Garage door reverses after closing
I recently replaced my drive gear which was worn out. I now have a problem where the garage door reverses immediately after closing. The led on the garage door opener does not blink. I have tried:
1. Decreasing the down travel (couple of 360 degree turns clockwise but it didnt help)
2. Decreasing the down force (about 20 degree turn anticlockwise. The force adjustment is pointed to about 4 o'clock.) I didnt try increasing it lest I wear out my drive gear.
I also tried to grasp the door while it was travelling downward but it continues to move down. It doesnt stop. There is no problem when it is travelling up.
Could this be because of a balancing issue or just an adjustments problem.
Thanks in advance for any tips.