On 10 Feb 2007 16:31:31 -0800, wrote:

I have a 4-5 year old Sears 1/2 hp garage door opener. It had been
working fine, but a few days ago it malfunctioned. When I press the
control to open it, I can hear the motor running, but the gear that
drives the chain doesn't turn. Any suggestions on how to fix it?

Take the cover off and look at it. The white plastic worm gear is
probably worn out. It is replaceable