the load should not exceed 70% from the weight allowed

weight lifting and lowering speeds should be smooth, uniform, not sudden braking; should balance the right and left to rotate when the rotation is not completely stopped before for no reverse action; lifting at full load or near full capacity, the non-landed arm rod or two actions simultaneously.
lifting objects should pull the rope slipped, the speed should be uniform, prevention of sudden braking  and changes of direction; operation controller may not be directly transform the direction of rotation.
when the (track) Cranes For travel with load, the load should not exceed 70% from the weight allowed, walking roads should be solid flat, heavy crane is the former should be the direction of the weight off the ground no more than 500mm, and should be tied good rope, slow moving; non-load driving long distances. Cranes soft ground is not flat, lifting ban two simultaneous movements.
with two or more cranes Hand lifter lifting the same weight, the rope should be kept vertical; each crane lifting, running should be kept synchronized; each station machine heavy machinery to withstand load shall not exceed the rated lifting throughout capability. If not reach the above requirements, should be reduced to 80% of the rated lifting capacity; also be reduced according to actual situation Engineer rated lifting capacity to use. Hanging with time, chief engineer should be present guidance.
crane safety device malfunction, failure or incorrect operation when prohibited ill; in the job, is strictly Electric store Positioner prohibited on transmission parts, moving parts and moving parts house and area to do repair, maintenance, adjustment, etc.; transmission parts should be lubricated Good.
there are six or more in the open air winds or heavy rain, snow, fog and other inclement weather, they should stop lifting operations. After rain and snow before the job, you should try hanging, sensitive and reliable confirmation brake before starting work.
 when the height of the lifting operations or the driver can not clearly see that the job location or signal set signal transfer personnel. Lack of natural light in the open place of work or work at night, they should be provided with sufficient lighting