What are these safe operation tips for industrial crane?

Take L type Orange Peel Grab for example.
1. The driving zone and work site should be even and solid, and keep a safe distance from the ditch or foundation pit
2. Check out the inspection items as followed before you start the cranes:
(1) Safety protection devices and indicating instruments are in good condition;
(2) Steel wire ropes and joint parts meet the standard code.
(3) Add enough fuel, lubricating oil, hydraulic oil and cooling water.
(4) Adapting pieces connect tightly.
(5) Tire pressure conforms to the regulations.