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MAINTENANCE
EVERY 1000 HOURS MAINTENANCE
Maintenance for every 250 and 500 hours service should be carried out at the same time.
REPLACE HYDRAULIC OIL FILTER ELEMENT
The parts and oil are at high temperature 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 dur-
ing normal bucket operations. For details, see "MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER (
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.
5. Clean the removed parts in diesel 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 ele-
ment.
8. 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 "STARTING
ENGINE ( 3-77 )" and run the engine at low idling for 10
minutes.
11. Stop the engine.
WARNING
.MAINTENANCE PROCEDURE
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4-51
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