Not much there to see so any wear problem ought to be evident. Besides being loose - you' d better make sure the alignment is correct. If not, they will keep walking off.
My 310G was losing tracks quite a bit until I put new rollers on it (all the bottom rollers were junk). I also had to put in new adjusters. Mine has the mechanical adjusters which are available new and fairly cheap.
The new rollers from Korea were also surprisingly cheap. About $80 each delivered to my door on a pallet.