PLATE AS 4313857 - Caterpillar

Governor
The fuel rack is connected to the linkage, which controls the fuel injection pump. This linkage is located in the timing case.These engines have a mechanical governor in order to control engine rpm. The governor operates for all engine rpm. The governor weight assembly is installed on the front of the gear of the camshaft. The other components of the governor are installed in the timing gear case.
Illustration 3 g00822233
Governor control mechanism in the timing gear case (1) Connection for the linkage to the fuel injection pump (2) Mechanical stop control (3) Lever return spring (4) Control lever (5) Start spring (6) Arm (7) Governor adjustment screwThe movement of the governor weight assembly is transferred to the fuel rack on the fuel injection pump by control lever (4), arm (6) and the linkage to the fuel injection pump. A spring connects the arm and the control lever. This spring controls the movement of the governor weight assembly on the camshaft. When the angle of the control lever changes, tension on the spring changes. This action controls the linkage to the fuel rack on the fuel injection pump, which controls the engine rpm.The bolt for the maximum speed adjustment is mounted in the cylinder block. This adjustment limits the movement of arm (6). This adjustment should only be made by personnel with the correct training.The bolt for the maximum fuel adjustment is mounted in the cylinder block. This adjustment regulates the fuel injection at high engine rpm. This adjustment should only be made by personnel with the correct training.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.