STT113 TOWER CRANE OPERATION AND SERVICE MANUAL
2B
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6
（2）Maintenance of the electrical equipment only can be carried out by qualified
electrician or trainee which is supervised by a qualified electrician according to
the electrical rules.
a).. The tower crane must be cut off the electricity during maintenance and repair,
meanwhile, set up a warning plate of “manned operation, prohibit switch on”
on the obvious position of power supply panel, then earth or short circuit the
power line (after this, do please dismantle the earthing and short circuit line);
b). The electrical equipment of tower crane should be checked periodically. If
discover some hidden danger, such as connection loosen, electrical wire
earthing, component breakage, etc, it must be eliminated in time;
c). If it must carry out live-wire work, there should be someone to monitor, so that
the main power supply can be cut off in emergency situation.
7. Hydraulic system
a). Only the professional or experienced person can operate the hydraulic
system；
b). Periodic check every kind of conduct pipe, flexible pipe and joint, so that
check up the oil leak and external malfunction, if so, eliminate that
immediate (oil leak may cause damage and fire);
c). Release the component pressure according to the relevant regulations before
repairing.
d). Install the hydraulic pipe line correctly. Do not connect the high and low
pressure interfaces in reverse. Meanwhile, the joint length and quality of the
flexible pipe should meet the requirement;
e). Hold the oil quantity and quality in the oil box. Check the hydraulic oil
quality periodically, if the oil has already deteriorated, it must be replaced at
once which can ensure the pump station work normally.
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