Contaminants such as water, particles, air, fuels, cleaning chemicals or incorrect media accelerate oxidation, additive degradation, foaming and wear. Entry points include open filling points, leaky seals, moist breathing air, incorrect containers or maintenance errors.
Countermeasures include: clean assembly, colour coding, breathing filters/desiccants, high-quality seals, scrapers, labyrinth seals, effective filtration (target: ISO cleanliness classes), drainage (coalescence, vacuum dehydration), centrifuges and condition monitoring (particle counters, FTIR/ Fourier transform infrared spectroscopy, ferromagnetic sensors).
For greases, flushing relubrication and controlled change intervals help. The results are longer bearing and gearbox service life, fewer downtimes and stable processes with lower total operating costs.
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