Komatsu WB93R-5, Operation & Maintenance Manual

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USING THE MACHINE AS AN EXCAVATOR
152
3.13.4 DIGGING METHOD
WARNING
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The geometry of the rotation fulcrum of boom, arm and bucket make it possible to dig even beyond the
stabilizer line, which makes the ground give way. Do not dig beyond the boom fulcrum line, since the
ground may collapse and cause the machine to overturn.
1 - At the beginning of work, keep the bucket at the correct penetration angle.
2 - Once the desired digging depth has been reached, position the bucket with its back parallel to bottom of the
excavation and then start filling.
3 - During the collection phase, make bucket, boom and arm move simultaneously; combined movements facili-
tate the filling of the bucket and therefore increase productivity.
4 - The removal depth must be correct and suitable to the type of ground; excessive depth may lock the move-
ments, overload the engine and the pump and slow down the digging operations.
5 - To dump on heaps, dump the bucket as soon as it gets near the dumping area; the inertia resulting from the
movement will ensure the compaction of the material with no need to use the bucket for this purpose, which
avoids impacts and vibrations that facilitate the wear of pins and bushings.
RWA00530
3
2
1
CORRECT DIGGING METHOD
(Sequence 1 - 2 - 3)
RWA00500
CORRECT
The bucket works with its flat surface parallel
to the ground.
RWA00510
INCORRECT
The bucket is thrusted downwards slowing
down the digging work.
RWA00520
INCORRECT
The bucket is pushed upwards and therefore
is not filled completely.
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