PLATE 3525776 - Caterpillar

Illustration 10 g00319024
Governor Servo (FUEL-OFF Position) (1) Valve. (2) Piston. (3) Cylinder. (4) Cylinder sleeve. (5) Fuel rack. (A) Oil inlet. (B) Oil outlet. (C) Oil passage. (D) Oil passage.When the governor moves toward the FUEL-OFF position, valve (1) moves to the right. The valve closes oil outlet (B) and opens oil passage (D). Pressure oil from oil inlet (A) is now on both sides of piston (2). The area on the left side of the piston is larger. The area on the right side of the piston is smaller. Similarly, the force of the oil is greater on the left side of the piston. This moves the piston and fuel rack (5) to the right.Dashpot
Illustration 11 g00319031
Dashpot (FUEL-ON Position) (1) Cylinder. (2) Piston. (3) Dashpot spring. (4) Spring seat. (5) Needle valve. (6) Check valve. (7) Oil reservoir.When there are sudden speed changes and there are sudden load changes, the dashpot helps the governor with better control of the rpm. The dashpot contains the following components:
Cylinder (1)
Piston (2)
Dashpot spring (3)
Needle valve (5)
Check valve (6) When the governor moves toward the FUEL-ON position, spring seat (4) and piston (2) move to the right. This movement pulls oil from oil reservoir (7) through check valve (6) and into cylinder (1) .Piston (2) and spring seat (4) are fastened to dashpot spring (3).
Illustration 12 g00319123
Dashpot (FUEL-OFF Position) (1) Cylinder. (2) Piston. (3) Dashpot spring. (4) Spring seat. (5) Needle valve. (6) Check valve. (7) Oil reservoir.When the governor moves toward the FUEL-OFF position, spring seat (4) and piston (2) move to the left. This movement pushes oil out of cylinder (1), through needle valve (5), and into oil reservoir (7) .If the governor movement is slow, the oil provides no restriction to the movement of the piston and spring seat. If the governor movement is fast and the governor movement is in the FUEL-OFF position, the needle valve gives a restriction to the oil. The piston and the spring seat will move slowly.Automatic Timing Advance Unit
Illustration 13 g00322244
Automatic Timing Advance Unit (1) Weights. (2) Springs. (3) Slides. (4) Dowels. (5) Automatic timing advance unit.The automatic timing advance unit (5) is installed on the front of the fuel pump drive shaft. Weights (1) in the timing advance are driven by two slides (3). These slides (3) fit into notches that are made on an angle in the weights (1). The slides (3) are driven by two dowels (4) in the hub assembly of the gear assembly in automatic timing advance unit (5) . When the centrifugal force (rotation) moves weights (1) outward against the force of springs (2), a movement of the notches in the weights occurs. This movement (1) causes slides (3) to change the angle between the timing advance gear and the two dowels (4) in the hub assembly.Since automatic timing advance unit (5) drives the fuel pump drive shaft, which is connected to the fuel injection pump camshaft, the fuel injection timing is also changed.Fuel Air Ratio Control
Illustration 14 g00322257
Fuel Ratio Control