MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH FILTER SERVICE G Replace return oil filter elements G Replace leakage oil filter element G Check filter screens Follow the steps shown in illust. Z 19336: 1. Loosen bolt (1). 2. Turn retainer (2). 3. Remove cover assy (3). Inspect O-ring (4) and replace if necessary. 4. Lift out element assy (5). 5. Disassemble filter assy (5) in sequence of ref. nos. (6 to 12) 6. Discard element (8) 7. Inspect screen (11) and clean if necessary. NOTICE Take care not to contaminate the clean inside of the screen when flushing. 8. Inspect screen (11) and O-ring (12) for damage replace if necessary.
Install screen (11) use new sealing washer (10) and self locking nut (9). 9. Reassemble filter assy (5) with new element (8) according to step 5. Use new self locking nuts (6). 10. Install filter assy use new gasket (7). Torque bolt (1) to 850 Nm. NOTICE G After each repair of the hydraulic system the elements (8) should be replaced after about 50 operating hours. G The filter elements must also be replaced when the fault message "Filter restriction" is displayd on the ECS screen. G Replace screens (11) every 5000 operating hours at the latest. 419