Yongmao STT113 - Page 8

STT113 TOWER CRANE OPERATION AND SERVICE MANUAL
2B - 4
（2）In service
a). The driver should operate the crane in the cabin;
b). Test the motion of each mechanism with no load and low speed, meanwhile,
check that whether the brake is sensitive before lifting load;
c). It is forbidden to use any operating mode which can threaten the tower
crane safety;
d). Before traveling, drive the jib to the center line of the track;
e). It is forbidden to pass load over the person when the crane is in service;
f). It requires someone to guide, when the load is out of the sight of the driver;
g). It is forbidden to sling overweight load out of the specified radius;
h). It is forbidden to sling heavy load when the load has not been hang firmly;
i). It is forbidden to canting pull the load;
j). It is forbidden to sling the load which has fixed to the ground;
k). It is forbidden to stop normal motion by emergency stop button; it only can
be used in exceptional case which may threaten the safety;
l). It is forbidden to use limiter and brake as an normal stop device;
m). It is forbidden to short-circuit, change and adjust the safety device, or
obstruct its normal operation;
n). When the max. wind speed is less than 20m/s, windward surface of the load
should be lower than 1m
2
/t. Stop working if the wind speed reaches to
20m/s;
o). Make sure that there is no obstacle enters into jib slewing area after the
tower crane traveling;
p). If the crane operation is in bad condition, stop immediately and sent
somebody to repair;
q). Make sure that there is enough distance between the tower crane and air
electric wire;