TURBOCHARGER GROUP 6N7116 - Caterpillar

Small Displacement Change Operation
Illustration 1 g02571576
Travel motor (partial diagram)
(1) Swashplate
(2) Piston
(3) Piston chamber
(4) Passage
(5) Displacement change valve
(6) Port (pilot system oil pressure)
(7) Port (supply oil or return oil)
(8) Check valve
(9) Check valve
(10) Port (supply oil or return oil)
(11) Passage
(12) Piston chamber
(13) Piston
Illustration 2 g02571578
Small displacement change operation
(1) Swashplate
(2) Piston
(3) Piston chamber
(4) Passage (return oil)
(5) Displacement change valve
(6) Port (pilot system oil pressure)
(7) Port (supply oil or return oil)
(8) Check valve
(9) Check valve
(10) Port (supply oil or return oil)
(11) Passage (pump delivery flow)
(12) Piston chamber
(13) Piston
(14) Spool
(15) Spring
(16) Body
(17) Spool chamber
(18) Spool chamber
(19) Passage (return oil)
(20) Hydraulic tank When the travel speed control switch on the control panel is pushed, a rabbit appears on the display. The machine is in HIGH SPEED MODE. In this condition, an input signal from the travel speed control switch is sent to the machine ECM.The pressure sensor for the pump delivery also provides an input signal to the machine ECM. When the travel load is light and the pump delivery pressure is below a certain level, the signal from the pump delivery pressure sensor is below a certain level. When the pump delivery pressure is below a certain level, the machine ECM energizes the travel speed solenoid. When the travel speed solenoid is energized, pilot system oil flows into pilot port (6) of