PURPOSE: To permit the optional selection of the operational modes of an excavating working car by a driver according to the skill level of a driver by using two modes, the operation of usual lever and a copying operation.
CONSTITUTION: Operation valves V1WV4 for boom, arm, bucket, and turning are connected to two cross-shaped rocking levers 14 for skilled driver, operation valves V1WV3 excluding the valve V4 for turning are connected to contractionally proportional model type operation mechanism 16 for unskilled driver, and left and right-handed running operation valves V5 and V6 are connected to two running operation levers 15. Then, all the operation valves V1WV6 are connected to a control mechanism 25 and various kinds of operation patterns are stored in the control mechanism 25. The switching of the cross-shaped lever 14 or model type operation mechanism 16 is made through selection mechanisms 28 and 29.
NONAKA TOSHISUKE
TSUDA EI
