Komatsu Galeo PC800-8 Shop Manual page 282

SEN00386-03
13. Fan reverse function
• The cooling devices can be cleaned easily by ro-
tating the fan in reverse.
• The fan rotation direction is reversed by operat-
ing the machine monitor.
• Upon receiving the fan reverse signal from the
machine monitor, the pump controller drives the
fan reverse EPC valve of the fan motor to change
the fan reverse valve. By this operation, the fan
rotation direction is reversed.
• The fan speed in reverse direction is controlled
by only the engine speed, regardless of the am-
bient temperature, hydraulic oil temperature, and
coolant temperature.
• The auto-deceleration function is canceled dur-
ing the fan reverse operation. Accordingly, the
engine speed does not lower even if the levers
are set in neutral.
• Since the main pump delivery is minimized, the
normal operation cannot be carried out.
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10 Structure, function and maintenance standard
PC800, 850-8