Hardware rigging such as lifting hooks and rings are important accessories in lifting operations, and some problems will also occur in daily use, in order to ensure the smooth and safe progress of engineering operations, and problems occur in the process of ensuring the descent. Let me introduce to you the precautions during the lowering process of the hook.
First of all, during the take-off and landing process, as long as the crane is started, the hook will be forced down. At this time, if you listen carefully in the steering valve or in the cab, you will hear a belching sound, which is the sound of hydraulic oil flowing and being compressed. This sound will naturally disappear as long as the engine stops working. So, don't panic.
In addition, when the engine is stalled, it will stop descending immediately, which shows that there is no problem with the winding brake system. If you want to check the winch, you should compare the analysis diagram of the hydraulic system and use the control handle to introduce the oil into the control valve before you can turn on the winch starter. If there is a failure during the descent process, because the hooks do not need electrical control during the descent, the circuit, electrical and other faults can be eliminated first. Generally, the source of the problem is pointed to the hydraulic system, so before and after the operation, the hydraulic system of the crane and other equipment must be checked in detail.
