Liftmaster Garage Door Model 1265LM Opener Manual. Troubleshoot your Liftmaster 1265 1/2 hp chain drive garage door opener with the 1265LM opener Manual (40 pages). LiftMaster Professional Security+ 1200 Series 1/2 HP 1/3 HP. Brand: Chamberlain | Category: Garage Door Opener | Size: 1.39 MB Results 1 - 20 of 1670 - We're here to help. Support; > LiftMaster Model 3245, 3255, 3255-2 Owner's Manual. LiftMaster Model 3245, 3255, 3255-2 Owner's Manual. Download Manual 1/2 hp Chain Drive. Garage Door Opener. The Chamberlain Group, Inc. 845 Larch Avenue. Elmhurst, Illinois 60126-1196. ? Please read this manual and the 3255-2 1/2 HP Fasten the manual near the garage door after installation. This garage door opener has been designed and tested to offer safe service provided it is installed, operated, your local LIFTMASTER/CHAMBERLAIN dealer. Mar 12, 2017 -Liftmaster Garage Door Opener, Remote Control and Digital Keypad Manuals. Liftmaster are one of Opener Manuals. M200 Access Master Security+ 1/2 HP.