Hitachi 090001, Operator'S Manual

Page: 308 / 442

MAINTENANCE
7-34
Change Hydraulic Oil and Replace Full-Flow Filter
Element
Hydraulic breaker operation subjects the hydraulic system
to become contaminated faster and to quickly deteriorate
the hydraulic oil.
Failure to adhere to proper maintenance intervals may
result in damage to the base machine and the breaker.
In order to extend the service life particularly of the
hydraulic pump, change the hydraulic oil and the full-flow
filter element at the specified frequency given below.
Check machine service hours by using the breaker hour
meter. (Refer to the Breaker Operation in the "OPERATOR’S
STATION" chapter.)
Changing intervals for the high performance element (micro-glass)
Breaker Operating
Availability
0 % 10 % 20 % 30 % 40 % 50 % 60 % 70 % 80 % 90 % 100 %
Full-Flow Filter 1000 670 510 410 340 290 250 230 200 190 170
Hydraulic oil: 2000 hours
life time
2000 1590 1320 1130 990 880 790 710 650 600 560
Hydraulic oil: 5000 hours
life time
5000 2790 1930 1480 1200 1010 870 760 680 610 560
MDAA-07-050
Av
er
age Br
eaker Oper
ating A
vailabilit
y (%)
Changing Intervals (hour)
100
80
90
70
50
30
10
60
20
40
0
0 1000 500 1500 2500 3500 4500 2000 3000 4000 5000
Changing Interval when using 5000-hour life time hydraulic oil
Changing Interval when using 2000-hour life time hydraulic oil
Element Replacement Intervals
When Using High Performance Element