KIT-SEAL 1171105 - Caterpillar

Illustration 1 g00708473
Location of the Fan Drive Pump (1) Case drain. (2) Pilot signal pressure. (3) Fan drive pump. (4) Pressure and flow compensator valve. (5) Outlet. (6) Inlet.Fan drive pump (3) is mounted on the right side of the engine toward the rear of the machine. Fan drive pump (3) is a piston pump that is driven by the camshaft gear. The fan drive pump is a variable displacement pump. The fan drive pump only functions when the engine is in operation.
Illustration 2 g00708485
Piston Pump (Fan Drive) (3) Housing for the fan drive pump. (4) Pressure and flow compensator valve. (7) Piston. (8) Cylinder barrel. (9) Port plate. (10) Drive shaft. (11) Swashplate. (12) Shoe plate. (13) Head. (14) Piston rod. (15) Actuator piston. (16) Spring seat. (17) Spring.When drive shaft (10) is rotated, cylinder barrel (8), pistons (7), and shoe plates (12) turn when the engine is running. The remainder of the pump components are fastened to the pump housing (3) .Oil from the hydraulic oil tank flows into pump head (13) at the inlet passage. The oil flows through inlet passages in port plate (9). As drive shaft (10) turns, the openings of the cylinder barrel move by the inlet passages of port plate (9) .Each piston (7) inside cylinder barrel (8) is held against swashplate (11) by shoe plate (12). Swashplate (11) can be at any angle between the maximum and the minimum angles.As pistons (7) follow the angle of swashplate (11), the pistons move in and out of cylinder barrel (8). When a piston (7) moves out of cylinder barrel (8), oil is pulled in behind the piston.The angle of swashplate (11) determines the amount of oil that is drawn into each cylinder barrel (8). As the barrel assembly continues to rotate the swashplate angle pushes the pistons into the barrel.The pistons push oil out of cylinder barrel (8) through the outlet passages in port plate (9). The angle of the swashplate determines the amount of oil that is pumped out of each cylinder barrel (8) for each drive shaft rotation.There are an infinite number of positions for the swashplate angle between the neutral angle and the maximum angle. A greater swashplate angle will result in more oil flow through port plate (9). The increased oil flow passes through port plate (9) to the outlet passage.With swashplate (11) at a minimum, pistons (7) do not move in and out of the rotating cylinder barrel (8). No oil is drawn into the pump and no oil is pumped out of the pump. The pump has zero displacement and zero flow.When the swashplate (11) is at the maximum angle the pump is at the maximum displacement and full flow.The swashplate angle is controlled by the actuator piston (15). Actuator piston (15) is activated by oil pressure from pressure and flow compensator valve (4) .Reference: For additional information about the specifications for the fan drive pump, refer to the Service Manual module Specifications, "Piston Pump (Fan Drive)" for