Komatsu D475A-5E0 Operation & Maintenance Manual page 281

SERVICE PROCEDURE SERVICE PROCEDURE
REMARK
Even if the fan rotation selector switch is turned while the engine is
running, the fan does not change its rotation direction.
Then fan rotation selection impossibility lamp (4) flashes, telling
you that the fan rotation cannot be switched.
4. Start up the engine by turning engine starting switch key (1).
The cooling fan begins to turn in the reverse direction.
5. Run the engine at High idle (MAX).
Select the time for running the engine at High idle (MAX) as follows according to the condition of clogging.
Normal clogging: 1 to 2 minutes
Excessive clogging: 2 to 3 minutes
6. After completing the cleaning, run the engine at Low idle (MIN) for approximately 10 seconds.
7. Turn starting switch (1) to OFF position and stop the engine.
REMARK
When the cooling fan is turning for cleaning, power cannot be switched off immediately, even if the engine starting
switch key is turned to OFF position in order to protect the hydraulic circuit.
8. Turn starting switch (1) to ON position.
9. Check that fan reversal lamp (3) is unlighted and start up the
engine. The cooling fan begins to turn in the normal direction.
REMARK
If dirt is caught in the radiator fins, blow with compressed air to clean.
CLEANING WITH COMPRESSED AIR
Directing compressed air, pressurized water, or steam directly at your body, or using these and causing dust to fly may cause
personal injury or death. Always wear protective eyeglasses, anti-dust mask, and other protective equipment.
When performing cleaning, always stop the engine and check that the fan is not rotating. If you touch the fan when it is rotating,
it will cause serious personal injury or death.
NOTICE
When using compressed air for cleaning, blow it keeping some distance to avoid damaging the fins. Damage on the fins can cause
water leakage and overheating. In a dusty job site, check the fins every day, regardless of the maintenance time.
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WARNING
MAINTENANCE MAINTENANCE