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MAINTENANCE
MAINTENANCE PROCEDURE
REPLACE HYDRAULIC OIL FILTER ELEMENT
WARNING
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.
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 during normal bucket
operations. For details, see "MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER (PAGE 4-17)" 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 6 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.
4. After removing spring (2), valve (3) and strainer (4), take out
element (5).
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 element
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 (PAGE 3-131)" and run the engine at low
idle for 10 minutes.
11. Stop the engine.
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