Okay, that is an older Honda HRA215 mower. Nice unit!
From what I can see, it is a shaft-drive model, so no belt(s).
There were a couple of service bulletins issued for this model (over 20 years ago!):
#24, Broken Clutch Fork
#50, Excessive Wear on Driven Clutch
Now my data only shows what USA models were affected, so I can't say for sure if your Canadian-market model was in the group(s) or not. I've attached copies to the bulletins as an FYI.
There's no specific troubleshooting in the shop manual, but I've included a few disassemble and inspection pages to get you familiar with the parts a bit more. It's a simple system, and if you elect to try repairs yourself, keep the work area spotless clean and take your time to really inspect all the parts. With a mower over 20+ year old, no telling what might be worn out. Most individual parts are still available, but not all, so keep that in mind. You can still buy a fully-assembled transmission; it's Honda Part Number 20001-VA4-J02, (that is a USA-system part number) with a list price of $219.91.