Komatsu PC290LC-6K, Operation & Maintenance Manual

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3-64
PC290-ENG
24.6.5 REPLACE HYDRAULIC TANK BREATHER
ELEMENT
Wait for the oil to cool down before replacing the breather ele-
ment. When removing the oil filler cap, turn it slowly to release
the internal pressure, then remove it carefully.
1. Remove the cover over the hydraulic tank and remove the cap of oil
filter
F
.
2. Replace element
a
inside the cap with a new one.
WARNING
24. SERVICE PROCEDURE
24.6.6 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 a.
When doing this, the cover may fly out under the force of spring b, so
hold the cover down when removing the bolts.
3. After removing spring b and valve c, take out element d.
4. Clean the removed parts in diesel oil.
5. Install a new element in the place where old element d was installed.
6. Set valve c and spring b on top of the element.
7. Set cover a in position, push it down by hand, and install the cover
with the mouning bolts.
8. Screw in the oil filler cap and install the cover.
9. To bleed the air, start the engine according to “12.2 STARTING EN-
GINE” and run the engine at low idling for 10 minutes.
10. Stop the engine.
REMARK
Operate the machine after halting for more than 5 minutes to liminate
bubbles in the oil inside the tank.
11. Check for oil leakage and wipe off any spilled oil.
When the hydraulic breaker is installed, the hydraulic oil deteriorates
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 addititional filter elemnt for the breaker every approx.
250 hours (when breaker operating ratio is more than 50%) accord-
ing to the table on the right. (See “24.2.11 REPLACE ADDITIONAL
BREAKER FILTER ELEMENT”.)