CLS Study Guide 2026

The thickener forms a three-dimensional matrix or sponge-like structure that holds the base oil in place and releases it under shear during lubrication.

The purge and replace method ensures that incompatible old grease is completely removed from the bearing housing before introducing the new grease type, preventing softening, hardening, or oil separation caused by incompatible thickener chemistry.

Lubricant additives are chemical compounds blended into the base oil to enhance existing properties or impart new ones. They play crucial roles such as improving anti-wear capabilities, preventing rust and corrosion, inhibiting oxidation, dispersing contaminants, and modifying viscosity, all of which contribute significantly to the lubricant's overall performance and the protection of machinery.

Equipment manufacturers provide specific guidelines for lubrication system checks and maintenance intervals based on the machine's design, operating conditions, and the type of lubricant used. Adhering to these recommendations ensures optimal performance, prevents premature wear, and maintains warranty validity, as the manufacturer has thoroughly tested and determined the ideal maintenance schedule for their equipment.

Anti-wear additives form a protective chemical film on metal surfaces, particularly under conditions of high pressure and boundary lubrication where the lubricant film might be too thin to completely separate the surfaces. This film prevents direct metal-to-metal contact, thereby minimizing abrasive and adhesive wear and extending the life of components.

Lubricant consolidation reduces SKU count, cross-contamination risk, inventory complexity, and training burden without compromising machine protection.