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Low Pressure Filter Pi 1975
Nominal pressure 6 bar (90 psi), nominal size 50
1. Features
High performance filters for modern hydraulic system
  • Provided for pipe installation
  • Modular system
  • Compact design
  • Minimal pressure drop through optimal flow design
  • Visual/electrical/electronic maintenance indicator
  • Threaded connections
  • Quality filters, easy to service
  • Equipped with highly efficient glass fibre Sm-x filter elements
  • Beta rated elements according to ISO 16889 multipass test
  • Elements with high differential pressure stability and dirt holding capacity
  • Worldwide distribution
  • 2. Flow rate/pressure drop curve complete filter

    y=differential pressure Δp [bar]
    x = flow rate V [l/min]

    3. Separation grade characteristics 4. Filter performance data

    y=beta-value
    x=particle size [µm]

    determined by multipass tests (ISO 16889)
    calibration according to ISO 11171 (NIST)

    tested according to ISO 16889 (multipass test)

    Sm-x-/Sm-N 2 elements with
    max. Δp 5 bar

    Sm-N   2     4(c)    ≥200
    Sm-x    3     5(c)    ≥200
    Sm-x   10    10(c)    ≥200

    Values guaranteed up to 5 bar differential pressure, Sm-N 2 elements up to 5 bar differential pressure.

    The filter element Sm-N 2 is an element with a very large dirt holding capacity, especially for bypass filtration.

    5. Quality assurance
    MAHLE filters and filter elements are produced according to the following international standards:
    6. Symbols
    7. Order numbers
    8. Technical specifications
    Design: in-line filter
    Nominal pressure: 6 bar (90 psi)
    Test pressure: 8 bar (110 psi)
    Temperature range: - 10 C to + 120 C
    (other temperature ranges on request)
    Filter head material: St
    Sealing material: NBR/Cu
    Maintenance indicator setting: Δp 1.2 bar 0.2 bar
    Electrical data of maintenance indicator:
    Max. voltage: 250 V AC/200 V DC
    Max. current: 1 A
    Contact load: 70 W
    Type of protection: IP 65 in inserted and secured status
    Contact: normally open/closed
    Cable sleave: M20x1.5

    The switching function can be changed by turning the electric upper part by 180 (normally closed contact or normally open contact). The state on delivery is a normally closed contact. By inductivity in the direct current circuit the use of suitable protection circuit should be considered. Further maintenance indicator details and designs are available in the maintenance indicator data sheet.

    We draw attention to the fact that all values indicated are average values which do not always occur in specific cases of application. Our products are continually being further developed. Values, dimensions and weights can change as a result of this. Our specialized department will be pleased to offer you advice.

    We recommend to contact us concerning applications of our filters in areas governed by the EU Directive 94/9 EC (ATEX 95). The standard version can be used for liquids based on mineral oil (corresponding to the fluids in Group 2 of Directive 97/23 EC Article 9). If you consider to use other fluids please contact us for additional support.

    Subject to technical alteration without prior notice.


    Design without indicator- weight 8 kg
    *1 vent screw G¼
    *2 SW 36 for maintenance
    *3 heigh required for element removal 400
    *4 drain plug G¼ 90 ill. turned by 90
    In = inlet
    Out = outlet
    9. Installation, operating and maintenance instructions
    9.1 Filter installation
    When installing filter make sure that sufficient space is available to remove filter element and filter housing. Preferably the filter should be installed with the filter housing pointing downwards. The maintenance indicator must be visible.
    9.2 Connecting the electrical maintenance indicator
    The electrical indicator is connected via a 2-pole appliance plug according to DlN EN 175301-803 with poles marked 1 and 2. The electrical section can be inverted to change from normally open to normally closed position or vice versa.
    9.3 When should the filter element be replaced?
    1 . Filters equipped with visual and electrical maintenance indicator:
    During cold starts, the indicator may give a warning signal. Press the red button of the visual indicator once again only after operating temperature has been reached. If the red button immediately pops up again and/or the electrical signal has not switched off after reaching operating temperature, the filter element must be replaced after the end of the shift.
    2 . Filters without maintenance indicator:
    The filter element should be replaced after the trial run or flushing of the system. Afterwards follow instructions of the manufacturer.
    3 . Please always make sure that you have original MAHLE spare elements in stock: Disposable elements (Mic, FIL, Sm-N or Smx) cannot be cleaned.
    9.4 Element replacement
    1 . Stop system and relieve filter from pressure.
    2 . Remove cover screw, then lift off cover. On executions with indicator please unscrew maintenance indicator.
    3 . Remove filter element.
    4 . Check seals for damage. Replace if necessary.
    5 . Make sure that the order number on the spare element corresponds to the order number of the filter name-plate. Remove plastic bag and push element over the spigot in the filter housing.
    6 . Close drain screw, relocate cover and close it with cover screws and/or the indicator. Filters are automatically vented via the air bleeder valve. (Back off the screw 1-2 turns till medium escapes. Tight vent screw).
    10. Spare Parts List