Which stipulated procedures should be performed when the crane boom is retracted

Which prescribed procedures should be performed when the crane boom is retracted:

1. The site where cranes are to be driven and work should remain flat and secure, and should maintain a safe distance from ditches and pits.

2. The key inspection items before the crane starts shall meet the following requirements.

3, all safety protection devices and indicator instruments are all intact.

4, wire ropes and connection parts in line with regulations.

5, fuel, lubricating oil, hydraulic oil and cooling water add enough.

6. There is no loosening of the connectors.

7, tire pressure in line with the provisions.

8. After the crane starts, it should run at idle speed, check the indicator value of each meter, and engage the hydraulic pump after normal operation. When the pressure reaches the specified value, the oil temperature can exceed 30°C before starting operation.

9, before the work, should all out of the legs, and under the foot board pad square wood, adjust the body so that the slanting of the bearing surface when no load is not greater than 1/1000 (standard bubble center). Legs with positioning pins must be plugged in. The chassis is an elastic suspension crane. The stabilizer should be tightened before placing the legs.

10. It is forbidden to move the operating valve of the leg during operation, and the adjustment leg must be carried out when there is no load, and the adjustment of the lifting arm can be performed before or after the front.

11. The length and elevation angle of the boom should be adjusted according to the weight of the hoisting weight and the lifting speed, and the height of the sling and the weight itself should be estimated to leave an appropriate space.

12. When the boom is telescopic, it should be carried out in accordance with the prescribed procedures. At the same time, the boom should be lowered accordingly. When the limiter alarm occurs, arm extension should be stopped immediately. When the lifting arm is retracted, the elevation angle should not be too small.

13. After the boom is extended, if the length of the front boom is greater than the length of the rear section, adjustments must be made to eliminate abnormal conditions before operation.

14. When the boom is extended or after all the main and sub-arms are extended, the amplitude must not be less than the specified elevation angle of each length.