GUARD AS 5667838 - Caterpillar

Flow Control Under No Load
Illustration 1 g01958568
Regulation of pump flow (no-load condition) (1) Spring (2) Spring (3) Blade pump (4) Swashplate (5) Pin (6) Passage (7) Piston (8) Passage (9) Piston (10) Piston (11) Piston (12) Piston (13) Passage (14) PistonThe main pump output varies from maximum output to minimum output according to the load on the machine. The angle of the swashplate determines the actual output of the main pump.Swashplate at Maximum Angle
When the machine is not operating, the swashplate is maintained at a maximum angle by spring (1). During machine operation, the swashplate angle is varied according to the delivery pressure of the pumps and the load on the machine.When the load on the machine is light, the delivery pressure from the drive pump and the idler pump is low and spring (1) is not compressed by the force of pump's pistons. Therefore, the swashplate maintains the maximum angle, and the pump output is maintained at the maximum flow.As the load on the machine increases, discharge pressure from the main pump will resist the movement of the pistons. If the pistons are not able to move up the incline of the swashplate toward the port plate, the angle