Thanks for the reply. I have a 2004 Cub Cadet Model 2518 riding mower.
This is a pic of the tractor & PTO I got online:
It has a PTO with a electric control.
Thanks again for reply.
I get this whining sound almost gear like when I engage the mower deck or snow thrower. I turn off the PTO and the engine sounds fine. Is it the PTO or another kind of problem?