A plant for assembling mechanical parts on bodies of motor-vehicles comprises an endless conveying line (1) and a plurality of pallets (P) movable along the conveying line (1), each receiving mechanical parts of the motor-vehicle along a first section (1L) of the line. Means for loading a respective motor-vehicle body (B) on a respective pallet (P) at a loading station (MX), located at the beginning of a second section (1U) of the conveying line (1), downstream of the abovementioned first section (1L) with reference direction of movement of the pallets (P) are provided. At least one bolting station (S) for bolting the mechanical parts on the respective body along the abovementioned second section (1U) is provided. The abovementioned second section (1U) of the line is superimposed to the first section (1L) and aligned therewith, so that the pallets move along a closed loop in a vertical plane, moving along said upper section (1U) in a direction opposite to their direction of movement along said lower section (1L).
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