Filter Selection

Guideline
Tips and information on how to select the optimal hydraulic filter

Preface
When determining the required cleanliness in a hydraulic system,
additionally to the technical requirements of the hydraulic
components and to the operating pressure, the user‘s expectations to availibility, safety and service life of a machine become
increasingly important. These aspects were particularly taken
into account in the present ARGO-HYTOS guideline.
Detailed attention is also given to two filter concepts which are
becoming increasingly important: return-suction filters and
off-line filters.
More than ever before, the ARGO-HYTOS Guidelines offer useful
advice on selecting technically and economically ideal filter
concepts for hydraulic systems, and experts will also find that
they contain important information.
Did you know that …

› fresh oil can often contain 10 times more dirt particles than are
acceptable for hydraulic systems of high technical quality?

› if the operating pressure is increased by only 50 %, the
ARGO-HYTOS Return-Suction Filter E 198

number of dirt particles in the oil must be reduced by a factor
of 3 to avoid a deterioration in the lifetime of the components?

› even a filtration quotient of β = 200 corresponds to filtration
efficiency of 99,5 % for all dirt particles that are larger than
the specified size, and a β-value of only 10 still corresponds to
90 % efficiency?

› even oil sample bottles declared as clean can contain considerably more dirt particles than the examined oil, if it comes from
hydraulic systems with good filtration?

› a lifetime of 1.000 service hours for a hydraulic filter corresponds to a mileage of about 60.000 km of a passenger car?

› only an online count can determine the actual values for
cleanliness classes < 10 (ISO 4406)?

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