How does the pull down motor know when to stop pulling down? Is it possible that it can pull hard enough to break the hatch glass? How would one adjust if its pulling down too far?

 

There is a switch at the bottom of the motion, when the motor gets low enough the switch is thrown and the motor stops.

You want it to pull down and turn off, not pull down, struggle a ton, then turn off. If its struggling, then adjust it upwards there are screws on each side of the assembly that mount it to the car.

 

Thanks Steve! Mine is not shutting off right away but doing exactly what you described. I'll try adjusting it. Thanks so much for the help.