MACHINE OPERATIONS AND CONTROLS
125
3.3.12 WORK POSSIBLE USING COMPACT HYDRAULIC EXCAVATOR
In addition to the following, it is possible to further increase the range of applications by using various attachments.
BACKHOE WORK
This is suitable for excavating places lower than the machine.
When work equipment is in condition shown in diagram on
right, each cylinders maximum pushing exacavtion force is ob-
tained when the center line of arm cylinder and arm foot pin
and the bucket cylinder and link are at 90°, the push-out dig-
ging force of each cylinder is the maximum.
Make the optimum use of this angle during digging operations
to increase the operating efficiency.
The range for excavating with the arm is from a 45° angle
away from the machine to a 30° angle toward the machine.
There may be some differences depending on the digging
depth, not try to keep within the above range rather than oper-
ating to the end of the cylinder stroke.
DITCHING WORK
Ditching work can be performed efficiently by attaching a
bucket which matches the digging operation and then setting
the tracks parallel to the line of the ditch to be excavated.
To excavate a wide ditch, first dig both sides and then finally
remove the center portion.
LOADING WORK
In places where the swing angle is small, work efficiency can
be enhanced by locating the dump truck in a place easily visi-
ble to the operator.
Loading dump trucks is easier and the loading capacity is
greater if the hydraulic excavator loads from the rear of the
dump truck rather than from the side.
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