Komatsu PC118MR-8 Operation And Maintenance Manual page 354

MAINTENANCE PROCEDURES
2. Open the lock (2).
3. Loosen the oil filler cap (3) slowly.
4. Remove the drain plug (P) and let all the condensate flow
out of the tank. Collect the condensate in a container with
suitable capacity.
5. Refit the oil filler cap (3) and lock (2).
6. Close the side cover (1).
NOTICE
The tank must be drained before starting the engine, with
temperatures exceeding 0°C; when the temperature is
below 0°C, the tank must be drained at the end of work or
in any case with the machine at operating temperature, in
order to prevent the condensate from freezing.
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MAINTENANCE