[Andy A.]

Could you describe your control system? While I agree that a mechanical problem is the most likely cause, I wouldn't discount the possibility of a problem with the joystick(s) or even one of the victors.

Have you calibrated the victors? Are the victors all running? Are you sure that your programming is legit? It's possible that one motor isn't being powered at all. It's actually a very easy thing to have happen, and you probably wouldn't notice with no load on the system. All it takes is one of the breakers to come loose or a PWM cable to not be fully seated or any number of other things.

Just one more thing to check on. As long as all the victors are lighting up green when you have the stick down, then it's probably not a control system problem.

-Andy A.