When a device is installed, if you have not carefully read its instructions for use. 

Or if you have an understanding of such mechanical equipment. 

It's impossible for you to know some issues that need your attention during installation. 

Just like installing a pneumatic hoist, there are some precautions that need to be taken into account. 

Usually, safety information is provided in the operating manual, and specific guidance and methods for all operating procedures must be followed throughout the entire maintenance process. 

Pneumatic hoists cannot be used to lift people, and personnel are not allowed to stay under the machinery during operation.