Arien's EZR 1648 cut looks terrible, striping

I am the original owner of my EZR1648 mower. In the last few years the cut has been getting worse and worse. I have replace belts (OEM), blades(OEM and Gator), springs, and bearings trying to get it to mow like it did when it was new. Nothing seems to help. It still leaves stripes in the yard where it isnt cutting.



My question here is, Is it possible there is a bad/wore sheave that is allowing the belts to slip? If so, how do I tell? I hate to start replacing sheaves when the cheapest one from jackssmallengines.com is $90. And this is the one for the 2 outside blades.



Mower Info



EZR 1648

model #915009

Serial #001211



I purchased it new 5-15-1999 for $3558.31.



Thanks for the help



Bill