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How do I change the door cycle?

I replaced gears. Assembled and now with or without chain on, it only cycles about two feet up and down.It's a Craftsman. The stops are not engaging during the cycle either.
Edmond Rosky, May 2009
Garage doors are usually 6ft/ high. So a cycle of 2 ft is insufficient to raise the door fully up or down/

Edmond Rosky, May 2009
Give up Edmond - you've defeated me.

It has a door and gears and a chain and goes up and down.

Just what is it?

Peccavi, May 2009