A threshing system for threshing a crop material, comprising: a rotor; a housing surrounding at least a portion of the rotor and including at least one concave located at a distance radially away from the rotor and having a concave frame which is configured for receiving a concave insert; and a concave adjustment and suspension device connected to the housing and configured for adjusting a position of the concave frame and relieving an impact force acting on said at least one concave, said concave adjustment and suspension device including: a torsion bar having a main section and at least one additional section being rotatably connected to the main section and operably coupled to the concave frame; a drive operably coupled to the main section of the torsion bar and configured for rotating the torsion bar to adjust the position of the concave frame; characterized in that the threshing system further comprises at least one pneumatic spring mounted to the torsion bar and configured for compressing to relieve the impact force acting on said at least one concave, wherein: • said at least one pneumatic spring is interconnected between the main section and said at least one additional section, • said at least one additional section is independently rotatable from the main section, and said at least one pneumatic spring is further configured for translating a rotation of the main section to rotate said at least one additional section in order to adjust the position of the concave frame, • said concave adjustment and suspension device further includes a first mounting bracket interconnected between said main section and a top of said at least one pneumatic spring and a second mounting bracket interconnected between said at least one additional section and a bottom of said at least one pneumatic spring. a housing surrounding at least a portion of the rotor and including at least one concave located at a distance radially away from the rotor and having a concave frame which is configured for receiving a concave insert; and a concave adjustment and suspension device connected to the housing and configured for adjusting a position of the concave frame and relieving an impact force acting on said at least one concave, said concave adjustment and suspension device including: a torsion bar having a main section and at least one additional section being rotatably connected to the main section and operably coupled to the concave frame; a drive operably coupled to the main section of the torsion bar and configured for rotating the torsion bar to adjust the position of the concave frame; a torsion bar having a main section and at least one additional section being rotatably connected to the main section and operably coupled to the concave frame; a drive operably coupled to the main section of the torsion bar and configured for rotating the torsion bar to adjust the position of the concave frame; characterized in that the threshing system further comprises at least one pneumatic spring mounted to the torsion bar and configured for compressing to relieve the impact force acting on said at least one concave, wherein: • said at least one pneumatic spring is interconnected between the main section and said at least one additional section, • said at least one additional section is independently rotatable from the main section, and said at least one pneumatic spring is further configured for translating a rotation of the main section to rotate said at least one additional section in order to adjust the position of the concave frame, • said concave adjustment and suspension device further includes a first mounting bracket interconnected between said main section and a top of said at least one pneumatic spring and a second mounting bracket interconnected between said at least one additional section and a bottom of said at least one pneumatic spring. • said at least one pneumatic spring is interconnected between the main section and said at least one additional section, • said at least one additional section is independently rotatable from the main section, and said at least one pneumatic spring is further configured for translating a rotation of the main section to rotate said at least one additional section in order to adjust the position of the concave frame, • said concave adjustment and suspension device further includes a first mounting bracket interconnected between said main section and a top of said at least one pneumatic spring and a second mounting bracket interconnected between said at least one additional section and a bottom of said at least one pneumatic spring.