So, the sprinkler system of my newly bought City doesn't work.

The problem seems to be in the activation level (PULL). When I pull it, it moves a bit outwards but when I released it, it doesn't go back but stays there. Also, I don't hear any motor work which means this pull knob thingy isn't working.

Can this be fixed or will the whole left side need to be replaced? If so, how much does it cost?