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Comparison Lehnhoff vs Symmetric standard

gripper casette excavation bucket

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.

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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.