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Posted by dean on October 31, 2006, 11:57 pm
My few-months-old Sears 3/4HP garage door opener, lifts a double door
up nice and smooth. However, when it goes down again, its like the
motor is instantly up to speed and the door knocks its way down for a
few seconds, jolting everything hard.
As far as I know there are two adjusters that determine where the
upmost and downmost points are, but I am not sure if there is any way
to adjust the descent start. Put in a spring between the arm and the
door?
Thanks for any tips!
DeanB
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Posted by Tony Hwang on November 1, 2006, 12:05 am
dean wrote:
> My few-months-old Sears 3/4HP garage door opener, lifts a double door
> up nice and smooth. However, when it goes down again, its like the
> motor is instantly up to speed and the door knocks its way down for a
> few seconds, jolting everything hard.
>
> As far as I know there are two adjusters that determine where the
> upmost and downmost points are, but I am not sure if there is any way
> to adjust the descent start. Put in a spring between the arm and the
> door?
>
> Thanks for any tips!
>
> DeanB
>
Hi,
May be you need an adjustment for the springs?
How does it work(open/close) manually? When properly adjusted
it should not need much effort to open or close.
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Posted by Richard J Kinch on November 1, 2006, 4:52 am
dean writes:
> Put in a spring between the arm and the door?
Too much spring already. You need a damper.
The opener just has the wrong characteristic, I assume because they use a
cheap AC motor that has no low-torque capabilities.
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Posted by Joseph Meehan on November 1, 2006, 7:46 am
As Tony suggested, start by making sure the main springs are correctly
adjusted and the tracks are also ok. Disconnect the door from the opener
and make sure it moves easily up and down and will stay up and stay down
without help.
If that does not do it, then I would guess some sort of dampened would
be called for, but I don't know what to suggest, I have never seen one for a
garage door. A spring would likely be a problem not a cure.
--
Joseph E. Meehan
26 + 6 = 1 It's Irish Math
> My few-months-old Sears 3/4HP garage door opener, lifts a double door
> up nice and smooth. However, when it goes down again, its like the
> motor is instantly up to speed and the door knocks its way down for a
> few seconds, jolting everything hard.
>
> As far as I know there are two adjusters that determine where the
> upmost and downmost points are, but I am not sure if there is any way
> to adjust the descent start. Put in a spring between the arm and the
> door?
>
> Thanks for any tips!
>
> DeanB
>
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Posted by RayV on November 1, 2006, 8:12 am
dean wrote:
> My few-months-old Sears 3/4HP garage door opener, lifts a double door
> up nice and smooth. However, when it goes down again, its like the
> motor is instantly up to speed and the door knocks its way down for a
> few seconds, jolting everything hard.
>
> As far as I know there are two adjusters that determine where the
> upmost and downmost points are, but I am not sure if there is any way
> to adjust the descent start. Put in a spring between the arm and the
> door?
>
> Thanks for any tips!
>
> DeanB
Your spring(s) need to be adjusted. The door is binding because of
unequal tension.
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