EXTENSION AR-SCREED 2889422 - Caterpillar

Illustration 4 g01384576
Governor control mechanism in the front housing with a BCD (1) Connection for the linkage to the fuel injection pump (2) Control lever (3) Governor main spring (4) Angleich (5) Governor lever (6) Start springThe movement of the governor weight assembly is transferred to the fuel rack on the fuel injection pump by the control lever (2) , the governor lever (5) and the linkage to the fuel injection pump. The governor main spring (3) connects the governor lever to the control lever. The governor main spring controls the movement of the governor weight assembly on the camshaft. When the angle of the control lever changes, the tension on the governor main spring changes. This action controls the linkage to the fuel rack on the fuel injection pump, which controls the engine rpm.The maximum fuel adjustment screw is mounted in the front housing. This adjustment regulates the fuel injection at high engine rpm. This adjustment should only be made by personnel with the correct training.The fuel injection pump timing, the low idle, and the high idle are preset at the factory. Adjustments to the pump timing and idle rpm should only be made by personnel that have had the correct training. The timing for the fuel injection pump should only change if the camshaft or the cylinder block are replaced. The fuel injection pump timing should not change if the fuel injection pump is reinstalled with a shim that is the same size.The fuel rack automatically returns to the excess fuel position when the engine is stopped. The excess fuel position aids the cold starting of the engine.A spring connects the linkage to the fuel injection pump and mechanical stop control (2) . When the engine is first started, the spring automatically increases the fuel flow to the cylinders.Boost Compensation Device for Turbocharged Engines (if equipped)
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Boost Compensation Device (BCD) (1) Adjustment screw (2) Diaphragm piston (3) Stopper (4) Intake manifold pressure inlet (5) Governor leverIf equipped, the Boost Compensation Device (BCD) can be installed on turbocharged engines. The BCD prevents overfuelling and the production of black smoke during acceleration from low idle.When the engine is accelerated from a low rpm, the governor lever (5) on the fuel rack comes into contact with the BCD fuel stopper (3) in order to prevent excessive movement of the governor lever. This prevents overfuelling.As the engine rpm increases, the increased intake manifold pressure is felt on the diaphragm in the BCD. As the BCD fuel stopper is moved by the diaphragm piston, the governor lever is allowed to operate over the full range.Fuel Injection Pump
Illustration 6 g00746909
Fuel injection pump (typical example) (1) Fuel line to the fuel injection nozzles (2) Fuel delivery valve (3) Nuts and bolts for mounting the fuel injection pump to the cylinder block (4) Shim (5) Vent screw for the fuel injection pump (6) Fuel flow from the fuel transfer pumpThe engines have the energized-to-run system for starting the engine and stopping the engine. The electric fuel