The hydraulic systems maintenance strategies are basically divided into two macro-categories:
  • Proactive maintenance
  • Predictive maintenance

that, although operating in a different and distinct way between them, have points of connection but above all have the same purpose: the reduction of faults and the improvement of the performances. In this framework, the analysis of hydraulic fluids is useful not only to establish the "health condition" of the fluid, but also to understand the conditions under which a particular system is working.

Assessing the trend over time of analytical data (particle material, metal residues, viscosity, etc.) may be useful for carrying out maintenance works no longer according to fixed deadlines, but according to the actual conditions of the system.