Replace rear bearing of Dewalt DWS520 Type 1 track saw
I looked at an exploded view of that saw, and there are bearings listed as replacement parts (part No's 66 and 68), which is usually the tell-tale sign that they are replaceable. That may however be difficult if you don't have the right tools and skill sets, such as a bearing puller and a press to re-install them. I would call DeWalt.