sid wrote:
On Jul 17, 7:25 am, Hipupchuck wrote:
sid wrote:
Our Garage Door opener Jerks when it opens and closes. Its like the
opener does not make an effort to open easily or slowly, its like it
just dropped the clutch. does not matter if its up and closing or
closed and starting to open !
Are there any openers on the market that stated the movement slowly ?
Thanks
Sounds like the spring that ties the two ends of the chain together is
weak or loose. There is no clutch. Unless your track is binding the door
it's entire length. A heave drag will make it bounce in both directions.

Its a LiftMaster Chamberlin Professional, Formula II
It uses a belt with teeth.

The system has been up 5 years and has been jerking since the day it
was intalled.
I questioned the builder on it, but he stated that there was nothing
that he could do.

Its not a question of spring tension or lubrication, its just a fact
that the panels of the door have some natural play between them and
when the opener starts to move, its with an abrupt manner. The whole
door (all the panels) bounce back and forth for about a 2 count,
before it settles down and travels the rest of the distance.

One would think that a designer would design the opener to start out
slowly and then get up to speed. Not just close a contact and engage
the motor like dropping a clutch (I know there is no clutch, just
trying to draw a picture).

Any ideas, Thanks
Hi,
Checked belt tension? Or loose sprocket/pulley on thw ahaft?
Ours is screw drive and there is an adjustment for that.
S\Yet, better consult the manual.