Which part of the dumper should you check for hydraulic leaks?

The hydraulic lines and cylinder connections are critical components of a dumper's operation, and checking them for hydraulic leaks is essential for several reasons. Hydraulic systems rely on fluid pressure to function properly, and any leaks can significantly impact performance, leading to potential equipment failure or safety hazards.

By inspecting the hydraulic lines, you can identify any wear and tear, cracks, or loose fittings where fluid may leak. Similarly, cylinder connections need to be checked as these are points where pressure is maintained in the system. If there are leaks at these connections, it can cause the dumper to operate inefficiently or even lead to complete hydraulic loss, which could halt operations.

In contrast, inspecting the engine and fuel tank is more related to power and fuel supply rather than hydraulic function. Checking tires and wheel assembly focuses on mobility and safety rather than the hydraulic system's effectiveness. Finally, looking for air leaks in the driver's cabin pertains to operator comfort and safety rather than the hydraulic system’s integrity. Therefore, focusing on the hydraulic lines and cylinder connections directly addresses the risk of hydraulic failure, making it the correct answer.