MAINTENANCE 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 fil- ter replacement and oil changing procedures, refer to the “Hydraulic System” in the “MAINTENANCE” Section.) 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 work. Replacement Intervals (Hours) of Hydraulic Oil and Full Flow Filter Element Hours to Replace Element Hours to Replace Hydraulic Oil 100 : When using high performance element (micro-glass) :
When using filter-paper element 80 Replacement Interval when using 1500-hour life time hydraulic oil Average Breaker Operating Availability (%) 60 Replacement Interval when using 2500-hour life time hydraulic oil 40 Replacement Interval when using 5000-hour life time hydraulic oil 20 4000 3000 2000 1000 0 0 5000 Excavator Operating Hours IMPORTANT: Use a high performance element (micro- glass) on excavators engaged in demolition work. In case using a filter-paper element is unavoidable, replace hydraulic 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.) 7-38 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