The jack shaft of my door is 2 3/4" from the ceiling (measured to the center of the shaft) Will this opener connect directly to the jack shaft, or will I have to adapt it with sprockets and a drive chain?
1834945
a google search reveals that you need 3" clearance. There is a product that might help you http://www.northshorecommercialdoor.com/limo48rjo38a.html
1591163
No sure what your asking. I have a Chamberlain Whisper Belt drive opener. I consider it an overhead model and it works fine.
566784
What I have done in the past, was go to Home Depot, buy about 8 inches of chain. Run one end thru the Jack, the other end around the roll bar, take a pad lock, lock the ends together. But don't do what I did, which was to buy the chain, without making sure it would go thru the Jack! Back I went, lol
69082
I have a regular 4" drop shank and I am able to open my tailgate. I have about 1/4" left before it touches the tongue jack.
488416
Unknown...However, it should work. In my own house I have 9 foot doors and I used Craftsman (Sears) openers in 2006 with extensions. Basically identical items. If the door is heavy or double I suggest using 3/4HP version, that I also have used recently for a rental property.
365292
It works well with my Craftsman 3/4hp chain driven opener. I really like the one-button close feature. Haven't yet tried the temporary combination functions.
2277264
Do a google search of "Liftmaster 8500 manual" and look at page 3 for all the pre-installation requirements. I found this link: http://www.liftmaster.com/CatalogResourcesV3/en-us/shared/files/tucmanuals/114A4565.pdf On that page it gives this answer: The torsion bar must extend at least 1-5 inches (2.5-12 cm) past the bearing plate. This may vary depending on your installation requirements.
2234557
The only problem I see that when you add extension you may have to support the rail in the middle otherwise it may sag or deflect in the middle that may cause the chain sag too. Make sure when you add support it has to be attached on the top of the rail to clear the chain interference. This is 3/4hp opener will do the job. Good luck.ss
2163072
I am trying to find that out as well. When you get the answer, please post something. I purchased this item and it is not compatible to my Liftmaster garage door system. Go figure!
514013
Ours is attached at the door header and again at 112inches along the rail and continues back another 12 inches. So if you are expecting to fit the total opener system (motor and rail) in a 119inch space it won't fit. But its a great opener. Ours is suspended by brackets maybe you could do the same. Would take picture of ours but no way to send it to you. You can email me at sokolic@yahoo.com if you want a picture.
1004656
If you have a liftmaster or chamberlain with the plastic gear drive take a look at it and see if it is stripped. Sometimes when the chain is tightened it puts too much pressure on the big gear and concaves it. Thus the door might start but the gear would slip and not go all the way up. The other thing to check is the up power adjustment.
1826430
Cable lift has the springs raped around the jack shaft and standard style has the conventional pair of long springs hanging on the upper track to pull the door up. The Lift Master pulls the door up from the jack shaft with the assist of the spring. In other words if you have big long springs hanging from the end of both upper tracks the Lift Master won't work for you. Hope this helps Leon
1795108
I'm sure it will replace the Liftmaster. This is a basic model opener with fewer bells and whistles but works well and is easy to install if one has some basic handy man skills. It does have a more powerful motor than the 1/3 hp model you have. I wouldn't try to use any old parts, except for wire that might already be installed in your garage.
375529
Maybe 1/2 - 3/4 inches. You can adjust the door opener to compensate for any difference in clearance issues. Adjustment is made at the motor part of the opener.
1663752
This has been a little time since I installed the motor, but I will offer this: the shaft is 1/2" in diameter, and is about 3" long. There's a flat on the shaft full length, for the set screw on the fan blades to clamp on. The motor housing is around 5" in diameter. This motor seems to fit pretty much all of the power roof vents...however, you might have to take the mounting bolts out and install them from the opposite direction for some installations. This is a super easy conversion. I would suggest applying a light coat of grease to the shaft before assembly, to preclude rust from forming, so the job will be easier next time! Lastly, this motor CAN be replaced from indoors, if attic access is practical; however it requires a bit of patience to get everything in place around the four motor mounting brackets. Nice if you have a high and sharply pitched roof!
443800
Yes, the distance will be controlled on the opener. You just need the extension.
1247465
I would call them direct to confirm. I think it depends on how old your opener is. Sorry I could not be more help.