Breaker Maintenance - Hitachi 120-3 class Operator's Manual

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
Attachment
Bucket
Hydraulic Breaker
* : 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
100
80
60
Average
Breaker
Operating
Availability
(%)
40
20
0
0
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.
OPERATING THE MACHINE
Changing intervals (Hours)
Availability *Hydraulic Oil Full Flow Filter Element
100%
100%
Replacement Intervals (Hours) of Hydraulic Oil and Full Flow Filter Element
Hours to Replace
Hydraulic Oil
1000 2000
Excavator Operating Hours
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.)
1500
2500 1000
5000
600 100
1000 300
: When using high performance element (micro-glass)
: When using filter-paper element
Replacement Interval when using
1500-hour life time hydraulic oil
Replacement Interval when using
2500-hour life time hydraulic oil
3000
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.)
5-23
**Element Type
Standard Filter Paper
High Performance Element
Standard Filter Paper
High Performance Element
Replacement Interval when
using 5000-hour life time
hydraulic oil
4000 5000
M1U1-05-006