A soil working device, that is associable with a movable agricultural machine, comprises:- a working implement (2) provided with an operating portion (21) for interacting with the soil and with a connecting portion (22)- a supporting element (3 30) fixable to said movable agricultural machine and arranged for supporting said agricultural implement (2)- a connecting element (4 40) associated with one end (3a 30a) of said supporting element (3 30) and arranged for receiving, and coupling with, said connecting portion (22) of said agricultural working implement (2) in an assembled condition (M)- a locking pin (5 35 45) that is slidably associated with a first seat (6) of said connecting element (4 40) and is movable between a working position (A), wherein the locking pin (5 35 45) engages a second seat (7) of said working implement (2) such as to lock the latter to said connecting element (4 40) in said assembled condition (M), and a disengaged position (B) wherein said locking pin (5 35 45) does not engage said second seat (7) to enable said working implement (2) to be disengaged from said connecting element (4 40)the first seat (6) and the second seat (7) comprise respective through openings and include respectively a first opening (11) and a second opening (12) having dimensions and a shape that are such as to enable opposite ends of the locking pin (5 35 45) to be reached and interacted with, in particular by a dismantling tool (50 51), such as to move the locking pin (5 35 45) between the working position (A) and the disengaged position (B).
