Kato SR-300L, Instruction Manual

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16-3 Precautions on setting the outriggers
(511A-0051-1E)
The outrigger control switches are located on the side of the carrier body and inside the cab. As a general rule, the
control switches on the carrier body should be used, but if you unavoidably have to operate the outriggers from the cab,
ask another worker to insert the stopper pins and place the boards under the outrigger feet.
When the outriggers are used, the load values in the rated lifting capacity chart are based on the assumption that the
crane is supported on the level by the outriggers. Therefore the strength of the ground where the outriggers are set is
one of the most important factors for safety.
In some working positions, as much as 80% of the total mass of the crane plus the suspended load may act through a
single outrigger, creating an enormous surface pressure under the outrigger float. If this happens, ground conditions
below the surface can cause the float to sink into the ground, even in ground which appears to be level and firm at first
sight.
Therefore always watch for the following points.