Maintenance
Maintenance Manual for Crawler Crane
The original lubrication can only lasts for a certain period of time. You need to lubricate it
regularly.
Lubricating oil should be applied by many means, such as:
a) Use the paintbrush or glove to paint the oil.
b) Put the lubricating oil on the pulley area.
c) Make the lubricating oil through the groove.
d) Adopt packing lubrication with pressure.
Figure 4-39 Lubrication of wire ropes
It’s very important to lubricate the wire ropes regularly. It’s no good to lubricate the wire rope
when it has already been damaged.
There is a danger of scratch.
4.13.3 Take-down criteria
Wire ropes are always damaged as a result of the combination of individual factors. The
executive staff should judge the cause and decide whether the wire rope should be discarded
or be used continuously.
For the damage of a wire rope, inspection personnel should firstly investigate whether it is
caused by the defect of equipment, and if so, such defect should be eliminated before the wire
rope is replaced.
The safe use of wire rope is assessed in accordance with the following criteria. Refer to
relevant Chinese National Standards (GB/T 5972) and ISO standards (ISO 4309).
Fractured wire: In case more than 10% of the single wires (excluding filling wires) of a wire
rope within one lay length fracture, for the wire rope with multilayer strands (typical multiple
strand structure), fractured wires mainly exist inside. In case the lubrication at any local position
becomes dry or deteriorated, special attention should be paid.
Fractured line: In case fractured wires exist at or near the end of the rope, even in a small
number, it indicates that the stress at such position is great. If the length of the rope permits, the
position of fractured wires should be cut out and re-installation should be performed properly.
By brush By cotton yarn By cotton yarn
4-66
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