||03-03-2013 12:56 PM
Your unit has what's called an R3 High Performance Drive accessory. This became standard equipment is subsequent model years (on 932104,105). Your unit was apparently not equipped as such from the factory and was likely updated by a former owner. It involves a high performance friction disk compound, a different gear ratio from the friction disk shaft to the axle, a smaller pulley (hence different belt) on the front side of the drive plate, and a different shift arm at the back of the frame.
A few things about this: Never use an aftermarket friction disk. If you have, replace it. If it came from an Ariens dealer, that doesn't necessarily mean they used OEM. Many machines are sensitive to non-OEM friction disk rubber compounds. Aftermarket parts are poor for this type of part. The tweaked parts at the back of the frame and the worn out drive plate hex bushing are typically a result of cable over-tensioning. Replace those. Be sure to lubricate the bushing per the service schedule after you get it replaced. Also, the OEM lubricant that is applied between the drive plate and the shaft it attaches to and also the one that lubricates the friction disk hex shaft tends to gum up over time. Clean those up and re-lubricate with a NLGI 1 or 2 grease, preferably synthetic. Also have a look at the drive plate shaft (that rides in the hex bushing) for marks to make sure it isn't damaged or it will toast the next bushing. Shouldn't be, it's heat treated. Also, check the drive axle bushings and lubricate or replace as necessary.
I hope this helps.