Motro 3116cargtador 950f serie ii

950F Series II Wheel Loader 2LM00001-UP (MACHINE) POWERED BY 3116 Engine(... Page 1 of 14

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Product: WHEEL LOADER Model: 950F II WHEEL LOADER 2LM Configuration: 950F Series II Wheel Loader 2LM00001-UP (MACHINE) POWERED BY 3116 Engine

Systems Operation
3114 , 3116 and 3126 Engines for Caterpillar Built Machines
Media Number -SENR3583-13 Publication Date-01/10/2008 Date Updated -31/10/2008 i01664183

Fuel System
SMCS - 1250

Fuel System

Illustration 1

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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

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950FSeries II Wheel Loader 2LM00001-UP (MACHINE) POWERED BY 3116 Engine(... Page 2 of 14

(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 tank

Fuel from fuel tank (11) is pulled through an in-line screen (1) by fuel transfer pump (3). The fuel transfer pump is integralwith 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 desired range then the pressure relief valve will open. This will allow the fuel to return to the tank. Thedrilled 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 primingpump 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 Lines Group For The Fuel Filter (3) Fuel transfer pump that is integral with the governor

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950F Series II Wheel Loader 2LM00001-UP (MACHINE) POWERED BY 3116 Engine(... Page 3 of 14

(5) Fuel filter (6) Cylinder head (10) Pressure relief valve (12) Fuel outlet port to the fuel tank (13) Fuel inlet port to the fuel transfer pump (14) Fuel filter base (15) Pressure tap for filtered fuel (16) Tube assembly fromthe fuel filter base to the fuel gallery in the cylinder head (17) Tube assembly from the transfer pump to the fuel filter base

Illustration 3

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Lines Group For The Fuel Filter (1) Screen (6) Cylinder head (7) Pressure regulating orifice (8) Check valve (10) Pressure relief valve (12) Fuel outlet port to the fuel tank (13) Fuel inlet port to the fuel transfer pumphttps://sisweb.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s... 15/09/2010

950F Series II Wheel Loader 2LM00001-UP (MACHINE) POWERED BY 3116 Engine(... Page 4 of 14

(17) Tube assembly from the transfer pump to the fuel filter base (18) Tube assembly from the fuel passage in the cylinder head to the fuel tank

Fuel Transfer Pump

Illustration 4 Fuel Transfer Pump (A) Inletflow of fuel (B) Outlet flow of fuel (1) Screen (if equipped) (2) Inlet check valve (3) Spring (4) Piston assembly (5) Outlet check valve (6) Piston check valve (7) Tappet assembly (8) Camshaft (9) Passage

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The fuel transfer pump is located in the front housing of the governor. The pump is activated by camshaft (8) that is attached to the shaft of the governor drive gear. Piston...