In excavating equipment you have to have an extensive amount of power to lift and move materials. As excavating equipment has gotten more defined, technology has too. Hydraulics play a big role in machines by compressing oil in a cylinder making it easier to lift heavier loads. Diesel engines were developed during the present century and have become popular over the last forty years or so because of their versatility. Electric motors show very favorable torque characteristics, but heavy expensive electric cable is required and hence only permanent.
Electric motors react very rapidly to torque requirements.
They don t perform good in rough terrain. Diesel-electric motor a diesel engine drives an electric motor and thus no cables are needed. This method is expensive and only seldom used, large mobile cranes and excavators. Lifting equipment has been used over the centuries to move materials around faster and bigger equanties. Today the choice of materials handling equipment is vast and includes all forms of cranes, fork-lift trucks, cableways, hoists, pumps and conveyors.