Komatsu WA200-8 Operation & Maintenance Manual page 340

MAINTENANCE PROCEDURE
NOTICE
If the oil is added to above the H mark, stop the engine and
wait for the oil to cool down. Then drain the excessive oil
through the drain plug (P). It may damage the oil circuit
and cause the oil to spurt out.
1.
Lower the bucket to the ground and stop the engine.
2.
Wait for more than 5 minutes after the engine is stopped,
and check the oil level with the sight gauge (G).
If the oil level is between H and L of sight gauge (G), it is
proper.
3.
If the oil level is below the L mark, add oil according to the following procedure.
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MAINTENANCE