Maintenance Fundamentals for Hydraulic and Pneumatic Power Systems (Tools, Stationary, and Mobile Equipment)

Preventative maintenance (PM)

Planned work done before something fails, including inspection, cleaning, lubrication, adjustments, and scheduled replacement of wear items.

Inspection

A structured search for early warning signs of failure, checking specific indicators such as leaks, damage, loose hardware, and abnormal operation.

Contamination

One of the most common root causes of valve sticking, seal wear, and pump damage, primarily due to dirt.

Ingress

The process of contaminants getting into equipment, which can cause failures.

Function check

The process of running and verifying normal operational parameters such as pressure and actuator motion after maintenance.

Lockout/tagout devices

Safety devices used to prevent unexpected energization of machinery and equipment during maintenance.

Injection injury

A severe injury resulting from high-pressure hydraulic leaks that penetrate the skin.

Torque wrench

A tool that applies a specified torque to fasteners and fittings to avoid damage.

Calibration

The process of comparing a measurement tool to a standard to verify and adjust its accuracy.

Filtration rating

The measure of how fine the particles a filter can remove from a fluid, critical for maintaining system health.

Fluid leakage

The escape of fluid from a system indicating possible underlying issues such as sealing problems or damage.

Pressure gauges / test kits

Tools used to verify system pressures and confirm the performance of pumps and compressors.

Cleaning

The act of removing contaminants to prevent issues such as valve sticking and pump damage.

PPE (Personal Protective Equipment)

Equipment worn to minimize exposure to hazards, ensuring safety during maintenance tasks.

Dirt ingress prevention

Measures taken to avoid contamination through cleaning and sealing during maintenance.

Belt tension adjustment

Modifying the tightness of a belt to ensure it operates efficiently without damaging adjacent components.

Air leaks

Audible leaks in pneumatic systems that waste energy and reduce actuator performance.

Regulator settings

Adjustments made to control the pressure in pneumatic systems, crucial for safety and performance.

Fluid condition inspection

Monitoring the state of fluids to identify issues such as contamination or degradation.

Emergency stop devices

Safety mechanisms that halt machine operation in case of an emergency.

Flow testing equipment

Tools used to evaluate hydraulic pump output and distinguish between low pressure and low flow problems.

O-ring groove cleaning

The process of cleaning sealing surfaces to prevent leaks by ensuring a good seal.

Waste handling procedures

Guidelines for the proper disposal of oily waste and used filters to prevent environmental contamination.

Stored energy hazards

Risks associated with pressure retained in systems even after powering down, requiring careful management.

Spill control equipment

Tools and resources such as absorbents and trays used to manage fluid spills and prevent environmental hazards.

Measurement accuracy

The exactness of measurement tools, critical for ensuring the reliability of maintenance operations.