Method For Replacing Hydraulic Oil Filter Element - Komatsu PC290LC-11 Operation & Maintenance Manual

MAINTENANCE PROCEDURE
If the structure is welded, or holes are drilled in it, or it is repaired in any other way, its strength may be reduced.
Consult your Komatsu distributor before carrying out any repairs.

METHOD FOR REPLACING HYDRAULIC OIL FILTER ELEMENT

• Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury. Accordingly, wait until they have cooled down before starting the work.
• When removing the oil filler cap, the oil may spout out. Turn it slowly to release the internal pres-
sure, then remove it.
NOTICE
If the machine is equipped with a hydraulic breaker, the hydraulic oil deteriorates faster than in the nor-
mal bucket digging operation. Accordingly, perform maintenance referring to "MAINTENANCE INTER-
VAL FOR HYDRAULIC BREAKER (4-13)".
Items to be prepared
Container to catch drained oil
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 for oil filler (F), and release the internal
pressure.
3.
Loosen the bolts (6 pieces) and remove cover (1).
The cover may be jumped out by spring (2). While pressing down the cover, remove the bolts.
REMARK
If cover (1) is left approximately 5 minutes with the mount-
ing bolts loosened, the internal pressure of the case is re-
leased and the oil in the element is drained, and accord-
ingly less oil drips when the element is removed.
4.
After removing spring (2), valve (3) and strainer (4), take
out element (5).
5.
Check the bottom of the filter case for dirt or other materi-
al, and remove any if found.
Take extreme care that the dirt does not fall into the hy-
draulic tank.
6.
Clean the removed parts by using cleaning oil.
4-56
k k
WARNING
MAINTENANCE