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MAINTENANCE PROCEDURE
REPLACE HYDRAULIC OIL FILTER ELEMENT
q
The parts and oil are at high temperature immediately after the engine is stopped, and may cause
burns. Wait for the temperature to go down before starting the work.
q
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
NOTICE
If the machine is equipped with a hydraulic breaker, the hydraulic oil will deteriorate much faster than dur-
ing normal bucket operations. For details, see "MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER
(4-19)" when carrying out maintenance.
1. Set the work equipment on the hard and flat ground in the
maintenance posture as shown in the figure, then lower it
to the ground and stop the engine.
2. Remove the cap from oil filler (F), and release the internal
pressure.
3. Loosen 4 bolts, then remove cover (1).
When doing this, the cover may fly out under the force of
spring (2), hold the cover down when removing the bolts.
4. After removing spring (2), valve (3) and strainer (4), take
out element (5).
q
Inspect the bottom of the filter case for dirt, and
remove it, if any. Take good care then not to let fall the
dirt into the hydraulic tank.
REMARK
If the mounting bolts of cover (1) loosened in Step 3 are left for
approx. 5 minutes, the internal pressure inside the case will be
released, so if the element is removed when the oil in the ele-
ment has drained out, the amount of dripping oil will be
reduced.
5. Clean the removed parts in flushing oil.
6. Install the new element in the place where old element (5)
was installed.
7. Set valve (3), strainer (4) and spring (2) on top of the element.
8. Set cover (1) in position, push it down by hand, and install the cover with the mounting bolts.
9. Screw in the oil filler cap and install the cover.
10. To bleed the air, start the engine according to "STARTING ENGINE (3-128)" and run the engine at low idle for
10 minutes.
11. Stop the engine.
4-70
WARNING
MAINTENANCE
4
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