Question about Chamberlain 3/4-HP Whisper Drive Plus Evercharge Standby Garage Access System

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Trolley went to far up without door wont go back down

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Circuit breaker tripped. Once reset, garages door opened all of the wa. The door only goes down two feet and stopped. When button is pushed again, comes back up hitting the stop quite hard?


Check the travel both up and down without the garage door connected. Check you owners/installation book that came with unit. When you assembled it did you have the trolley in proper place (up against a screw driver. If you don't set trolley and install chain you will have problems with the travel. Sit down and reread instructions and ensure that it assembled correctly.

Jul 02, 2017 | Building Materials

2 Answers

I have a craftsman garage door opener 1999. it goes two feet and then back down. I can open door with one hand. all gears are new as i rebuilt it (Twice).


Your "timing" is off. Disconnect the door from the trolley and tie down the door latch assembly so it does not engage the trolley. Then using the up down button on opener open or stop the trolley at the closest position you can to the motor assembly. Then open the door to the position it would be when open and note where the latch is at that point. Then loosen the drive and move the trolley to the position noted in former step.- then tighten the chain.
Now hook up the door latch to the relocated trolley and play with the up/down adjustments till you get it right.

Jun 11, 2017 | Building Materials

1 Answer

Sears garage door opener model 139.53919


The torsion springs might need adjustment.

Pull emergency release, and manually lift door to half-open position.

When you release the door, it should stay in place.
If it almost "slams" down, the springs are not doing their job to "balance" the weight of the door itself.
The opener isn't designed to overcome the weight of the unsupported (no spring assist) door.

Over time, the springs take a "set", and might need a readjustment
THIS IS A JOB FOR PROFESSIONALS!!!
The springs are under tremendous pressure loading, and can even kill someone if they do not know what they are doing!

Feb 04, 2014 | Building Materials

1 Answer

1/2 horse garage door opener doesn,t open all the way. I need about a foot more lift. The tried a trolley stops before the stop limit..Therre is no interference. I Tried adjusting the up limit to no...


You said you adjusted the up limit already. Is it adjusted as far as possible? Usually the screw will become harder to turn. You mention a new door and spring but is the opener the same? My guess is you have a new opener as well and it is out of sync with the trolley. Try turning the up limit back and see if the trolley will stop shorter. If it does, loosen the chain or belt so that you can remove if from the opener's drive gear. Bring the trolley to your stop limit and put the chain/belt back on the gear. Adjust the chain/gear tension and try door operation again. If it was a sync problem, the door should close closer to your limit. Adjust up and down travel as necessary to fine tune it. This worked for me so good luck.

Sep 18, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chamberlain 4200C doesnt open or close properly


You did not sync the chain correctly. If you have not touched the travel limits, take chain off sprocket and run door to either up or down position. Put chain back on with trolley in up or down, accordingly. Tension and make final travel adjustments.

Mar 07, 2010 | Liftmaster, Chamberlain, Sears Door...

1 Answer

The inner and outer trolley will not reconnect


If the rope is pulled down and back toward the motor unit the trolley latches in the released position. To unlatch the trolley pull straight down on the rope and release. The two halves should now click together.

Feb 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener wont switch from manual to electric again


I think what you mean is you pulled the rope to open and close the door manually and now you can't get the two halves of the trolley to reconnect.
If so, pull straight down on the rope and release. Then run the door so the two halves of the trolley connect. You may have to do that last step manually. If this isn't your problem post back.

Jan 24, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener 1/2 hp will not open door


It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.

Aug 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Garage door went up..but now wont work


It sounds like the trolley (the thing the door is connected to) is jammed against the bolt just in front of the motor unit. Remove the bolt and then run the opener until the door is closed. Now locate the 'up limit' control on the side of the motor unit and turn it about 4 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.

Mar 27, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

3/4hp craftsman will not close the door fully


There are adjustments on the unit itself that control the distance door travels to close as well as the force it uses to close. The info and location of controls is indicated in the manual that came with your unit.

Apr 12, 2017 | Sears Craftsman LiftMaster Chamberlain...

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