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Low Pressure Filter Pi 1500
Nominal pressure 10/25 bar (140/360 psi), nominal size up to 600
Filter elements according to DIN 24550
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-N2 Elements with max. Δ p 10 bar
    Sm-N 2 Elements with max.Δ p 5 bar

    Sm-N   2     4(c)  ≥200
    Sm-x    3     5(c)  ≥200
    Sm-x    6     7(c)  ≥200
    Sm-x   10   10(c)  ≥200
    Sm-x   16   15(c)  ≥200
    Sm-x   25   20(c)  ≥200

    values guaranteed up to 10 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 manufactured respectively, tested in accordance with the following international standards:
    6. Symbols
    7. Order Numbers
    8. Technical specifications
    Nominal pressure: 10/25 bar (140/360 psi)
    Temperature range: -10 C to +120 C
    (other temperature ranges on request)
    Bypass setting: Δ p 3.5 bar 10 %
    Filter head material: GAL
    Filter housing material: St
    Sealing material: NBR
    Maintenance indicator setting: Δ p 2.2 bar 10 %
    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.

    Housings with nominal pressure 10 bar (140 psi) are fitted standard with air bleeder valve.


    Subject to technical alteration without prior notice.
    9. Dimensions
    All dimensions except "C" in mm.

    NPT- and SAE connections on request.
    * Standard pressure series hole pattern 3000 PSI
    10. Installation, operating and maintenance instructions
    10.1 Filter installation
    When installing the filter make sure that sufficient space is available to remove filter element and filter housing.
    10.2 Connecting the electrical maintenance indicator
    The electrical indicator is connected via a 2-pole appliance plug according to DlN EN 175301803 with poles marked 1 and 2. The electrical indicator is connected via a 2-pole appliance plug according to DIN EN 175301-803 with poles marked 1 and 2. The electric upper section can be inverted to change from normally open position to normally closed position or vice versa.
    10.3 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 ensure that you have original MAHLE spare elements in stock: Disposable elements (Sm-x, Sm-N) cannot be cleaned
    10.4 Element replacement
    1 . Stop system and relieve filter from pressure.
    2 . Loosen quick-action clamp (10 bar version) or screws of flanged cover, remove cover, and open drain valve. Housing completely vented.
    3 . Remove filter element from the filter housing.Remove spacer sleeve at Pi 15060. After proper cleaning please use again.
    4 . Check seal for damages, replace if necessary.
    5 . Make sure that the part number on the spare element corresponds with the part number on the filter label. It is necessary to replace always both elements of Pi 15060. Remove the plastic bag and push element over the spigot in the filter head. Attach sleeve on Pi 15060 and fit second element.
    6 . 10 bar version: Close drain valve, relocate cover, and close the quick-action clamp. Filters are automatically vented via the air bleeder valve, the protection cap has to be turned 2 times for being open.
    7 . 25 bar version: Close drain valve and put the cover plate on so that the stud bolts go into the holes of the cover plate. Make sure not to squeeze the O-ring on the bottom side of the cover plate. Hand-tighten the 8 mounting nuts with spring rings. Then draw up the nuts tight crosswise with a turn-screw SW 19 without canting the cover plate. Tightening torque for mountings nuts is 50 Nm. After bringing the hydraulic unit to service de-aerate the filter via vent-screw.
    11. Spare parts list