On 9/28/2015 8:30 AM, Jeff Wisnia wrote:
Don Y wrote:
On 9/28/2015 5:04 AM, DerbyDad03 wrote:
On Sunday, September 27, 2015 at 4:03:06 PM UTC-4, Don Y wrote:

One thing you'll have to watch is the mechanical system tends to be
underdamped. The "impulse" that it experiences when starting can often
lead to the opener triggering a fault and stopping travel ("Oh! I may
have just crushed a little child!"). You can usually compensate for
this
with an "overload" adjustment on the opener.

Temperature can also be a factor. I typically have to increase the up
force
on my older Craftsman GDO when winter arrives. If I don't, it will
start to
open then stop.

Bad rollers (they can be easily replaced), loose hinges and other hardware
also play a roll. It pays to "watch" the mechanism and see how much it
"dances around" -- esp as it tries to get started. If it's moving one way
(due to an undamped oscillation) and opener wants it moving the *other*,
it looks like a jam/overload.

You might say it's too early to be worrying about temperature issues,
but I
just spent the weekend in Western Massachusetts. It was 33° F on Sunday
morning.

I think 102 forecast, here... presently 72 at ~5AM

Thanks, but I installed a new set of nylon/ball bearing track rollers on one of
those doors, oiled the hinges and saw that the door was properly balanced. It
still would intermittently decide to stop on the way up or reverse on the way
down regardless of how I set the "force settings." None of that happened after
I installed the new opener.

The second opener just "dropped dead" and the only faint of some life was that
the LED in its wall mounted push button control was lit.

30 years of use for both of those openers gave me my money's worth, don't you
think?

I wasn't questioning your decision to replace. Rather, was commenting on your
observation:
"It was interesting to note how much lighter the main rail and traveling
components have become over that time, but they look like they'll probably
hold up for the rest of my years."