Loading Shovel Operation; Prohibited Operation - Hitachi EX1900-5 Operator's Manual

LOADING SHOVEL OPERATION

1. To dig, position the bucket bottom parallel to and
touching the ground and extend the arm while crowd-
ing the bucket.
2. Digging force increases as the arm is extended. Try to
dig with the arm extended where strong digging
forces are required.
3. Straight Retraction
When the arm cylinder is retracted, the arm top
moves horizontally, as oil escaping from the level cyl-
inder flows to the bottom end of the boom cylinders,
raising the boom.
When the bucket cylinders are fully extended and the
bucket comes into contact with the stopper, the
straight retraction cannot be performed. To perform
the straight retraction, retract the arm cylinder after
dumping the bucket slightly.

PROHIBITED OPERATION

1. Never dig with the bucket retracted too closely to the
undercarriage, as the machine components will be
subjected to excessive force.
2. Never dig with the bucket fully retracted and the
bucket teeth stuck in the ground as the front attach-
ment will be subjected to excessive force.
OPERATING THE MACHINE
5-16
M145-05-015
More than 3 m (10 ft)
M117-05-017
WRONG
M117-05-018