If you've worked for long enough with hydraulic systems, you'll quickly discover that the performance of fluids is not constant. Temperatures fluctuate all day long, through seasons, and even between startup and full load. Every single one of these fluctuations can affect how fluids in your hydraulic system flow, and that's the point where viscosity index is among the top crucial and under-appreciated variables in selecting the right fluid.
If you've ever seen a hydraulic system struggle to control the actuator moving in a jerky manner, pressure spikes, or poor control of speed, the cause is usually the same: the valve that controls the flow of fluid is open or closed completely, and there is nothing else between. This kind of binary operation is fine for simple applications that require on/off; however, many modern hydraulic systems require some sort of more accuracy. This is where proportional valves step into the picture.
If you've ever taken down a hydraulic cylinder and set up a sealing kit onto your workbench, you've noticed none of the seals look exactly identical. Some are square-cut, others have lips, some U-shaped, and others look as if they could not possibly keep back the flow of fluid. That's intentional. Each seal profile within the hydraulic cylinder is designed to perform a specific task or location and a particular combination of motion and pressure conditions. If you confuse a rod seal and the piston seal when you reassemble them, you'll be returning to your workbench quicker than you'd prefer.
If you've ever sought hydraulic filters or identified a filter for a system of fluid power You've probably come across two terms on a datasheet: nominal micron rating and absolute micron rating. Both describe the size of particles captured; they typically appear side-by-side and may appear at first glance similar. However, they're fundamentally different things, and using the wrong specification as a reference point could make your system more vulnerable than you thought.
If you've ever pulled the cap of the reservoir on a hydraulic system and seen the liquid appearing milky white, light grey, or cloudy instead of its normal transparent reddish or amber tone, it's an indication of danger that should not be overlooked. The discoloration isn't just cosmetic; it's an indication that something's gone wrong in the system, and ignoring it or the need to address it could lead to increased damage, failure of components, and expensive downtime.
The lifting equipment and cranes work under conditions that expose each hydraulic component to the limits, such as dynamic loads, varied operating pressures, and extreme operating cycles, as well as environments that range across urban sites to offshore structures. The key to high-quality lifting performance is the valve for control, and choosing the wrong one for a mobile hydraulics system is among the most significant mistakes in specification the system designer could make.
It is a popular belief that technicians and operators of equipment that has hydraulic oil that is brand new and freshly extracted out of the bulk container or drum is safe and ready to use straight out of the container. It appears fresh and clean. It smells clean. The manufacturer claims it is in compliance with ISO standards. Why would anyone want to remove it from the filter before placing it in the hydraulic system?
