Hitachi EX1900-5, Operator'S Manual

Page: 125 / 281

OPERATING THE MACHINE
5-13
OPERATING BACKHOE
1. Place the bucket teeth on the ground with the bottom
of the bucket at a 45 degree angle to the ground.
2. Pull the bucket toward the machine using the arm as
the main digging force.
3. When soil sticks to the bucket, remove it by moving
the arm and/or bucket rapidly back and forth.
4. When lowering the boom, avoid sudden stops that
may cause shock load damage to the machine.
5. When operating the arm, avoid bottoming the cylinder
to prevent cylinder damage.
6. When digging at an angle, avoid striking the tracks
with the bucket teeth.
7. When digging a deep excavation, avoid striking the
boom or bucket cylinder hoses against the ground.
8. When trenching a straight line, position the tracks
parallel to the trench. After digging to the desired
depth, move the machine as required to continue the
trench.
NOTE: When crowding the arm, it is normal for the arm
to pause briefly at the lowest point of its curve,
as shown. This is due to the fact that the force
of gravity pulls the arm down quickly, and it
takes a moment for the hydraulic force in the
cylinder to catch up. This does not indicate
machine trouble.
GRADING OPERATION
IMPORTANT: Do not pull or push dirt with the bucket
when traveling.
Position the arm slightly forward of the vertical position with
bucket rolled back, as shown.
Operate arm roll-in function while slowly raising the boom.
Once the arm moves past, the vertical position slowly lower
the boom to allow the bucket to maintain a smooth surface.
Grading operation can be more precisely done by operating
the boom, arm and bucket simultaneously.
M145-05-008
M145-05-009
M145-05-010
100 mm (4 in)
100 mm (4 in)