I completely removed my overhead drawer last weekend to see if I could improve opening/closing action (a bit too much resistance - some is meant to be there to counteract the weight of contents). Whole job took less than 1 hour with the help of my 11 year-old son - he was up in the roof to undo the 4 hinge nuts (nylocs) under the rearmost mattress piece that support the drawer from above; I'd already removed the two short bolts from the kitchen-side (one in each in the top of the forward and aft cupboards); hardest job was removing the speaker covers in order to disconnect the speaker leads.
The excessive resistance issue was cured instantly by flattening the captive nut plates that hold the drawer sides to the sliding hinge mechanisms - if the short bolts are overtightened, these plates can deform, bend/dish and rub on the hinge sides.
When reinstalling, you have to be very careful not to over-tighten the nylocs in the roof as the corresponding threaded rod (not really a bolt) in the hinge plates is just cast in place - if you over-tighten I can imagine that you can very easily pull these 'bolts' out completely (equivalent to overloading the drawer). I don't know if this is a deliberate design feature (to prevent overloading?) or just bad design. I would suggest that to fix your problem and actually make the drawer capable of supporting greater weight, you can very simply replace the threaded rod (that has 'sheared') with a simple and more substantial, suitably-sized, standard bolt.
Sorry I didn't take any pictures as I did this work that would have made this description infinitely more understandable.