GLASS-FRONT LH 3067873 - Caterpillar

Illustration 1 g01232906
Left Side of Engine Compartment (1) Cooling fan manifold (2) Cooling fan solenoid (3) Relief valveCooling fan manifold (1) is mounted to the left wall of the engine compartment. The engine compartment cover provides access to this component.Cooling fan solenoid (2) is installed in cooling fan manifold (1). The machine ECM controls this proportional solenoid. This solenoid controls the amount of oil which is allowed to flow through the cooling fan motor. The strength of the signal from the machine ECM is inversely proportional to the fan speed. The lower the signal, the higher the fan speed.Cooling fan solenoid (2) contains internal relief valve (3). The relief valve controls the pressure in the fan circuit. This relief valve can be adjusted in order to change the maximum fan speed. An increase in the fan pressure causes an increase in fan speed. Likewise, a decrease in fan pressure causes a decrease in fan speed.