MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH FILTER SERVICE Replace pressure filter elements, illust. Z 22515, as follows: 1. Place working equipment on the ground and shut-off the engines. Relieve pressure in the hydraulic system according to page 240 in the operation section. 2. Place a suitable container below the filter in order to collect outflowing oil. 3. Remove plug (A) and drain the oil. 4. Unscrew case (C) of the respective filter and clean the filter case. 5. Discard element (F) with O-ring (G). 6. Inspect O-ring (D) and back-up ring (E), replace if necessary. 7. Install drain plug (A) with new packing ring (B). 8.
Lubricate the thread at the filter head and at filter case (C) with multi-purpose grease K2K. 9. Insert a new element (F) with new O-ring (G). 10. Fill the case (C) half way up with clean hydraulic oil. 11. Screw the case (C) into the head and tighten. 12. After short operating period check filter for leakage. 13. Check restriction indicator (H) for proper mounting and good condition. 429