Hydraulic power is a very useful part of industrial machine operation, but it is a mystery to most plant technicians and engineers. There is very little formal training, and most people are given the responsibility of maintaining and upgrading the equipment without the proper tools to handle the job. To ensure they have the right hydraulic system, they must rely on the supplier who provides the unit. This article will not make you a system design expert, but it will increase your understanding of what will make your systems more reliable.