We have a Stanley quiet-glide garage door opener and it opens a little and stops and then returns, sometimes, to the original spot or just goes about a foot and stops.

SOURCE: Craftsman garage door opener won't open on first try

MIGHT NEED A NEW BATTERY IN THE REMOTE

SOURCE: Garage door opens about one foot and remains there.

Check the door springs. You could have a broken spring. Also remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. It is possibly stripped. This is a good time to release the door from the opener and operate it by hand to see just how heavy it has become.

SOURCE: Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: garage door opener only runs for a foot or two and...

Check to make sure you don't have a broken door spring and also remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and may be stripped.

SOURCE: I have a Genie garage

There are codes on the back of the opener unit. One set is for going up and one set is for going down. Both sets on the back of the unit must match your opener or the frequencies will not open and close your door.

SOURCE: chain flies off of Stanley

Stanley Vemco, Quiet Glide, LightMaker, Home Innovative, Whistler, Popular Mechanics, and SecureCode were all manufactured by Stanley Works and parts are interchangeable. Replacement remote transmitters, receivers, keypads, some circuit boards and other parts are available at our store.For Stanley gate opener and garage door opener parts and accessories go to Stanley Garage Door Opener Parts
Instructions, schematics, wiring diagrams, adjustments, and additional help with problems and repairs for stanley garage door opener can be found in the owner's manuals.
The following are manuals I have found on other websites. I do not guarantee their accuracy or continued availability.
Available manuals from Marwest Access Controls, Inc.: Chain, Screw and Cable (for Stanley garage door openers from 1982 to Current.) $7.50 each
Stanley Code Key Instructions - (dual-technology)
Stanley Code Key Instructions - (non-secure code)
Stanley 1050, 1094, 1082 coding instructions
Stanley Lightmaker & SecureCode Transmitters coding instructions
From Stanley Garage Door Openers back to Brands page

The Stanley Garage Door Opener has not been manufactured since 1997. Parts can be difficult to find. You probably cannot find parts locally, but some are still available online.Stanley Garage Door Opener Parts