Thermo King SB210

Good evening yall!

I just got back into the reefer side of things and bought a 2008 utility reefer from a buddy of mine because it was in good condition and the unit had lower hours on it. He went through some things a few years back which led to him going out of business and this trailer was just sitting for 3 years.

So I did a full PM ( oil change, filters, belts, recharged 3 lbs of freon ) and all seals/valves seem to be good and its holding -10 no problem.

The only problem I have started after I got the belts changed the first time, the tech must've not tightened the tensioner because after a day of running continuous, I heard some weird noises and sure enough the belts were loose and the bolts on the pulley side were more than halfway out. I did my pre-trip that morning as I do every day because I can't afford a claim, everything was good and halfway through my trip this happened. The idler belt was gone pretty much so I changed only that belt and not the fan belt because A it seemed good and B I didn't have a ladder to climb up to the top to take the fan bolts out. Came home after that trip and got both belts changed but this time made sure all bolts were tight. Well, a week later now, my fan belt and idler belt is needing to be replaced again. I have no idea why this is happening. The pulleys spin freely, the tension was less than a half inch, and the tech at thermo king said he doesn't understand which leaves me with no answers. I hope somebody here can help me figure this out. Its a TK SB210