A 10 to 15 year old Honda Harmony II HRT 216 has lost power propelling itself. It is belt driven(belt is fine). I opened the gear box but I can't tell if anything is wrong.
Owners manual shows nothing about propelling it. Great machine if it would propel itself again. Help

The tensioner pulley is on a swing arm that applies tension to the drive belt, it is adjustable and needs tightening. Belts stretch with age, like me.

The tensioner pulley is on a swing arm that applies tension to the drive belt, it is adjustable and needs tightening. Belts stretch with age, like me.

I agree ,there is also a adjusting nut at the top of the cable you can tighten that also