The mechanical arm system can include a garbage container holder and at least one mast. The holder can have guiding wheels engaged with adjacent tracks of the mast, the two adjacent tracks both having a lower portion extending upwardly along the mast, the lower portion of the first track being located forwardly of the lower portion of the second track, the lower portion of both tracks leading into corresponding upper portions which are curved rearwardly. The system can have a primary mast and a secondary mast slidably mounted to the primary mast, with the garbage container slidable mounted to the secondary mast. A driving link can simultaneously connect the primary mast to the secondary mast, and the secondary mast to the holder in a manner that when the driving link is moved, both sliding movements are performed in the same direction.