Komatsu WA380-6 Operation & Maintenance Manual page 109

EXPLANATION OF COMPONENTS
Conditions
More than 10 minutes have passed after the fan started to rotate in reverse and the engine speed has dropped
to less than 1200 rpm.
When portion (b) of the cooling fan automatic reverse rotation switch is pressed again when the fan is rotating
in reverse, and the engine speed has dropped to less than 1200 rpm.
When using automatic reverse rotation function
Switching from normal rotation to reverse rotation
The fan will switch from normal rotation to reverse rotation only if all the following conditions are fulfilled.
If the direction is switched, the cooling fan reverse rotation pilot lamp on the machine monitor will change from
flashing and will stay lighted up.
If all the conditions are not fulfilled, the fan direction will not change.
If the direction is not switched, the cooling fan reverse rotation pilot lamp on the machine monitor will change from
OFF to flashing and will continue to flash.
Conditions
The cooling fan automatic reverse rotation switch is at position (a).
The engine water temperature is less than 90°C (194°F). (The indicator on the engine water temperature gauge
is below horizontal)
The hydraulic oil temperature is less than 90°C (194°F). (The indicator on the hydraulic oil temperature gauge
is below horizontal)
The torque converter oil temperature is below 100°C (212°F). (The indicator on the torque converter oil
temperature gauge is below horizontal)
At least 30 seconds have passed after the engine was started.
The set time for switching has passed.
Switching from reverse rotation to normal rotation
The fan will switch from reverse rotation to normal rotation if both of the following conditions are fulfilled.
If the direction is switched, the cooling fan reverse rotation pilot lamp on the machine monitor will change as follows:
Lighted up -> flashing -> OFF.
If neither of the conditions are fulfilled, the fan direction will not change.
If the direction is not switched, the cooling fan reverse rotation pilot lamp on the machine monitor will change from
being lighted up to flashing and will continue to flash.
Conditions
When the cooling fan automatic reverse rotation switch is set to any position other than portion (a) when the fan
is rotating in reverse, and the hydraulic oil temperature has gone above 50°C (122°F) (the indicator on the
hydraulic oil temperature gauge is in the green range).
When the continuous time for fan automatic reverse rotation has passed and the hydraulic oil temperature has
gone above 50°C (122°F) (the indicator on the hydraulic oil temperature gauge is in the green range).
TORQUE CONVERTER LOCK-UP SWITCH
(If equipped)
For details of the torque converter lock-up, see "HANDLING TORQUE CONVERTER LOCK-UP (PAGE 6-3)" in the
ATTACHMENTS, OPTIONS section.
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OPERATION