What does the crank arm adjust regarding door travel?

The crank arm is a crucial component in regulating how the door operates, specifically affecting the travel length of the door. When you adjust the crank arm, you are essentially altering the distance that the door travels when it opens or closes. This adjustment allows technicians to set the door's travel to the correct position, ensuring it aligns properly with the elevator cab when fully open or closed.

Understanding this adjustment is vital for maintaining the appropriate functioning of the elevator doors, as it impacts the overall efficiency and safety of the system. Proper door travel ensures that the doors can open and close without obstruction and facilitates a smooth transition for passengers entering and exiting the cab.