Invisible threat: Particle contamination
Oil that appears clean to the naked eye can contain microscopic abrasive particles that jam proportional spools or score pump surfaces.
ISO 4406 Cleanliness Classes
Quantifies particles at 4µm, 6µm, and 14µm scales. Systems with proportional or servo valves demand strict targets like ISO 16/14/11.
Filter selection & maintenance
Suction, pressure, return, and off-line kidney loop filters must be selected with precise micron ratings and monitored with differential indicators.
Flushing procedures
Following new piping installation or major component overhauls, high-velocity flushing is essential to clear internal scale and debris.