The up force adjustment is not so critical and should be adjusted so that your door opens consistently. The down force is critical because it affects the safety of the unit. It should be adjusted as low as possible.

I answered your other question in your other post.

Hi again Don,

This is great, this is the best support site I have ever had experience with *****

After replacing the drive gear I noticed both the up/down force adjusters were set at 7 or 8 kg (the range is 1-9). Now I have them both at 1kg and it all works like a champ. Even the 2x4 laid flat on the ground triggers an automatic reverse.

Thanks a bunch
Selvan