Safe operation of Industrial Cranes

 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.

3. Adopt idle running after starting the crane to check out the indicated value of the instruments. Then combine with hydraulic pump when the machine functions well. Start working when the pressure achieves the rated value and the oil temperature is over 30℃.

4. Stretch the landing leg fully and pad the arm-brace with square timber before working. Adjust the engine body so that the gradient of the slewing bearing surface less than 1/1000 without loads (level bubble is in the center). Plug the anchor pin if the outrigger has one. Frap the stabilizer before outstretching the landing leg if the crane chassis with elastic suspension.

5. Don’t touch the operating valve when you’re working. Place cargo boom in the front/back of the machine before adjusting the outrigger with no loads.

6. Adjust the length and elevation angle of the cargo boom according to the weight and hoisting speed of the loads. Leave suitable room considering the sling and height of the loads.

7. Stretch out and draw back the cargo boom in accordance with the established procedure. Descend the lifting hook when you stretch out the cargo boom. If the limiter alarms, you should stop outstretching the boom. It is not suitable if the elevation angle is too small.

8. If the previous section of the lifting arm is longer than the posterior section when you stretch out the cargo boom, you must adjust it and eliminate the abnormal phenomenon before working.

9. When the cargo boom outstretches, or the main and vice-jib stretch fully, the amplitude of variation must no less than the specified elevation angle of any length.


10.No one is allowed to stay in the truck cab when the automobile crane works. The load mustn’t surpass the above of the cab and don’t lift the weight in front of the truck.

11. If you employ the method of free fall (gravity lowering), the load mustn’t exceed 20% of the rated lifting weight, and assure the load descends in control. The users should decelerate the speed gradually before lowering motion stops, and don’t use the emergency application.

12. Keep the crane in low gear when the lifting load is equal to or more than 50% of the rated lifting weight.

13. If there are any abnormal phenomena such as lean-state of the crane, instability of the outrigger, you should descend the load in a safe place immediately. It is prohibited to braking during the process of descending.

14. Lock the brake of hoisting drum when you need to remain the weight in the air for a long time, and the operator must stay in the operating room.

15. It is forbidden to do more than two operational motions simultaneously when the weight reaches 90% of the rated lifting weight.

16. Operations should keep balancing to avoid sharp turns or shutoffs when you turn the lifting with load. Make sure you change directions after halting absolutely.

17. When driving the rubber-tired crane with loads, you should assure the ground is even and solid, the loads meet the regulations, weights detach the ground less than 500mm. Then fasten the stay cord and drive slowly.

18. Draw back the cargo boom on the holder, and then withdraw the landing leg when you finish the work. Lifting hook should hang tightly with the specified steel wire ropes; prop the jackstays which under the car frame into the adminicula respectively, and fasten them with nuts; plug the pin-type detent which used to prevent the body from rotating into the pin hole. Then put the operating handle of the power takeoff into the disengagement location. Lastly it should lock the door of the operating cab.

19. Check out and make sure the landing legs joint tightly and the tire pressure conforms to the regulations before driving. The water temperature should be within 80—90℃ when you drive the machine. If the temperature less than 80℃, you shouldn’t drive it at a high speed.

20. Keep an intermediate speed when you are driving, and don’t take a sharp brake. Slow down when you meet a railroad crossing or a rough road. It is prohibited that sliding with a neutral gear down the slope. Make sure someone supervises the process of backing the car. It is prohibited standing/squatting on the chassis platform, or stacking materials on it.