Komatsu PC210LC-6K Operation & Maintenance Manual page 206

24. SERVICE PROCEDURE
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 .
2. Replace element
3-60
WARNING
inside the cap with a new one.