24. SERVICE PROCEDURE 24.7.7 REPLACE HYDRAULIC FILTER ELEMENT ¤ WARNING When removing the oil filler cap, turn it slowly to release the internal pressure before removing it. 1. Remove the cap from oil filler F , and release the internal pressure. 2. Loosen 4 bolts, then remove cover 1 . When doing this, the cover may fly out under the force of spring 2 , so hold the cover down when removing the bolts. AM091580 3. After removing spring 2 and valve 3 , take out element 4 . 4. Clean the removed parts in diesel oil. 5. Install a new element in the place where old element 4 was installed. AM091590 6. Set valve 3 and spring 2 on top of the element. 7.
Set cover 1 in position, push it down by hand, and install the cover with the mouning bolts. 9. Screw in the oil filler cap and install the cover. 10. To bleed the air, start the engine according to "12.2 STARTING ENGINE" and run the engine at low idling for 10 minutes. 11. Stop the engine. REMARK Operate the machine after halting for more than 5 minutes to eliminate bubbles in the oil inside the tank. 12. Check for oil leakage and wipe off any spilled oil. When the hydraulic breaker is installed, the hydraulic oil deterio- rates earlier than in normal bucket digging work. The first element replacement should be at 100 to 150 hours for new machines.
Thereafter, replace the element according to the table on the right. Replace the additional filter element for the breaker every approx. 250 hours (when breaker operating ratio is more than 50%) accord- ing to the table on the right. (See “23.2 MAINTENANCE INTERVAL WHEN HYDRAULIC BREAKER”.) 3-64