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12. OPERATION
12.15 WORK POSSIBLE USING HYDRAULIC
EXCAVATOR
In addition to the following, it is possible to further increase the range
of applications by using various attachments.
12.15.1 BACKHOE WORK
When condition of the machine is as shown in the diagram at right,
each cylinders maximum pushing excavation force is obtained when the
bucket cylinder and link, arm cylinder and arm are at 90
When excavating, use this angle effectively to optimise your work
efficiency.
The range for excavating with the arm is from a 45
the machine to a 30
o
toward the machine.
There may be some differences depending on the excavation depth,
but try to use within the above range rather than going all the way to the
extreme end of the cylinder stroke.
12.15.2 SHOVEL WORK
A shovel is suitable for excavating at a position higher than the ma-
chine. Shovel work is performed by attaching the bucket in the reverse
direction.
12.15.3 DITCHING WORK
Ditching work can be performed efficiently by attaching a bucket to
match the width of the ditch and then setting the wheels parallel to the
line of the ditch to be excavated.
To excavate a wide ditch, first dig out both sides and then finally
remove the center portion.
12.15.4 LOADING WORK
In places where the swing angle is small, work efficiency can be en-
hanced by locating the dump truck in a place easily visible to the opera-
tor.
Loading is easier and capacity greater if you begin from the front of
the dump truck body than if loading is done from the side.
2-76
o
.
o
angle away from
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