Hello I have a Cat D4C Series III hystat machine that I am having some issues with. The dozer will not adjust the speed when you press the buttons on the left joystick. I unplugged the joystick at the connector and tested the buttons with an ohm meter. They appear to be working. I do not know enough about the high/low speed system to know how it works and what to test. Could anyone please help me out? Thanks
Check out the attachment. I assumed a 4LS-prefix Serial Number (six other options are available). If that is wrong post the correct S/N and I'll check to make sure that it applies to your specific machine.