Recently purchased this Cat 289c from auction. Everything was working great until today. Machine was operating fine then randomly the right joystick for arm/bucket function stopped. Made sure the door was shut tight. I have no way to check for active fault codes but I have no lights on indicating a fault either. Any help in the right direction would be great.
Do you have a DMM (multimeter) capable of measuring duty cycle.? If you do then post a Serial Number. That gets you the correct electrical wiring schematic. Using both the above you can test the output of the PWM sensors in the RH joystick base to see if they are performing correctly.