Komatsu D475A-5E0 Operation & Maintenance Manual page 267

SERVICE PROCEDURE SERVICE PROCEDURE
11. Open reserve tank cap (6), add coolant to the specified level
in reference to "CHECK COOLANT LEVEL, ADD COOLANT
(PAGE 3-88)", and then close cap (6).
12. Stop the engine, wait for approximately 3 minutes, add coolant
up to the mouth of the filler port, and tighten the radiator cap (3).
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MAINTENANCE MAINTENANCE