New ETX 90 AT too loud?

I just got my new ETX 90AT today. I am not new to astronomy or telescopes.
I just did a play routine to check the functions of the scope, and while
tracking, it is very loud...groaning. I know they are bound to be louder
than the LX series, but I am almost worried something is wrong. When
slewing it hums high and loud, but getting close it groans as if overloaded.
Tracking is loud and groaning. Just how loud are these things? I am taking
it outside soon to check it out and make sure it is even tracking properly.

TIA