LiftMaster 3950 3950 Addendum Manual - Page 5

Drum Condition, Minimum Side Room, Dead Shaft Door Offset - operator

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2.5" Min. Clearance 2" Max Inset 3" Bolt Clearance Figure 6 - Dead Shaft Door Offset Drum Condition The door drum on the side on which the Model 3950 is to be mounted must not be bent or damaged in order for installation to be successful. If bent, the drive chain may not align to the sprocket well and could derail the chain. Minimum Side Room The minimum amount of side room depends on the mounting option for the Model 3950. For a standard wall mount to the outside of the door opening, a minimum of 11" is required for the operator, however, the door brackets must also be considered if they interfere with operator installation. Dead Shaft Door brackets should be moved away from the door assembly to provide enough room for the desired operator mounting position. 5

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Figure 6 - Dead Shaft Door Offset
Drum Condition
The door drum on the side on which the Model 3950 is to be mounted must not be bent or damaged in order for installation to be
successful. If bent, the drive chain may not align to the sprocket well and could derail the chain.
Minimum Side Room
The minimum amount of side room depends on the mounting option for the Model 3950. For a standard wall mount to the outside of the
door opening, a minimum of 11" is required for the operator, however, the door brackets must also be considered if they interfere with
operator installation. Dead Shaft Door brackets should be moved away from the door assembly to provide enough room for the desired
operator mounting position.
2.5" Min.
Clearance
3" Bolt
Clearance
2" Max Inset