1. Inspect the performance and condition of the crane brake. The brake is a critical component of crane machinery, directly affecting the accuracy and reliability of all mechanical movements. Therefore, it is essential to thoroughly check the condition of the lifting and telescoping mechanism brakes, observing the opening of the brake shoes and the wear on the friction elements' brake pads. For belt brakes, pay attention to checking for cracks in the steel backings of the braking bands, the smoothness of the brake's transmission, the integrity of the brake frame, and whether the main and auxiliary springs' elasticity meets the requirements.

2. The main check for the crane reducer is to see if it leaks oil. If there is an unusual noise inside the housing during operation, the cover should be opened for inspection.

1. Inspect the performance and condition of the crane brake mechanism. The brake is a crucial component of lifting machinery, directly affecting the accuracy and reliability of the movement of various mechanisms. Therefore, it is essential to thoroughly check the condition of the braking systems for both the lifting and telescopic mechanisms, observing the opening of the brake pads and the wear on the frictional elements' brake linings. For belt brakes, pay attention to inspecting for cracks in the steel back of the braking belt, the smoothness of the brake mechanism's transmission, the integrity of the brake frame, and whether the main and auxiliary springs' elasticity meets the requirements.

2. When inspecting a crane reducer, the primary focus should be on oil leakage. If there is an unusual noise inside the housing during operation, the cover should be opened for inspection. Typically, this issue arises due to damaged bearings, excessive side clearance in gear meshing, or severe wear on the gear surfaces.

3. Inspection of crane wire ropes. Pay close attention to observing situations such as broken wires, wear, twists, and rust. For locations with severe wear or broken wires that have not exceeded the standard, make a mark for focused follow-up inspection. Ensure that the safety limit switch for the wire rope on the drum is effective, and check if the wire rope clamps on the drum are securely fastened and if the number of clamps is appropriate.

4. Inspect all coupling joints of the crane for looseness, including potential "keyway" issues. Pay particular attention to the abnormal wear on the elastic rubber rings of the elastic pillar coupling joints, and be especially vigilant about the gear-tooth wear condition of the gear-tooth couplings. Due to poor installation accuracy, a significant offset between the two shafts can lead to rapid wear of the entire gear-tooth ring in a short period. If such a situation occurs in the lifting mechanism, it can easily result in severe accidents.

5. Inspection of crane sheaves, with a focus on whether the wear on the groove bottom exceeds the standard and if there are cracks in the cast iron sheaves. The balancing wheel of the hoisting mechanism sheave assembly is often overlooked as it does not operate under normal circumstances. Therefore, it is crucial to check its rotational flexibility before installation. Otherwise, the lengths and tensions of the hoisting ropes on both sides cannot be automatically adjusted through the balancing wheel during installation, thereby increasing the difficulty and danger of adjusting the hoisting ropes at high altitudes.