KCM 70Z7, Operation & Maintenance Manual, Page: 129 / 383

OPERATOR'S STATION
1-68
Fan Reverse Rotation Switch
Fan reverse rotation switch (1) reverses the hydraulic driven
fan. In case the radiator is clogged, rotate the hydraulic driven
fan in reverse direction to blow out the clogged dust. It is
recommended to carry out the fan reverse rotation regularly
to prevent the cooling system from clogging.
OFF
When fan reverse rotation switch (1) is set to OFF position,
the fan turns in normal direction.
AUTO
When fan reverse rotation switch (1) is set to AUTO position,
the fan automatically reverses rotation and then return to
the normal direction.
Normal rotation
J
Reverse rotation
J
Normal rotation
J
The fan rotates in the normal direction for 10 minutes for
the first time.
After that it keeps normal rotation for 30 minutes. The
reverse rotation time is 60 seconds (1 minute). (90 seconds
(1.5 minutes) at low temperature)
In case abnormal situation occurs such as engine coolant
overheating or high refrigerant pressure of the air
conditioner, the duration time of reverse rotation may be
shortened to protect devices from damage.
NOTE: After depressing the AUTO side of this switch, the
fan auto-reversing function remains activated as the switch
position is kept being depressed until it is manually returned
to OFF or ON position.
1
MNEC-01-019
1
AUTO
OFF (Neutral)
ON
70MNDB-01-04