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Maintenance Manual for Crawler Crane
4.11 Maintenance of the electrical system
4.11.1 Inspection of the illumination system
Check for normal operation of the illumination system. If any faults are detected, repair them at
once.
4.11.2 Inspection of hoisting limit switch
When load hook comes into contact with the limit weight during its upward movement, the
hoisting limit switch is triggered, the buzzer sounds and the crane movement “lift the load hook”
is cut off automatically. At this time, only lower the load hook to release the limitation.
Release the limit weight by operating the control lever to safe direction, the operation will be
normal again.
4.11.3 Inspection of battery master switch
When it is night or the crane doesn’t work for a long time, check that the switch is in “OFF”
position.
4.11.4 Inspection of cable joints and dust caps
During assembly, dismantling and conversion of basic machine, check if the cable joints are
connected with each other tightly and the dust caps are well covered.
4.11.5 Maintenance of the battery
Batteries must be well maintained and kept for use, because they function as the power supply
of starting the engine, electrical control system, illumination and electrical auxiliary devices of
the machine. Its technical performance accords with national standard GB5008-91 for Crane
Lead-acid Battery. Thus it’s important to maintain it well.
a) Store the battery (a filled and charged lead-acid battery) at the temperature ranging from
5 °C to 25 °C and in a dry, clean and ventilated environment. Do not expose the battery to
direct sunshine to avoid degradation of the performance caused by high ambient
temperature.
b) Do not invert and place the battery horizontally. Do not shock and press the battery
mechanically.
c) Recharge the battery in time to avoid performance degradation caused by the sulfating of
the battery.
d) Do not overcharge the battery. Avoid premature failure of the battery caused by too much
water loss, growth of grid and drop of diachylon.
e) Remove the batteries from the crane and store them in a well-ventilated and dry place if
they are used for a long time (usually more than 15 days). Charge the batteries every 3-6
months (see if the indicator is black or not).
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