Hitachi ZAXIS 135US-5B Operator's Manual page 251

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 by pressing the breaker down.
OPERATING THE MACHINE
5-31
Pressing Raising
Down 100 to 150 mm
M147-05-016