Hitachi ZAXIS 135US-5B Operator's Manual page 316

Replacement of Full-Flow Filter
--- every 300 hours
Demolition and logging work
When the hydraulic oil filter alarm on the monitor panel is lit,
immediately replace the filter element.
d
CAUTION: Hydraulic oil becomes hot and pressurized
during operation. Severe burns may result if
skin comes in contact with escaping hydraulic oil
immediately after operation. Wait for the oil to cool
before starting any maintenance work.
IMPORTANT: Changing interval differs according to the
brand of hydraulic oil used, kind of filter element or
average attachment operating availability.
IMPORTANT: Precautions for the filter element
 Excavators engaged in demolition and logging work
use full-flow filter with high performance (micro-
glass) element.
 When replacing the element, use the same kind of
high performance element.
 In case a filter-paper element is unavoidably used,
change hydraulic oil and replace full-flow filter
element by referring to the "Change Hydraulic
Oil and Replace Full-Flow Filter Element" in the
OPERATING THE MACHINE section.
 If a filter-paper element is used, the full-flow filter
restriction indicator does not operate. Isolate the
circuit for full-flow filter restriction indicator (6).
MAINTENANCE
7-42
M104-07-021
6
MDAA-07-005