Komatsu PC220LC -8 Operation & Maintenance Manual page 172

OPERATION
Check Oil Level in Hydraulic Tank, Add Oil
The parts and oil are at high temperature immediately 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.
1. Set the work equipment in the posture shown in the diagram on
the right, then check the oil level and add oil if necessary.
2. If the work equipment is not in the condition shown in the
diagram on the right, start the engine, run the engine at low
speed, retract the arm and bucket cylinder rods fully, then
lower the boom, set the bucket teeth in contact with the ground,
and stop the engine.
3. Within 15 seconds after stopping the engine, move each
control lever (for work equipment and travel) to the full stroke
in all directions to release the internal pressure.
4. Check sight gauge (G) from the right window installed to the
operator's compartment. The oil level should be between the H
and L lines.
NOTICE
Do not add oil above the H line. This will damage the hydraulic equipment
and may cause oil to spurt out. If oil is added above the H line, stop the
engine, wait for the oil temperature to cool down, put a container to catch
the oil under drain plug (P) at the bottom of the hydraulic tank, then drain
the excess oil from the drain plug.
5. If the oil level is below the L line, add oil through oil filler (F) at
the top of the hydraulic tank.
REMARK
The oil level will vary depending upon the oil temperature.
Accordingly, use the following as a guide:
Before starting operation: Between H and L levels
(Oil temperature 10 to 30°C (50 to 86°F))
Normal operation: Around H level
(Oil temperature 50 to 80°C (122 to 176°F))
MACHINE OPERATIONS AND CONTROLS
WARNING
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