UNIVERSAL JOINT GP 3299658 - Caterpillar

Illustration 1 g06095562
Fan Hydraulic System
(1) Hydraulic Oil Cooler
(2) Fan Motor
(3) Full Flow Return Filter
(4) Hydraulic Tank
(5) Fan
(6) Brake/Fan Pump
(7) Engine ECM
(8) Combination Valve
(9) Brake/Fan FilterHydraulic Fan Operation
The main components of the fan hydraulic system are piston motor (2) and piston pump (6).Piston pump (6) draws oil from hydraulic tank (4).Piston pump (6) sends oil to piston motor (2) through high-pressure filter (9) and fan control valve (8).The amount of oil that is sent to the motor by the pump is regulated by engine ECM (7). Engine ECM (7) adjusts the current to the pump compensator valve. The pump compensator valve controls the pressure of the oil that is sent to piston motor (2). When higher pressure is maintained, fan motor (2) turns faster. Brake/Fan piston pump (6) will increase flow to maintain the desired pressure.The oil from the outlet side of piston motor (2) flows through hydraulic oil cooler (1) and full flow return filter (FFRT) (3) that is located in hydraulic tank (4). Case drain oil from piston pump (6) and fan motor (2) flow through case drain oil filter (9). All case drains go to the hydraulic oil screens in the tank.If the machine is equipped with the optional axle oil cooler attachment, oil coming out of the cooler is diverted to heat exchangers located in the axles prior to returning to the hydraulic tank.When the hydraulic oil is cold, the flow will bypass hydraulic oil cooler (1). After the hydraulic oil warms, the oil will flow through hydraulic oil cooler (1) in order to keep the oil at a predetermined temperature.Hydraulic fan (5) provides cooling air flow across the cooler group.