LiftMaster 3950 3950 Manual - Page 5
Assembly, Attach the Drive Sprocket, Attach Mounting Brackets - used
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ASSEMBLY STEP 1 Attach the Drive Sprocket The drive sprocket can be installed on the right or left side of the operator depending on your installation. The drive sprocket has three holes to aid in the alignment of the drive sprocket with the door sprocket. 1. Insert the drive sprocket into the output shaft. 2. Align the center holes in the drive sprocket with the hole in the output shaft. 3. Insert bolts into the output shaft and the drive sprocket. 4. Finger tighten the bolts. Figure 1 Output Shaft Drive Sprocket Bolt Bolt ASSEMBLY STEP 2 Attach Mounting Brackets The operator can be mounted to the wall with the mounting brackets provided. An optional guide mounting bracket is available for purchase (see accessories). 1. Position two mounting brackets on each side of the operator. 2. Fasten the mounting brackets to the operator using the self-threading screws (8) provided. Figure 2 Mounting Brackets Operator 5