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If you hit the button & the Motor runs but the Chain won't turn then this is likely what you looking for

" Fix it Yourself "

This item is Brand New Compatible with ALL fail safe units from Liftmaster, Chamberlain, Crafstman, Sears, Master Mechanic and Wayne Dalton.

This is the same nylon gear as the one in kits 41A2817 & 41C4220A and also includes instructions.

You will need to provide your own gear Grease (Important without grease gear will strip again) (be sure to use) which is required during installation.

 If you only need the nylon drive gear, save some money by purchasing this gear only .

 3 replacement manufacturer part #

Drive Gears # 41A2817  

same as picture

For the Directions (For do it yourselfer) Click link below

This works with chain drive garage door openers manufactured (1984-current) by Chamberlain or Liftmaster or Craftsman.

• BELOW IS PARTIAL LIST OF COMPATIBLE MODELS

  41A2817 Drive Gear  This gear is compatible with CHAIN DRIVE and BELT DRIVE Liftmaster, Chamberlain, Sears, Craftsman  , Garage master, Access master, Master Mechanic, Security +, Estate series, Raynor, Formula I, Whisper drive, Power Drive, Billion Code garage door opener models manufactured 1984 through present.

   LiftMaster, Chamberlain CHAIN DRIVE garage door opener models:          1040, 1045, 1046, 1050, 1055, 1056, 1060, 100WD, 200WD, 300WD, 110WD, 210WD, 310WD,   1260LK, 1245LK, 215WD, 220ED, 315WD, 320WD, 1240R, 1245R, 1246R, 1255R, 1256R, 985, 2565, 2575, 2595, 140, 150, 240, 350, 450, 550, 700WHC, 701WHC, 1000, 2000, 4000, 4001, 5000, 710WHC, 711WHC, 1100, 2100, 4100, 5100, 7200, 1200, 2200, 4200, 6200, 7220, CG40, 7420, PD752, PD758S -

   LiftMaster, Chamberlain BELT DRIVE garage door opener models:            
  

• 1280, 1280R,  2580, 2585, 8100, 8100M, 8200, 9200,  WD922K, WD912KS, WD822KS

  Liftmaster, chamberlain, Craftsman, Sears, Master Mechanic and Wayne Dalton models:            

  Compatible with 1140, 1145, 1146, 1150, 1155, 1156, 1160, 1200 Series, 1240, 1245, 1245-266, 1246, 1250, 1250-266, 1255, 1255-166, 1255-266, 1256, 1260, 1260-166, 1260-266, 1265, 1265-267, 1270, 2245, 2255, 2265, 2265-267, 2280, 2280-267, 2280-976, 2580, PD210, PD212, PD610, PD612K, ATS211R, ATS211, WD822K and more.
  

• Not all models listed.

• Drive Gear Bore Size: 1/2"


• Drive Gear Outside Diameter: 2 3/4"


• Drive Gear Number of Teeth: 32