Komatsu PC118MR-8 Operation And Maintenance Manual page 356

MAINTENANCE PROCEDURES
1. Open the side cover (1).
2. Open the lock (2).
3. Loosen the cap (3) slowly to release any residual pressure
from tank.
4. Remove the cover (4).
REMARK
During this operation, the cover is pushed upward by the spring
(5); keep the cover pressed when removing the screws.
5. Remove the spring (5), the valve (6), and extract the filter
cartridge (7).
6. Carefully clean the filter casing and change the cartridge
(7).
7. Reassemble the whole by proceeding in the reverse order,
making sure that the gasket of the cover (4) is not
damaged and is correctly housed in its seat in the tank.
8. Install the oil filler cap (3).
9. Start the engine and let it idle for at least 10 minutes in
order to bleed the circuit.
REMARK
After stopping the engine, wait at least 5 minutes in order to
eliminate all the air bubbles from the oil present in the tank.
10. Check for oil leakages and remove any oil that has been
spilled.
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MAINTENANCE