Komatsu PC118MR-8 Operation And Maintenance Manual page 325

MAINTENANCE
Washing
1. Incline the machine. 
For more details, see "How to incline the machine (4-38)".
2. Swing the revolving frame slowly, so that the water
draining hole (1) on the cab floor is positioned on the lower
side.
3. Rest the work equipment on the ground and position the
machine so that it is stable.
4. Place the lever of the safety device in the LOCK position
(L) and stop the engine.
5. Remove the screws (3) and take out the mat.
6. Remove the plug (2).
7. Wash the floor with water draining the dirt through the hole
(1).
8. After completing the washing operation, put back the plug
(2) and the mat.
WEAM014802
MAINTENANCE PROCEDURES
4-39