STEP AS 2125006 - Caterpillar

Illustration 1 g00666456
Joystick with ejector control
The ejector of the Wheel Tractor-Scraper is controlled by the left and right movement of the joystick. The joystick sends a 500 Hz PWM signal to the ECM at connector contact J1-14. When the operator moves the joystick to the left (1, 2), the ejector will move forward. The ECM sends a signal to the Ejector Forward Solenoid through connector contact J2-51. When the operator moves the joystick to the right (3, 4), the ejector will return to the rearward position. The ECM sends a signal to the Ejector Reverse Solenoid through connector contact J2-61.When the joystick is in the full ejector reverse position, the ECM will put the ejector in the automatic return mode. In automatic return mode, the ECM sends a minimal command to the ejector forward solenoid and the ECM sends a maximum command to the ejector reverse solenoid. The lamp (ejector return) will illuminate. The signal for illuminating the lamp is sent through connector contact J2-15. These commands remain active until one of the following events:
A diagnostic code for the ejector is detected.
The joystick is moved into the forward position.
The ejector cylinder pressure switch signifies high pressure. This normally closed switch opens removing the signal to connector contact J1-17.
The ejector has been in return mode for more than 20 seconds.