Hitachi ZX27U-2, Operator'S Manual

Page: 99 / 230

OPERATING THE MACHINE
5-11
OPERATING BACKHOE
•
Select an arm and bucket whose specifications match
the working conditions. (Refer to “Kinds and Applica-
tions of Buckets” in the specification section.)
•
Pull the bucket toward the machine using the arm as
the main digging force.
•
When soil sticks to the bucket, remove it by moving
the arm and/or bucket rapidly back and forth a few
times.
•
While facing the bucket tooth tip toward the direction
of excavation as straight as possible, excavate the
ground with the teeth penetrating shallowly using the
arm and bucket cylinder full strokes.
•
Position the tracks parallel to the trench. After digging
to the desired depth, move the machine backward to
continue the trench.
•
Operate each cylinder with a slight allowance left at
both stroke ends.
IMPORTANT:
•
Do not dig the ground in the diagonal direction
toward the track frame. Failure to do so may
cause the bucket teeth to come in contact with
the crawler.
•
When lowering the boom, avoid sudden stops
that may create shock load damage to the ma-
chine. Always smoothly lower the boom so that
shock loads may not be created.
•
When digging deep below the ground level, be
careful not to allow boom cylinder, boom bot-
tom, and/or bucket cylinder hoses to come in
contact with the ground.
•
When digging with the blade positioned to-
wards the front or when digging at an angle,
avoid hitting the blade.
•
When the bucket load is dumped with the boom
raised, falling material may hit the base ma-
chine and/or the canopy. Always be aware of
loads in the bucket during operation.