Hydraulic Filters and How To Monitor Them

Filter used on a filter cartContinuous monitoring of the filter elements in a hydraulic system can provide valuable clues to the performance of the filter and the condition of the system. But before discussing this, let’s consider some of the advantages and disadvantages of common filter locations in a hydraulic system.

Pressure filtration

Locating filtering media in the pressure line provides maximum protection for components located immediately downstream. Filtration rates of two microns or less are possible, due to the positive pressure available to force fluid through the media. Filter efficiency may be reduced by the presence of high flow velocities, and pressure and flow transients, which can disturb trapped particles.… continue reading »

How To Store Spare Hydraulic Cylinders

hydraulic cylinder failureA question I get asked a lot by equipment owners, is the procedure for storing spare hydraulic cylinders for an extended period. So here’s what I recommend:

–Always store fully retracted.
–Store indoors in a clean, dry area.
–Smear the internal surfaces of eye/clevis bushes or bearings with grease – particularly if they’re steel.
–Protect any exposed chrome on the rod. Petroleum jelly-impregnated tape such as Denso tape can be used for this purpose. Before applying, make sure the rod is fully retracted. N.B. if a product like Denso tape is applied to the rod when the rod is not fully retracted, subsequent retraction of the rod can result in damage to the rod seal.… continue reading »

Hydraulic Diagrams and Why You Need Them

hydraulic schematic drawingA picture is worth a thousands words. And so is an accurate diagram. It can also be worth a lot of nickel. Consider the four main types of hydraulic diagrams in common use — and the consequences of having to manage a hydraulic machine without them:

Block Diagrams show the components of a hydraulic circuit as blocks joined by lines, which indicate connections and/or interactions.

Cutaway Diagrams show the internal construction of hydraulic components and their flow paths. Because these diagrams typically use colors, shades or patterns in the lines and passages, they are very effective at illustrating different flow and pressure conditions.… continue reading »