IDLER-PULLEY 4744113 - Caterpillar

1. Disconnect fuel lines (1) from the fuel injection pump housing.2. Remove bolts (2) that hold the bracket assemblies and the fuel injection lines to the engine.
Do not let the tops of fuel nozzles turn when the fuel line nuts are tightened. The nozzles will be damaged if the top of the nozzle turns in the body. The engine will be damaged if a defective fuel injection nozzle is used because the shape of fuel (spray pattern) that comes out of the nozzles will not be correct.
3. Use two wrenches, one to hold fuel nozzles (3) so they will not turn and one to disconnect fuel lines (1) from the nozzles.4. Remove the fuel lines from the engine.5. Put caps and plugs on the nozzles, fuel lines and fuel injection pump housing to keep dirt out of the fuel system.Install Fuel Injection Lines
1. Make sure the fuel injection lines are clean and dry.2. Put fuel injection lines (1) in position, and connect them to the fuel injection pump housing.
Do not let the tops of fuel nozzles turn when the fuel lines are loosened. The nozzles will be damaged if the top of the nozzle turns in the body. The engine will be damaged if a defective fuel injection nozzle is used because the shape of fuel (spray pattern) that comes out of the nozzles will not be correct.
3. Use a wrench to hold nozzles (3) so they will not turn, and connect fuel lines (1) to the nozzles. Use a torque wrench and tooling (A) to tighten the fuel injection line nuts to a torque of 40 7 N m (30 5 lb. ft.).4. Install bolts (2) that hold the bracket assemblies and the fuel injection lines to the engine.5. Remove (bleed) the air from the fuel system. See Testing And Adjusting.