Tower crane in qualified general technology test:
A. lifting mechanism, operation lifting switch, slow start lifting - Fast - slow - hoisting braking, slow decline - falling fast - slow decline - brake, so repeated several times, to observe the whole process is sensitive, accurate.
B. Luffing mechanism
Starting switch: the variable amplitude trolley forward - stop - down the line, so repeated several times, to observe whether accurate and reliable.
C, slewing mechanism
Start switch, positive and negative 360 degrees, low - high - low - to stop, so repeated several times, at about four level when the wind, the parking brake, observe whether sensitive, reliable.
D, integrated action test
Lifting, luffing, rotary three actions at the same time, repeated several times.

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