A raising and lowering mechanism for a mower deck of a lawn mower including a front hanger and a rear hanger the front hanger and the rear hanger each are, independently, a four link frame, with a front end of the front hanger and a front end of the rear hanger being hinged, independently, to the frame of the lawn mower, and a lower portion of a rear end of the front hanger and a lower portion of a rear end of the rear hanger being hinged, independently, to a top portion of the mower deck a first link is hinged to a middle portion of a rear link of the four link frame of the rear hanger, and an upper end of the first link is linked to an lower end of a bridging swing arm, with a middle portion of the bridging swing arm being hinged to the frame of the lawn mower via a spindle an upper end of the bridging swing arm is hinged to a rear end of a second link, and a front end of the second link is hinged to an upper end of a swing arm, with an lower end of the swing arm being connected to a rotatable axle and able to rotate with respect to the rotatable axle one end of the rotatable axle is connected with a driving lever, with an upper end of the driving lever being in screw connection with a fine adjustment screw an end of the fine adjustment screw opposite a head thereof extends rearward and against a middle portion of the swing arm the other end of the rotatable axle is connected with a handle which can be operated to drive the rotatable axle to rotate. The height of the mower deck can be adjusted quickly and conveniently as required by using this mechanism and the mower deck can be suspended stably from the lawn mower frame.
