Hitachi Zaxis 33U-5A Operator's Manual page 314

 Always operate the crusher on a stable, level surface, not
on a slope or on crushed scraps.
 Do not use the crusher to haul or load crushed scraps.
 To prevent the attachment from falling accident, use a
platform when replacing or detaching the attachment.
 If a multiple number of attachments such as crusher and
bucket, or crusher and breaker are used and replaced
with each other at intervals, impurities are more apt to
enter the hydraulic system, the hydraulic oil deteriorates
quickly. For this reason, replace the hydraulic oil tank filter
and change the hydraulic oil at the intervals specified in
the breaker time sharing diagram in the previous section.
 Always remove the crusher from the excavator before
transporting the machine. Do not fully extend the bucket
cylinder when transporting, as this may damage the front
attachment by vibrations during transportation.
OPTIONAL ATTACHMENT
ATTACHMENT PEDAL (HYDRAULIC CRUSHER)
13-12