Hi how old is the unit? Has it ever been lubricated?
Ah OK if it's a unit from a gym it does not get lube. If it's that old your belts and deck are worn out for sure. Being that old and from a gym it's not going to be Cheap to fix. Most likely not cost effective.
You can look up Parts at fitnessrepairparts. Com or Treadmill doctor. Com
Belt and deck need to be replaced at the same time. They wear together. How does the Motor sound ? Is it very loud? That's Cheap for a commercial unit so that would def be worth it. Usually they are much more $
That's a great deal. The only other 2 things are Motor and controller. But the units works fine until under load. So that means too much friction.
Well it was blowing fuses due to bad belt and deck. Too much draw from the Motor trying to keep the correct speed. The clicking is the bearings wearing out on the Motor.
You can have it rebuilt or replace the Motor. Check prices on both. As long as it's not too loud just run it
Rebuild usually cheaper. Try an alternator Repair shop
please rate my answer. thanks!