Komatsu WA500-6H, Operation & Maintenance Manual

Page: 165 / 412

Operation 3.3 Operation
WA500-6H – VEAM430100
3-99
Clean radiator fins by rotating cooling fan in reverse
WARNING
z If compressed air, high-pressure water, or steam hits your
body directly or dirt is sent flying by the compressed air,
high-pressure water, or steam, there is danger of personal
injyury. Always wear protective glasses, dust mask, and
other protective equipment.
z
Before carrying out cleaning and inspection, always stop the
engine and check that the fan does not rotate. When rotating
the fan, always install the fan net and close the radiator to
prevent anyone from touching the fan.
NOTE
When rotating the fan in reverse, be careful of flying dust and
take steps to prevent cloth or other objects from getting caught
in the fan.
On jobsites where it is easy for dirt to stick to the radiator or
cooler, turn cooling fan reverse rotation switch (1) ON to rotate
the fan in reverse. This will blow off the dirt and dust stuck to the
radiator or cooler, and can extend the cleaning interval.
Method of rotating fan in reverse
NOTE
z When the engine is running, even if the cooling fan reverse
rotation switch is operated, the fan will not rotate in reverse,
but the cooling fan reverse rotation pilot lamp on the main
monitor will flash. Operate this switch only when the engine
is stopped.
z When the fan is rotating in reverse, the pilot lamp on the
main monitor lights up. Do not carry out operations while the
lamp is lighted up. If the fan is run in the reverse direction
during operations, the machine will be unable to display its
performance fully and the engine will tend to overheat. Dur-
ing normal operations, always run the fan in the normal
direction.
z
When stopping the engine with the fan rotating in reverse,
first run the engine at low idling before stopping it.
z
When cleaning the fins by the rotating the cooling fan in
reverse, clean after finishing operations or after warming-up
the hydraulic oil. If the temperature of the hydraulic oil is low,
the fan is held at low speed to protect the hydraulic circuit,
so it will be unable to display its cleaning performance prop-
erly.
GK050121
1