption, it’s an environmental imperative—one liter of leaked oil potentially pollutes up to one million liters of water.
Two Sound Reasons to Use a Multigrade Hydraulic Fluid
Higher system efficiency presents a strong argument for using multigrade hydraulic fluids, but their potential for improved machine productivity can have an even greater impact on your bottom line.
Use More Than Data To Determine Your Hydraulic Pump Life
How long should a hydraulic pump last in a given application? Going by past experience may be no better than guessing.
Slay the beast

In day-to-day operations of hydraulic equipment, you get the reliability you invest in. If, as an owner or operator, you tolerate unreliable hydraulic equipment and the operating conditions or design deficiencies that cause it, then you’ll only get more of the same. That’s why proper maintenance is key to keeping hydraulic systems running smoothly.

Cool, clean and dry: if only it was that easy

In order to maximize the service life of hydraulic equipment, all you need to do is keep the oil clean, cool and dry. It’s an old adage. And a simple one. But like most things hydraulic once you scratch the surface, there’s more to it than meets the eye.

Not only that, there’s an important first-step missing. It should be: Use the right oil and then keep it clean, cool and dry.

The next advance in hydraulics: Progress or regress? 2
Although hydraulic systems accommodate higher operating pressures, higher temperatures still wreak havoc on fluids and system components, such as seals and hose.
Careful design and selection can keep your hydraulic system from being a lemon
Careful consideration and selection of hydraulic components can help ensure your machinery runs long and successfully.
Getting the most from your maintenance dollars
Reliability Centered Maintenance and proactive methods help ensure the price of maintenance does not cost more than it is worth.
It’s all about location
Consider the pros and cons of each location when choosing where to include filters in a hydraulic system.
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