Swoop, thanks for the info. Do you know if the Self Test perfomed at initial startup checks the joystick calibration? Just wondering if operator might have his hand on joystick during the test. As I noted in 1st post no one here has experience with this model Cat and without a repair manual we're working in the dark. I think I'll advise customer to call the local Cat dealer- Wiese, or purchase a repair manual.

Thanks again,
Dino54