Garage door openers in sears catalogs More details in description

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=dqUCMO5g4CU

And if thy right hand offend thee, cut it off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell. - Matthew 5:30 • Rather than do a video on a specific operator this week, I do a somewhat detailed overview of the various models offered in 1968, 1974, 1981, and 1992 sears catalogs. There were more models available in store for these specific years (and just in general across all years that Sears sold operators) than what was shown here. I tried to keep the video length to a minimum and added a lot of additional information here: • In the 1950’s Homart sold operators to sears which I believe was a division of Perma Power at the time. I'm also led to believe based on what I've read that Perma Power changed their name in the very late 60's to LiftMaster. The prefix for those 1950's operators was 664.65xxx which might explain why there is a “64” before the listed model number. The 1968 sears best and the two lower end openers in the 1974 catalog used a control board to control some of the openers functions. On the ‘68 sears best a thermal light delay was used separately from the control board to control the light, chain dogs were used to set the limits and an all metal gear reduction was used (possibly 12:1 on the gear reduction). On the two lower end models shown in the ‘74 catalog (and other similar models offered in store), they used chain dogs to set the limits and control the opener light, these models use a more complex all metal gear reduction. All other 70’s V-belt operators used a magnetic relay to open and close the door, a thermal light delay to control the light, and have internal limits (no chain dogs). I believe there were V-belt driven machines that were offered through the 60’s, however at this time I don’t have any information on them. At one point I remember seeing (and having) a list of obsolete operators from LiftMaster that did mention those units, but I haven’t recently been able to locate that document on their site and it got deleted from my computer when the hard drive failed. Starting in early 80’s (possibly around 1979 at the earliest) chamberlain decided to have a more standardized build platform and used using the same components in all machines, the 139.664300 is the only exception. This was also the time period where they introduced their first 1/2HP operator, along with new screw drive models. All models offered were fully automatic and used internal limits that are easily adjusted with a flat head screw driver without removing the case again the 139.664300 being the only exception. Logic boards controlled all functions of the operator from this point forward. This was the last generation of machines from chamberlain to have the radio receiver be separate from the main logic board, and the only generation to use a smaller metal and nylon 12:1 gear reduction, the 139.664300 being the only remaining V-belt reduced machine offered. This was the first generation to receive a mid-cycle update and begin the use of the RPM sensor (the 139.664300 was not capable of this and never had one) starting some time in 1982 at the time this feature was introduced, the safety sensors became an option. Logic boards are not interchangeable between the two different versions of these machines (example a logic board from a 139.664100 is not compatible with a 139.664053 and vise-versa). Note: the 139.664953 and 139.664300 were not shown in the 81 catalog, though they were offered during that same time period, and the 139.66498x 1/2HP economy machines were not available for sale until 1982/1983. Starting somewhere around 1984/1985 the silver series operators were produced which was the first to use a 16:1 gear reduction. All operators from this point forward (with the exception of DC motor operators starting in the early 2000's) use the same build platform through today only having made modular upgrades over the years/decades to keep the units up to date. Unfortunately these current operators are lacking a bit in the quality department and likely only have a life of about 8-12 years, where as older models (80's and 90's) lasted anywhere from 20-30 years and anything pre-1980 is virtually indestructible and will easily last 50+ years with little to no maintenance. Parts for all models made before 1993 were discontinued in 2008 and are no longer available directly from chamberlain. • If anybody out there has additional information to what I have, or you see a correction that needs made to the video description let me know so I can update it!!! As time progresses and i acquire more information, I will update this description • need an owners manual? check out my website! • https://garagedoorguy89.weebly.com/

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