HARNESS AS-HITCH 4445924 - Caterpillar

Solenoid (Travel Speed Shift Change)
The solenoid (Travel Speed Shift Change) is an output of the machine ECM. The solenoid (Travel Speed Shift Change) sets the travel speed of the machine. The travel speed depends on the delivery pressure of the main pump. If the delivery pressure of the main pump is high, the solenoid (Travel Speed Shift Change) is de-energized. When the delivery pressure of the main pump is low, the solenoid (Travel Speed Shift Change) is energized. Swing Brake Solenoid
The swing brake solenoid is a output of the machine ECM. The swing brake solenoid is energized in order to release the swing brake. The swing brake solenoid is de-energized approximately 6.5 seconds after any lever is moved to NEUTRAL position, except the travel levers/pedals. Hydraulic Lock Solenoid
The hydraulic lock solenoid is an output of the machine ECM. The hydraulic lock solenoid is energized in order to enable the primary hydraulic pressure. The hydraulic lock solenoid is de-energized in order to disable the primary hydraulic pressure.Radiator Fan Solenoids
Illustration 6 g01155931
Radiator Fan Speed Solenoid 365C Solenoid Valve (Fan Speed)
The radiator fan speed solenoid is an output of the machine ECM. The solenoid valve is used to regulate the speed of the radiator fan. The fan speed is calculated by the machine ECM. The solenoid is a proportional type. The ECM uses a pulse width modulated signal (PWM) in order to control the travel of the solenoid valve. The ECM uses a pulse width modulated signal (PWM) in order to control the speed of the fan. The duty cycle of the PWM signal varies according to the temperature inputs that are listed:
Engine coolant temperature
Temperature of the Engine suction air
Hydraulic oil temperatureWhen the monitored temperatures are lower than the desired temperature, the ECM increases the current to the solenoid (low fan speed). When the monitored temperatures are higher than the desired temperature, the ECM decreases the current to the solenoid (high fan speed). The ECM MAY increase the PWM