STT113 TOWER CRANE OPERATION AND SERVICE MANUAL
3B
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8
3. Each time after operation
a).
Lift the hook to the top end.
b).
Drive the trolley to the jib foot, start the weather vane and brake device, to
make the jib slewing freely (weather vane effect). If power off, manual operate
this device. For traveling type tower crane, anchor the crane by 4 rail clamping
devices.
NOTE: The weather vane effect, that is to say, above the upper slewing can slew
freely, it can reduce the windward area automatically. Thus the crane driver must
start the weather vane after he is off duty.
c).
Turn off the main power supply switch and take the measures against rain.
d).
Depress the emergency button, and cut off the power supply.
