A large share of failures in hydraulic systems is caused by contaminated oil. Particles wear pumps, make valves stick and destroy seals. The filter is therefore a small part with a big effect.
Cleanliness code and filter rating
Oil cleanliness is stated to ISO 4406 with three numbers, for example 18/16/13. They stand for the number of particles larger than 4, 6 and 14 micrometres per millilitre. Each step up means roughly twice as many particles.
The filter rating defines how well a filter retains particles of a certain size. The required cleanliness depends on the most sensitive components; servo and proportional valves need cleaner oil than simple switching valves. A clogged filter is detected by the clogging indicator.
What a request for filter elements should contain
- type designation of the element or filter housing
- filter rating and filter material
- dimensions and seal material
- position: suction, pressure or return filter
- quantity, ideally for several change intervals
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