FOr a large number of mobile crane landing gear plays a minor role and is operated in this case by hand. Examples of the arrangement of handling and locomotive cranes have for the suspension of execution in a multi-engine cranes one or two specific driving engines, which work by single or double transfer on the driving wheel axles. In spring axle boxes of the relative motion of the drive axles to the car frame be taken into account (see figure). To achieve the necessary stability in the off state does not ensure that proper riding landing gear brakes are to be arranged (see figure).