How can an operator control the speed of the excavator?

The operator can control the speed of the excavator effectively by varying pressure on the foot pedal or joystick. This method allows for precise modulation of the machine's movements. The foot pedal typically controls the travel speed, while the joystick can manage the speed and direction of the boom, arm, and bucket operations. This responsiveness is crucial for tasks that require fine motor control, such as digging or placing material accurately.

Adjustments made through the pedals and joystick enable the operator to synchronize movements with the demands of the task at hand, leading to greater efficiency and safety. For example, when digging, a slower speed may be desired to prevent spillage or damage, while a faster speed might be suitable for travel between locations.

In contrast, other methods mentioned are either limited or not applicable for effective speed control. The throttle lever primarily affects engine speed and power output but does not provide the specific control necessary for the excavator's movements in varied situations. The idea that speed cannot be controlled and is automatic overlooks the flexible operation that modern excavators facilitate. Lastly, changing gear settings, while it can influence speed, is not the primary means for real-time control during operation, making it less effective for most tasks.