Hitachi Zaxis 17U-5A Operator's Manual page 258

Raising the front part of the undercarriage by pressing
down the breaker may cause damage to the front
attachment.
Do not raise the front part of the undercarriage 150 mm or
more by pressing down the breaker.
Do not operate breaker with the boom swing operation
Do not operate the breaker for long period of time while
swinging the boom.
Failure to do so may shorten the service life of the main
frame.
OPTIONAL ATTACHMENT
ATTACHMENT PEDAL (HYDRAULIC BREAKER)
Pressing Raising
Down 10 to 15 cm
OK
13-8
M147-05-016
MADB-13-044