Hitachi 120-3 class User Manual

MAINTENANCE
7-29
BREAKER MAINTENANCE
Change Hydraulic Oil and Replace Hydraulic Oil Tank Filter
Hydraulic breaker operation subjects the hydraulic system to
become contaminated faster and to quickly deteriorate the hy-
draulic oil. For this reason, hydraulic oil must be changed and
the hydraulic oil tank filter must be replaced more often than
the machine equipped with a bucket. Failure to do so may
result in damage to the breaker, hydraulic oil pump, and other
related hydraulic system components. Recommended
changing intervals are shown below. (For filter replace-
ment and oil changing intervals are shown below. (For
filter replacement and oil changing procedures, refer to
the “Hydraulic System” in the “MAINTENANCE” Section.)
IMPORTANT: Use a high performance element (micro-
glass) on excavators engaged in demolition
and logging work. In case using a filter-pa-
per element is unavoidable, replace hydrau-
lic oil and the filter element at the intervals
as illustrated with dotted lines.
NOTE: Full-flow filter restriction indicator is optional.
If a filter-paper element is used, this indicator
does not operate. (Refer to the Hydraulic System
in the Maintenance section.)
Excavator Operating Hours
Attachment Availability *Hydraulic Oil Full Flow Filter Element **Element Type
Bucket 100%
1500
1000
Standard Filter Paper
High Performance Element
2500
5000
Hydraulic Breaker 100%
600 100 Standard Filter Paper
1000 300 High Performance Element
Changing intervals (Hours)
* : Replacement intervals differ depending on the brand of hydraulic oil used. Refer to the Hydraulic System in the MAIN-
TENANCE section.
** : Use the high performance element (micro-glass) on excavators engaged in demolition and logging work.
Hours to Replace
Element
Average
Breaker
Operating
Availability
(%)
Replacement Intervals (Hours) of Hydraulic Oil and Full Flow Filter Element
Hours to Replace
Hydraulic Oil
Replacement Interval when using
1500-hour life time hydraulic oil
Replacement Interval when
using 5000-hour life time
hydraulic oil
Replacement Interval when using
2500-hour life time hydraulic oil
: When using high performance element (micro-glass)
: When using lter-paper element
4000
300020001000
0
0
20
40
60
80
100
5000
M1U1-05-006

Hitachi 120-3 class Specifications

General

Brand	Hitachi
Model	120-3 class
Category	Excavators
Language	English