Final answer:
Hydraulic excavators can have either steel tracks for rugged terrain or rubber tracks for sensitive surfaces, with choice depending on job requirements and terrain conditions.
Step-by-step explanation:
Hydraulic excavators can be equipped with either steel tracks or rubber tracks, depending on the specific needs and the environment in which they are used. Steel tracks are typically used for their durability and superior performance on rugged terrain. Conversely, rubber tracks are chosen for minimal ground damage and better traction on delicate or paved surfaces. This is similar to how some heavy machinery systems, such as power brakes and those in bulldozers, incorporate motorized pumps to assist in their hydraulic systems, allowing for efficient operation under various loads and conditions.