A spider excavator is essentially a special type of all-terrain excavator. Like traditional excavators, it consists of a boom, stick, bucket and cab on a rotating platform known as the “house”. However, the house sits atop a different type of undercarriage. The undercarriage consists of leg or arm-like extensions with or without wheels. All can move in increments hence the name Walking Excavator. This is different from an early 20th century dragline excavator where a set of feet plate are alternately lifted and lowered. Continue reading for two more videos and information.
The spider excavator’s main feature is the ability to move in a crab- or spider-like fashion and hence overcome any terrain obstacle. The undercarriage design varies widely from model to model and between specialized roles. The number of legs or wheels can also vary from e.g. three (Menzi Muck 5000T2) to four. The “leg” design can also vary from fixed to telescoping arms. Most modern walking excavators have rotating or powered wheels allowing them to roll or drive depending on the need.