125 with 42" mower deck
 

My mower drive belt keeps popping off. I am not sure why I was thinking it was maybe the idle pulley bearing are no good but not sure where to get new ones. I did replace the mower deck bearing already. Anyone have any ideas ?

Thank you
Dtyler07

First, welcome to OCC..........:Welcome2:

You can obtain the pulleys you want at our sponsors at the Top of the Page.
CC Specialties for new ones, and Houtz or Patton for good used ones.

:IH Trusted Hand:

I have no idea if this is relevant for you, but I had problems with the 42" deck on my 123. Same thing, it wouldn't keep the belt on.

I even tried a new belt, and therein was my problem. The new belt, that was supposed to be an exact replacement, was a 1/2" wide belt. The original is a 3/8 belt. When I put a 3/8 wide belt on it, all the problems went away.

Thank you I will take a look.

Hi, Thank you. I will take a look at my belt sizes.