A mower deck suspended stably from a lawn mower frame by a four link frame of a front hanger and four link frame of a rear hanger. The height of the mower is adjusted when a handle is pushed forward to rotate a rotatable axle in a clockwise direction, which causes a driving lever to rotate in a clockwise direction. A fine adjustment screw pushes a swing arm to rotate rearward, which forces a bridging swing arm to rotate in a clockwise direction via a second link. The bridging swing arm forces the first link to swing upward which forces the rear end of the rear hanger to swing upward, thereby raising the mower deck. When the handle is pulled rearward, the mower deck will be lowered.
