Quick Couplers Pinch Power

September 28, 2010

Quick-attach couplers are important time-saving tools for many excavator jobs, but before you spec one for the end of the stick on your next hoe, consider the performance you might be giving up. Couplers add weight to the end of the stick and extend reach, which has the effect of reducing the available digging and lifting power (see table).

Performance Trade-Off*
Digging Force (tons) Breakout Force (tons)
* Based on Liebherr's 53,264-pound R914B, with 152 horsepower and a 9 foot-11 inch stick. Without Liebherr's quick-change adapter, the excavator's lift capacity increases 540 pounds, too.
Without quick-change adapter 11.6 18.5
With quick-change adapter 11.0 16.0


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