TORQUE CONVERTER GP 1T1918 - Caterpillar

Woodward PSG Governor
Schematic Of Latest PSG Governor
(1) Return spring (2) Output shaft (3) Output shaft lever (4) Strut assembly (5) Speeder spring (6) Power piston (7) Flyweights (8) Needle valve (9) Thrust bearing (10) Pilot valve compensating land (11) Buffer piston (12) Pilot valve (13) Pilot valve bushing (14) Control ports (A) Chamber (B) ChamberIntroduction
The Woodward PSG (Pressure Compensated Simple Governor) can operate as an isochronous or a speed droop type governor. It uses engine lubrication oil, increased to a pressure of 1200 kPa (175 psi) by a gear type pump inside the governor, to give hydra/mechanical speed control.Pilot Valve Operation
A gear on the rear of the fuel injection pump camshaft drives a vertical pinion shaft. The pinion shaft turns pilot valve bushing (13) counterclockwise, as seen from the drive unit end of the governor. The pilot valve bushing is connected to a spring driven ballhead. Flyweights (7) are fastened to the ballhead by pivot pins. The centrifugal force caused by the rotation of the ballhead causes the flyweights to pivot out. This action of the flyweights changes the centrifugal force to axial force against speeder spring (5). There is a thrust bearing (9) between the toes of the flyweights and the seat for the speeder spring. Pilot valve (12) is fastened to the seat for the speeder spring. Movement of the pilot valve is controlled by the action of the flyweights against the force of the speeder spring.The engine is at the governed (desired) rpm when