PLUG AS-CONNECTOR 1471443 - Caterpillar

Illustration 1 g03486201
Schematic for the hydraulic fan system
(1) Gear pump
(2) Cold start bypass valve (if equipped)
(3) Brake/Fan charge valve
(4) Demand fan solenoid valve
(5) Transmission ECM
(6) Fan Reversing Valve (if equipped)
(7) Hydraulic fan gear motor (Dual direction shown)
(8) Radiator
(9) Hydraulic oil cooler bypass check valve
(10) Hydraulic oil cooler
(11) Filter
(12) Case drain screen
(13) Breather
(14) Hydraulic tank
Illustration 2 g06111823
Hydraulic Fan System
(1) Gear pump
(3) Brake/Fan charge valve
(4) Demand fan solenoid valve
(9) Hydraulic oil cooler bypass check valve
Illustration 3 g06111783
Hydraulic Fan System
(1) Gear pump
(6) Fan Reversing Valve (if equipped)
(7) Hydraulic fan gear motor (Dual direction shown)Gear pump (1) is mounted next to the engine on the right side of the machine. Gear pump (1) draws oil from hydraulic oil tank (14) through the inlet of the pump. High-pressure oil then flows to brake/fan charge valve (3). If equipped with a cold start bypass valve (2), the engine ECM will signal the valve to allow the oil to recirculate. As the oil warms up, the bypass valve will move to the CLOSED position. Brake/fan charge valve (3) directs oil to either the braking system or to hydraulic fan gear motor (7). The braking system has priority. When oil is not required by the braking system, the oil is directed to hydraulic fan motor (7). Hydraulic fan gear motor (7) is located at the rear of the machine between radiator (8) and the engine. Pressurized oil from brake/fan charge valve (3) flows into the inlet of hydraulic fan gear motor (7). The flow of the hydraulic oil causes hydraulic fan gear motor (7) to rotate the fan blades. The rotation of the fan forces cool air to flow through the cooling package.The demand fan solenoid valve (4) controls the speed of the fan. The demand fan solenoid valve (4) allows the speed of the fan to decrease in cool ambient temperature or in a light work application. The demand fan valve is controlled by the transmission ECM (5). Engine ECM will interpret the data from the four sensors and will send a change in current to transmission ECM (5). The transmission ECM (5) will send the command to demand fan speed solenoid. Adjustment to fan speed should be done using the fan calibration screen in Electronic Technician.After the hydraulic oil exits hydraulic fan gear motor (7), the oil flows through a hydraulic oil line to hydraulic oil cooler (10). Hydraulic oil cooler bypass valve (9) limits the maximum oil pressure in hydraulic oil cooler (10) to 450 kPa (65 psi). As cold hydraulic oil enters the hydraulic oil cooler, the oil pressure will increase. Hydraulic oil cooler bypass valve (9) will open. As the temperature of the oil increases, the pressure of the oil decreases. The force of the spring in the bypass valve (9) is greater than the force of the oil pressure that is acting on the spring. This force allows the bypass valve (9) to close. The hydraulic oil flows through hydraulic oil cooler (10), through hydraulic oil filter (11), and then into hydraulic tank