Hitachi 120-3 class Operator's Manual page 172

Hydraulic excavator

Table of Contents

• Do not operate breaker with the arm positioned vertically.

Excessive vibration to the arm cylinder will occur, causing

oil leakage.

• Press the breaker so that the chisel (the axis) is positioned

and thrust perpendicular to the object.

• Do not operate the breaker continuously longer than one

minute. Excessive chisel wear will result. If an object could

not be broken within one minute, apply the chisel to

other locations, less than one minute for each location.

• Raising the front part of the undercarriage by pressing

down the breaker may cause damage to the front attach-

ment. Although raising the front edge of the undercar-

riage up to 150 mm (6 in) is tolerable, do not practice this

method more than necessary. Never raise the front edge

of the undercarriage higher than 150 mm (6 in) by press-

ing the breaker down.

OPERATING THE MACHINE

Raising 100 to

If an object could not be broken

within one minute, apply the

chisel to other locations, less than

one minute for each location.