What is the correct method for checking the brakes on an already assembled crane?

Lifting the load a few inches off the ground and then applying the brakes is the most effective method for checking the brakes on an assembled crane because it simulates a real working condition where the brakes are required to hold a load. This method ensures that the brakes are not only functional but also capable of handling the weight they will encounter during actual operation.

When a load is lifted slightly, it provides a clear assessment of the braking system under stress, allowing the operator to evaluate how well the brakes engage and whether they are capable of holding the weight securely. If the brakes can successfully hold the load in place when applied, it indicates that they are functioning properly.

In contrast, testing the brakes while stationary may not give an accurate representation of brake performance under load conditions. Checking without any load could result in a false sense of security, as the brake system may perform differently when fully engaged with a weight. Additionally, checking the brake fluid level, while important for the overall health of the hydraulic system, does not directly assess the actual braking performance. Therefore, lifting the load a few inches before applying the brakes is considered the most reliable method for ensuring the brakes are in good working order.