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    Comparison Lehnhoff vs Symmetric standard

    The Lehnhoff standard (based on an original design by Lehnhoff Hartstahl) is a quick coupler type mainly used in the German market. At Bauma 2016 Lehnhoff however also launched Symmertical type couplers which is the fastest growing international standard.

    Lehnhoff standard - advantages and disadvantages

    Advantages

    • Large installed base in Germany (which can be an advantage if you work in that maket)
    • Relatively compact desigt and in principle on the same level with Symmertical couplers.

     

    Disadvantages

    • No safe design that works on all types of excavators
    • More expensive
    • Not turnable 180 degrees (except “Symlock” but that has as disadvantage machined shafts and a weak design)
    • More complicated manufacturing process as that back end is a “angled plate”. Very small deviations in the angle will result in increased wear and tear.
    Picture quickcoupler S70 with Symmetricla standard

    Symmetrical standard - advantages and disadvantages

    Advantages

    • Growing international standard that is increasing its market share in many countries. It is also the only standard that is not “owned” by an excavator manufacturer or a quick coupler manufacturer.
    • Safe solution with Steelwrist Front PinLock technology, that does not require sensor technology in order to protect the the operator and ground personnel against dropped buckets.
    • Low fuel consumption, low weight and low building height.
    • Maintained break out force thanks to low building height. Useful to know is that the symmetrical sandwich solution (quick coupler + sandwich tiltrotator) has a lower building hight in total that a directmounted tiltrotator with Verachtert.
    • The tiltrotatorn is optimized to be able to use the gripper cassette on the tiltrotator as option.
    • Often cheaper to buy than Lehnhoff type couplers
    • Easy to convert buckets to a Symmetrical bucket by welding on a simple attachment bracket on the old bucket.

    Disadvantages

    • Smaller installed base in Germany.

    Comparison CW against Symmetric standard

    CW-standard (based on an original design by Verachtert) is a Quick Coupler type mainly used in the Netherlands and Belgium. Lately Symetrical couplers have started to gain market share also on these markets. Symmetrical Quick Couplers are sometime called S-type couplers.

    CW standard - advantages and disadvantages

    Advantages
    • Large installed base mainly in the Netherlands and Belgium
    • Safe solution as the bucket can not be dropped once the front pin is in a safe postition

     

    Disadvantages

    • Low fuel efficiency as the CW coupler is significantly heavier than a Symmetrical coupler. (Example for a 16 ton wheeled excavator where the CW coupler is 87% heavier than the comparable Symmetrical coupler)
    • Lower break out force thanks to higher building height on the CE coupler. This is only in part compensated by the difference of shape in the roof of the bucket.
    • Not suitable for a sandwich tiltrotator
    • No firm standard for angles between different bucket manufacturers.
    Picture quickcoupler S70 with Symmetricla standard

    Symmetrical standard - advantages and disadvantages

     Advantages
    • Growing international standard that is increasing its market share in many countries. It is also the only standard that is not “owned” by an excavator manufacturer or a quick coupler manufacturer.
    • Safe solution with Steelwrist Front PinLock technology, that does not require sensor technology in order to protect the the operator and ground personnel against dropped buckets.
    • Low fuel consumption, low weight and low building height.
    • Maintained break out force thanks to low building height. Useful to know is that the symmetrical sandwich solution (quick coupler + sandwich tiltrotator) has a lower building hight in total that a directmounted tiltrotator with Verachtert.
    • The tiltrotatorn is optimized to be able to use the gripper cassette on the tiltrotator as option.
    • Often cheaper to buy than CW standard
    • Easy to convert buckets to a Symmetrical bucket but welding on a simple attachment bracket on the old bucket.
    Disadvantages
    • Smaller installed based on tiltrotators especially in the Netherlands and Belgium.