STT113 TOWER CRANE OPERATION AND SERVICE MANUAL
3B
-
7
IV. Precautions during operation
The working environmental temperature of tower crane is:
----20
20
20
20
℃
℃
℃
℃
～
～
～
～++++40
40
40
40
℃
℃
℃
℃
, the
max. working wind speed is 20m/s and working grade is A
4444
.
1. Each time before operation
a).
Make sure that the power supply, cable and switches are in perfect condition.
b).
Make sure that each pin, bolt and split pin are in normal condition, restrict the
jib slewing freely (release the weather vane effect).
c).
Make sure that the counter-jib ballast and base ballast are fixed firmly.
d).
Check the hoisting and trolleying wire rope.
e).
Check the lubricating of hoisting reducer and slewing ring.
f).
Switch on the power supply.
g).
Test all mechanisms with no load and check each mechanism, brake and
limiter, if necessary, readjusted it.
h).
If the working height of tower crane is beyond
50
m, an anemoscope must be
installed. If the wind speed exceeds
20
m/s, it can sent audible and visual alarm,
then, the tower crane must stop working.
2. During operation
a).
Never lift load beyond the permitted radius.
b).
Never pull load in an oblique direction.
c).
When entering into the cabin, check that whether the extinguisher, instruction
plate and warning plate are in place.
d).
Check that whether the hailer is in perfect condition.
e).
Never lift load or other components which fixed on the ground.
Pay special attention: if hear some abnormal noise, stop operating the
tower crane immediately, and inform it to the site supervisor; if the wind speed
reaches to 20m/s
，
，
，
，
and sent audible and visual alarm, it must stop working; if the
load is out of the sight of the driver, there must be someone as a guide; never
cancel any safety device or adjust at random without authorization.
