VALVE-CHECK 4704242 - Caterpillar

Right Turn (Pivot Turn)
The operation of the right turn (pivot turn) is similar to the operation of the left turn (pivot turn).Left Turn (Counterrotate Turn)
Illustration 4 g03708145
Forward, Left Counterrotate
(1) Joystick
(2) Electronic Control Module (ECM)
(3) Left track pump controller
(4) Right track pump controller
(5) Piston pump
(6) Left actuator piston
(7) Left track forward pressure sensor
(8) Right track forward pressure sensor
(9) Left track reverse pressure sensor
(10) Right track reverse pressure sensor
(11) Right track piston motor
(12) Left track piston motor
(13) Right actuator piston
(14) Right track piston pump
(15) Left track piston pump
(16) Right track motor servo valve
(17) Left track motor servo valve Joystick (1) sends the direction request with a pulse width modulated signal. Also, joystick (1) sends the steering request with a pulse width modulated signal to ECM (2). ECM (2) interprets the two signals and ECM (2) determines that joystick (1) is in the FORWARD position and in the COUNTER ROTATE LEFT position. As a result, ECM (2) sends the following signals to the piston pumps and to the piston motors.ECM (2) sends a pulse width modulated signal to the forward solenoid of right track pump controller (4) of piston pump (5). The duty cycle of the signal increases proportionally to a request to move the track faster. A higher duty cycle will further energize a solenoid. As a result of the signals to the solenoids of piston pump (5), right track pump controller (4) shifts to the left. Pilot oil flows through right track pump controller (4) into the chamber of right actuator piston (13). The oil overcomes the force of the