Komatsu PC450-8 Operation & Maintenance Manual page 285

MAINTENANCE
MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER
For machine equipped with a hydraulic breaker, the hydraulic oil deteriorates faster than for normal bucket dig-
ging operations, so set the maintenance intervals as follows.
q
Replace hydraulic filter element
On a new machine, replace the element after the first 100
to 150 hours, then carry out further replacement of the ele-
ment according to the table on the right.
q Change oil in hydraulic tank
Change the oil according to the table on the right.
q
Replacing additional filter element for breaker (if
equipped)
Use a guideline of 250 hours for use of the breaker (operat-
ing ratio for the breaker: 50 % or more), and replace the
element according to the table on the right.
X : Breaker operating ratio (%)
Y : Replacement interval (H)
(A): Hydraulic filter element
(B): Hydraulic oil
(C): Additional filter element
REMARK
Breaker operating ratio 100% means that only the breaker is
used
Breaker operating ratio 0% means that the breaker is not used
MAINTENANCE SCHEDULE
4-19
4