The upper mechanism of wheel excavator can rotate 360 ° freely. It is usually stipulated that the normal driving state is when the cab and chassis turn to the front axle in the same direction, and the digging state is when the upper mechanism turns to the rear of the chassis, that is, the cab and the rear drive axle of the chassis turn to the same direction.
1. Steering in driving state
When the cab and steering front axle are in the same direction, the front wheel rotation direction is consistent with the steering wheel rotation direction, the driving steering operation is intuitive, the forward and backward driving steering is consistent with the ordinary vehicle, and the operator has no difficulty in judging and operating the direction.
2. Steering when the cab and rear drive axle are in the same direction
When the upper mechanism rotates to the rear, that is, the cab and the rear drive axle are in the same direction, the steering direction of the whole machine will be opposite to that of the steering wheel if the front and rear steering operation is to be carried out. In this case, the driver's operation response and steering judgment are required to be higher, which increases the difficulty of the driver's operation, especially in some special areas, such as narrow passages, it is very easy to misoperate and lead to accidents.