PMMI Fluid Power Exam Practice 2026 – Complete Study Guide

A pressure gauge measures the pressure within a hydraulic system, providing essential information about the system's current state. Pressure is a critical parameter in hydraulics because it determines the force that can be exerted by the hydraulic fluid. The gauge typically displays pressure in units such as pounds per square inch (PSI) or bar, allowing operators to evaluate whether the system is operating within safe and effective limits.

Understanding pressure is vital for operational safety and efficiency. If the pressure is too low, it may indicate potential issues such as leaks or insufficient fluid, which can lead to system failure. Conversely, excessively high pressure can cause equipment damage or failures, posing safety risks. This makes monitoring pressure with a gauge a fundamental practice in the maintenance and operation of hydraulic systems.