SEAL ASSEM. 9J5558 - Caterpillar

Type I Fuel System
Illustration 1 g00712565
Fuel system schematic (A) Fuel priming pump (if equipped) (1) Screen (if equipped) (2) Inlet check valve (3) Fuel transfer pump that is integral with the governor (4) Outlet check valve (5) Fuel filter (6) Cylinder head (7) Pressure regulating valve (8) Check valve (9) Primary fuel filter (if equipped) (10) Fuel tankFuel from fuel tank (10) is pulled through an in-line screen (1) by fuel transfer pump (3). The fuel transfer pump is integral with the governor. Fuel is sent from the fuel transfer pump through fuel filter (5) to a drilled passage in the cylinder head (6). The drilled passage in the cylinder head intersects a gallery around each unit injector in order to provide a continuous flow of fuel to all injectors.When there is air on the inlet side of the fuel system, fuel priming pump (A) (if equipped) may be used in order to fill the fuel filter and the fuel gallery that is in the cylinder head. This is performed before the engine is started. When the priming pump is used, check valves that are located in the fuel priming pump control the movement of the fuel. The fuel is forced through the low pressure side of the fuel system. This removes air from the fuel lines and components back into the fuel tank.
Illustration 2 g00712706
Lines group for the fuel filter (3) Fuel transfer pump that is integral with the governor (5) Fuel filter (6) Cylinder head (11) Fuel outlet port to the fuel tank (12) Fuel inlet port to the fuel transfer pump (13) Fuel filter base (14) Pressure tap for filtered fuel (15) Tube assembly from the fuel filter base to the fuel gallery in the cylinder head (16) Tube assembly from the transfer pump to the fuel filter base
Illustration 3 g00712708
Lines group for the fuel filter (view A-A) (1) Screen (6) Cylinder head (7) Pressure regulating orifice (8) Check valve (11) Fuel outlet port to the fuel tank (12) Fuel inlet port to the fuel transfer pump (16) Tube assembly from the transfer pump to the fuel filter base (17) Tube assembly from the fuel passage in the cylinder head to the fuel tankType II Fuel System
Illustration 4 g00690661
Fuel system schematic (A) Fuel priming pump (if equipped) (1) Screen (if equipped) (2) Inlet check valve (3) Fuel transfer pump that is integral with the governor (4) Outlet check valve (5) Fuel filter (6) Cylinder head (7) Pressure regulating valve (8) Check valve (9) Primary fuel filter (if equipped) (10) Pressure relief valve (11) Fuel tankFuel from fuel tank (11) is pulled through an in-line screen (1) by fuel transfer pump (3). The fuel transfer pump is integral with the governor. Fuel is sent from the fuel transfer pump through the pressure relief valve (10). The pressure relief valve is closed in normal operation. Fuel will enter through fuel filter (9) to a drilled passage in the cylinder head (6). Once the pressure of the fuel is greater than the