MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH FILTER SERVICE High Pressure Filters "HPF", illustration Z 21780 NOTICE Carefully inspect elements for damage. Always install new elements if ruptures or other damages are found. 5. Remove element (10) and clean. Take care not to contami- nate the "Clean" inside of the element when flushing. 6. Inspect O-rings (12 and 14) and back-up ring (13). Replace if necessary. 7. Install drain plug (7) with new packing ring (11). Fill filter case (8) half way up with clean hydraulic oil and re-assemble the filter. Make sure element (10) is properly seated in the filter head. 8. After short operating period check filter units for leakage.
In case filter element (10) is soiled by metal chips, examine hydraulic pump for damages. Install new element (10). NOTICE If after cleaning of the filter element, the message "High pressure filter restricted" is displayed again, replace the filter element. Replace elements (10) after three cleanings or after every 5000 operating hours, whichever occurs first. After pump repairs all high pressure filter elements must be replaced. 425 CAUTION