A track vehicle , comprising: a track frame ; a driving wheel carried by said track frame and configured to rotate; a track rotatably engaged with said driving wheel ; at least one idler wheel engaged with said track ; a tensioner coupled to said at least one idler wheel and configured to force said at least one idler wheel into engagement with said track ; and a recoiler coupled to said tensioner ; a fluid damper attached to said track frame and coupled to said tensioner and said recoiler , said fluid damper comprising: a fluid chamber having a first port and a second port ; a piston coupled to said tensioner and/or said recoiler within said fluid chamber ; and a restriction circuit fluidly connected to said first port and said second port and configured to form a closed fluid circuit, said restriction circuit configured to permit a substantially unrestricted fluid flow through said closed fluid circuit when said piston moves in a first direction and a restricted fluid flow through said closed fluid circuit when said piston moves in a second direction opposite to said first direction ; wherein said restriction circuit includes a check valve and a restriction orifice . and said check valve and said restriction orifice are arranged in parallel characterized in that said restriction orifice is an adjustable size opening. a track frame ; a driving wheel carried by said track frame and configured to rotate; a track rotatably engaged with said driving wheel ; at least one idler wheel engaged with said track ; a tensioner coupled to said at least one idler wheel and configured to force said at least one idler wheel into engagement with said track ; and a recoiler coupled to said tensioner ; a fluid damper attached to said track frame and coupled to said tensioner and said recoiler , said fluid damper comprising: a fluid chamber having a first port and a second port ; a piston coupled to said tensioner and/or said recoiler within said fluid chamber ; and a restriction circuit fluidly connected to said first port and said second port and configured to form a closed fluid circuit, said restriction circuit configured to permit a substantially unrestricted fluid flow through said closed fluid circuit when said piston moves in a first direction and a restricted fluid flow through said closed fluid circuit when said piston moves in a second direction opposite to said first direction ; a fluid chamber having a first port and a second port ; a piston coupled to said tensioner and/or said recoiler within said fluid chamber ; and a restriction circuit fluidly connected to said first port and said second port and configured to form a closed fluid circuit, said restriction circuit configured to permit a substantially unrestricted fluid flow through said closed fluid circuit when said piston moves in a first direction and a restricted fluid flow through said closed fluid circuit when said piston moves in a second direction opposite to said first direction ; wherein said restriction circuit includes a check valve and a restriction orifice . and said check valve and said restriction orifice are arranged in parallel characterized in that said restriction orifice is an adjustable size opening. <EOS>