Abstract: A lockable lift assembly for controlling the height of a mower cutting deck is provided. The assembly includes a pedal actuated system including a rockshaft extending the width of the mower frame and having plates on which the deck is carried as a change in height is either performed or maintained. Intermediate these extensions is a toothed plate which cooperates with a handle operated latching system to permit a user to fixedly control the height of the cutting deck. Joint use of the pedal and latching system enables placement of the deck in a position wherein the deck is raised above the highest heighth of cut for travel across the ground or, alternatively, in a removal position in which the deck may be securely and quickly detached from the mower.