Servo humming

As expected that's exactly what the problem is, the servo is constantly under load because it cannot fully pivot. There's not any room for adjustment because the linkage rod bottoms out on the dump body. Is there any way to set the travel rotation of the servo within the radio programming? ( I have no experience in programming) I noticed the lift axle is whining a little bit to, it is switched to the left battle switch. Any good links for programming threads or how to's? Much appreciated gents!