Mower unit and work machine including mower unit

A mower unit mountable on a travel body,

• the mower unit comprising:
• a mower deck open downward;
• a rotary blade disposed inside the mower deck and rotatable about a vertical axis;
• a rotor disposed outside the mower deck and configured to transmit a rotation motive power to the rotary blade;
• a cover unit covering the rotor;
• and
• mounting mechanisms detachably mounting the cover unit on the mower deck,
• the mounting mechanisms including:
• a tool-based mounting mechanism involving a tool to detach the cover unit;
• and
• a tool-free mounting mechanism involving no tool to detach the cover unit,
• wherein the cover unit includes:
• a first cover including a tool-based mounting portion as a mounting portion for the tool-based mounting mechanism;
• and
• at least one second cover including a tool-free mounting portion as a mounting portion for the tool-free mounting mechanism and including no tool-based mounting portion, and
• wherein with the at least one second cover mounted on the mower deck with use of the tool-free mounting mechanism, mounting the first cover onto the mower deck with use of the tool-based mounting mechanism prevents the at least one second cover from being removed from the mower deck, and removing the first cover from the mower deck allows the at least one second cover to be removed from the mower deck.