Which components are included in the pump unit of a hydraulic elevator?

The pump unit of a hydraulic elevator primarily consists of components that facilitate the movement and control of hydraulic fluid, which is essential for the lifting mechanism. The correct answer highlights the fundamental parts crucial to the function of the hydraulic system.

In a hydraulic elevator, the oil tank stores hydraulic fluid, which is pumped to create the lifting force. Valves play a critical role in controlling the flow of the hydraulic fluid, directing it to and from the cylinder that elevates the cab. These components work together to ensure that the elevator operates smoothly and safely, allowing it to rise and descend as needed.

This understanding reflects the functionality of the pump unit itself, distinct from other related components. While the motor and reservoir mentioned in another option are indeed associated with the system, they are not part of the pump unit specifically. The interlock, associated with safety mechanisms, ensures safe operation but does not contribute to the hydraulic lifting process as directly as the oil tank and valves do.

In summary, the correct answer encompasses the core components necessary for the hydraulic system's operation, highlighting the essential nature of the oil tank and valves in the pump unit of a hydraulic elevator.