Hitachi ZAXIS 120-6 class Operator's Manual page 520

HYDRAULIC BREAKER, HYDRAULIC CRUSHER AND QUICK COUPLER
Raising the Front Part of the Undercarriage by Pressing
Down the Breaker May Cause Damage to the Front
Attachment
Never raise the front edge of the undercarriage higher than
150 mm (6 in) by pressing the breaker down.
Machine storing position with breaker
After operating the machine, be sure to place the breaker
horizontally on the ground. Do not leave cylinders at their
stroke end position. Failure to do so may damage the
cylinder.
OPTIONAL ATTACHMENTS AND DEVICES
Pressing Raising
Down 100 to 150 mm
Place horizontally
13-22
Do not leave cylinders at their stroke end
position.
M147-05-016
MJAD-05-001