CYLINDER GP-BOOM 3119531 - Caterpillar

Flow Control Under No Load
Illustration 1 g01479232
Regulation of pump flow (no-load condition) (1) Pin (2) Springs (3) Control valve (4) Passage (5) Piston (6) Spring (7) Passage (8) Piston (9) Passage (10) Spring (11) Piston (12) Pin (13) Swashplate (14) Spring (15) Signal for flow controlWhen the joysticks and/or the travel levers/pedals are in the NEUTRAL position or when the joysticks and/or the travel levers/pedals are partially moved from the NEUTRAL position, orifices in the main control valve control the signal for flow control pressure. Control valve (3) , piston (5) and piston (11) control the output flow of the main pump.When all of the hydraulic controls are in the NEUTRAL position, the main pump destrokes in the following manner.The signal for flow control pressure acts on control valve (3) through passage (4) . Piston (3) shifts against springs (14) and (2) by the higher pressure.The pressures of the chambers for piston (5) act on the right end of piston (8) . Piston (8) shifts to the left, which pushes piston (11) to the right. Because of the mechanical linkage with pin (12) , swashplate (13) is rotated against spring pressure (10)