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Operator’s Manual for Crawler Crane
c) The load spectrum coefficient of the crane should comply with the load collective class (lift
the rated load rarely, but the medium-duty load frequently). For example:
For 1/6 of the load cycles, the crane is placed under the maximum load.
For 1/6 of the load cycles, the crane is with 73% of the maximum load.
For 1/6 of the load cycles, the crane is with 47% of the maximum load.
For 3/6 of the load cycles, the crane is with 20% of the maximum load.
“Load” herein means the total weight of lifting load and load handling devices (for example,
lifting load + load hook + sling).
Under these circumstances, assuming that the maintenance work is carried out properly,
the theoretical service life can be more than 20 years. Harder operating conditions
naturally lead to a reduction in the service life.
(1) The winch must comply with the calculation formula for theoretical residual life. For
details, refer to Maintenance Manual.
(2) Some components (for example, wire rope, pulley and bearing) are not designed for
the entire service life of the crane, but they must be replaced after a certain amount
of time of using. For relevant information, please see Maintenance Manual.
2.1.4 Engine type and its manufacturer
Engine type: QSL9-305
Engine manufacturer: American Cummins
2-3
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