Komatsu PC18MR-3, Operation & Maintenance Manual

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USE OF THE MACHINE AND RELATED CONTROLS
156 WEAM012101
3.3.12 POSSIBLE APPLICATIONS OF THE HYDRAULIC EXCAVATOR
In addition to those indicated below, many other applications are possible, thanks to the use of various attach-
ments.
DIGGING WITH REVERSED BUCKET
The excavator is suitable for carrying out digging operations in a
lower position with respect to the machine.
When the machine is in the position shown in the diagram on the
right, the maximum digging and thrusting force of each cylinder is
achieved when the bucket cylinder and its articulated joint, the
arm cylinder and the arm are at 90° with respect to each other.
During the digging operations, keep this angle amplitude to opti-
mize the performance of the machine.
The positions available for digging with the arm range from a 45°
angle away from the machine to a 30° angle towards the ma-
chine.
There may be some differences depending on the digging depth,
but it is advisable to try to keep within the above range rather than
operate with the cylinders reaching the end of stroke.
DITCH DIGGING
Ditch digging operations may be effectively carried out by install-
ing a bucket suitable for this type of digging and positioning the
tracks parallel to the ditch digging line.
To create wide ditches, first dig on both sides and then remove
the earth at the centre.
LOADING OPERATIONS
In the positions in which the rotation angle is reduced, the operat-
ing efficiency may be increased by positioning the dumper so that
it is clearly visible for the operator.
The loading operation is easier and the loading capacity greater if
the hydraulic excavator works from the back and not from the
sides of the truck.