Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Motor sounds like it is running but sprocket doesnt move

I have the 1/2 HORSE POWER CHAIN DRIVE opener, the motor sounds like it's running, but the chain is not moving.

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  • 244 Answers

How old is unit. sounds like gears are shot, takes $25 of parts and 2-3 hours to fix if you are handy. Take cover off, If it has white powder (Not ****), gears are shot.

Posted on Jan 15, 2009

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2 Answers

WEN 6014: Motor is running, but chain doesn't move. Chain sprocket seems fine, cogs are only slightly worn, sprocket fits perfectly, no wear. Is there an internal clutch or connector? Motor worn out?


There is a clutch behind the metal housing where the chain sprocket at the engine end attaches to the chain . There are wear parts with springs on them that have to be changed. ChainSaw Shed Chain Saw Parts for Wen Wagner Brand Chain Saws Chains Bars... You can get parts here.

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1 Answer

Engine runs but wheels do not move


This could be a few things:
1) Your clutch plates may have worn out so that even when the bike is in gear, it will just rev, but no power will be transmitted to the drive shaft (smaller front chain sprocket is the driving gear, larger rear sprocket on the back wheel is the driven gear)
2) The front chain drive sprocket has come off under the cover on the motor - if the chain is really slack, have a look.
3) The front chain drive sprocket SHAFT has sheared. (basically, meaning that the shaft has broken into two parts as it couldn't handle the drive power (torque) being delivered through it to the chain drive) With the motor on, listen for grinding noises internally
when you rev, from the vicinity of the front chain drive cover. If its rough and grindy, the shaft may be sheared. Then with the motor off, take the cover off and leverage the small chain drive sprocket away from the motor with a screwdriver, and see if the shaft can just be pulled out of its sealed opening. Unfortunately with these bikes, the metals used in drive shafts and motors are not always heat-treated or hardened to the standard they should be, so shearing and premature failure can happen.
4) The gearbox or something in it has blown, unfortunately for the same reason above, quality related.
Its fair to say that these great little bikes are here for a good time, but not for a long time.

Apr 11, 2014 | Razor MX350 DIRT ROCKET - BLUE

1 Answer

Garage door opener: motor runs but chain doesnt move.


Depends on your mechanical ability. The drive gear is stripped. The part number is 41A2817 and is available at any door opener service company. It comes with instructions.

Jan 31, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Motor runs but chain does not move?


Check the chain drive sprocket to see if it moves when the motor runs. If not, there may be a sheared key between the shaft and sprocket or the teeth on the sprocket are badly worn off. Hope this helps!

Dec 22, 2009 | Garden

1 Answer

Sounds like chain jumping sprocket on right side.


so when you put it in gear it doesnt move with clutch disengaged???

Nov 02, 2009 | 2003 Yamaha YZ 250

1 Answer

I have a Sears Craftsman 1/2 horse garage door opener. When I push the button, I can hear it hum, but the chain won't move and it seems the sprocket is frozen?


If your door is stuck in the open position you will find the trolley is jammed against a bolt just in front of the motor unit. Remove that bolt and run the opener until the door closes. Now locate the 'up limit' control on the side of the motor unit and turn it 2 times in the opposite direction of the arrow printed on the cover. Replace the bolt.

Sep 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftman door opener brand new wont work?


Sounds like the drive gear is stripped. Remove the cover and take a look. It is white nylon and is just in front of the motor.

Jul 04, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman opener motor works, but chain does not move.


If the motor is working but the chain does not move you must remove the cover on the motor and check to see that the chain is on the sprocket. If the chain is on the sprocket and the sprocket is not moving but the motor shaft is moving then the sprocket must be retightened onto the motor shaft.

Apr 20, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener motor runs, but the chain drive doesnt turn


If the chain is not moving and the motor is – you need a gear kit.

Unplug the unit - take of the cover – you will find white shavings inside – these confirm the diagnosis. .

Get the gear AND sprocket kit.

It’s a good DIY project but you MUST VERY CAREFULLY Follow the instructions step by step.

HOPE THIS HELPS

Mar 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Chamberlain Power Drive 1/2 HP - motor runs but does not move chain


I have the same problem. I just removed the cover and discovered a nylon gear had been worn out. I found lots of shavings inside the cover. The nylon gear is beneath the exterior chain gear. I am looking for information on how to replace it, if I can find the part. If you decide to look at yours, unplug the power and remove the sheet metal screws securing the bottom portion of the cener cover to the front and back covers. Then just remove the upper screws from the center cover. Good luck.

Oct 08, 2008 | Chamberlain Powerdrive PD422D 1/2 HP...

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