Home—Tech notes—Maintenance and faults—70% of failures start in the oil: hydraulic oil cleanliness Maintenance and faults · October 18, 2026 · 1 min read 70% of failures start in the oil: hydraulic oil cleanliness Particle counts, NAS classes and filter intervals. Most failures start with dirty oil.Particle countNAS 1638 / ISO 4406.FiltersChange by differential pressure.SamplingAt commissioning, 500 hours, then twice a year. Tags#maintenance#oil#filter Share WhatsApp LinkedIn X Facebook Copy link MK Author Murat Kaya Engineer · AKIS Hydraulics From the AKIS Hydraulics engineering team.
