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Medium Pressure Filter Pi 340
Nominal pressure 250/315/350 bar (3560/4480/4980 psi), nominal size up to 450

(also available with filter elements acc. to DIN 24550)
1. Features
High performance filters for modern hydraulic system
  • Designed for control block mounting
  • Modular system
  • Compact design
  • Minimal pressure drop through optimal flow design
  • Visual/electrical/electronic maintenance indicator
  • Equipped with highly efficient glass fibre PS 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

    x=particle size [µm]

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

    tested according to ISO 16889 (multipass test)

    PS elements with

    PS vst elements with

    max. Δp 20 bar

    max. Δp 210 bar

    PS    3     5(c)    ≥200 PS vst    3       5(c)   ≥200
    PS    6     7(c)    ≥200 PS vst    6       7(c)   ≥200
    PS    10   10(c)   ≥200 PS vst    10     10(c)  ≥200
    PS    25   20(c)   ≥200 PS vst    25     20(c)  ≥200
    Values guaranteed up to
    10 bar differential pressure
    Values guaranteed up to
    20 bar differential pressure
    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: flange filter
    Nominal pressure: 250 bar (3560 psi)
    Pi 3405-3411 350 bar (4980 psi)
    Pi 3415-3445 without bypass 315 bar (4480 psi)
    Test pressure: 325 bar (4620 psi)
    Pi 3405-3411 450 bar (6400 psi)
    Pi 3415-3445 without bypass 410 bar (5830 psi)
    Temperature range: -10 C to +120 C
    (other temperature ranges on request)
    Bypass setting: Δp 7 bar 10 %
    Filter head material: GGG
    Filter housing material: St
    Sealing material: NBR/PTFE
    Maintenance indicator setting: Δp 5 bar 10 %
    Electrical data of maintenance indicator:
    Maximum voltage: 250 V AC/200 V DC
    Maximum 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 the 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 data sheet.

    We draw attention to the fact that all values indicated are average values and 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 you 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.

    9. Dimensions
    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. Preferably the filter should be installed with the filter housing pointing downwards. The maintenance indicator must be visible.
    10.2 Connecting the electrical maintenance indicator
    The electrical connection 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 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 (PS) cannot be cleaned.
    10.4. Element replacement
    1. Stop system and relieve filter from pressure.
    2. Filter sizes 300 and 450: empty the filter housing by removing the drain plug.
    3. Unscrew the filter housing by turning counter-clockwise. Clean the housing using a suitable cleaning solvent.
    4. Remove element by pulling down carefully.
    5. Check o-ring, spigot and o-ring in the element locator for damage. Replace, if necessary.
    6. Make sure that the order number on the spare element corresponds to the order number of the filter name-plate. To ensure no contamination occurs during the exchange of the element first open the plastic bag and push the element over the spigot in the filter head. Now remove plastic bag.
    7. Lightly lubricate the thread of the filter housing and screw onto the filter head completely. After that unscrew the filter housing 1/8 to 1/2 return.
    8. Check seals of vent drain plug - if necessary, please replace. Anzugsmoment Torque drain plug 30 Nm.
    11. Spare parts list