Chamberlain 041D8615, Manual

2

Installation

1

Attach the shaft collar to garage door opener

To avoid installation diffi culties, do not run the garage door opener until 
instructed to do so. 

1.  Loosen the set screws.

2.  Attach shaft collar to the garage door opener motor shaft. The side of the shaft 

collar with the larger hole should be placed on the motor shaft. Ensure that the 
shaft collar is seated all the way on motor shaft until stop is reached.

3.  Position the shaft collar so the screws are facing out and are accessible when 

attached to the torsion bar.

4.  Securely tighten the 2 square head set screws closest to the motor shaft by 

turning the screws 1/4 - 1/2 turn after making contact with the motor shaft.

Set
Screws

Shaft Collar

Motor
Shaft

To prevent possible SERIOUS INJURY or DEATH:
•   Concrete anchors MUST be used if mounting bracket into masonry.
•   NEVER try to loosen, move or adjust garage door, springs, cables, pulleys, 

brackets or their hardware, ALL of which are under EXTREME tension. 

•   ALWAYS call a trained door systems technician if garage door binds, sticks or 

is out of balance. An unbalanced garage door might NOT reverse when required.

•   Garage door opener MUST be mounted at a right angle to the torsion bar to 

avoid premature wear on the collar.

•   Upon completion of Installation, test safety reversal system. Door MUST 

reverse on contact with a 1-1/2" (3.8 cm) high object (or a 2x4 laid fl at) on the 
fl oor.

To prevent possible SERIOUS INJURY or DEATH, the collar MUST be properly 
tightened. The door may NOT reverse correctly or limits may be lost due to collar 
slip.

2

Position and mount the garage door opener

NOTE:

For additional mounting options, refer to your owner's manual.

1.  Close the garage door completely.

2.  Slide the garage door opener onto the end of the torsion bar. 

 NOTE: 

Ensure the shaft collar does NOT touch the bearing. 

If the replacement shaft collar matches the previous shaft collar, align the garage 
door opener mounting bracket to the existing holes. Use a level to position and 
vertically align the garage door opener. Skip to Step 6. 

If the replacement shaft collar does 

NOT

 match the previous shaft collar, start at 

Step 3.

3.  To mark new mounting holes: Tighten the set screws on the torsion bar to hold 

the garage door opener in place while marking the new mounting holes using 
the mounting bracket. Use a level to position and vertically align the garage 
door opener. 

NOTE:

 The garage door opener does not have to be fl ush to the wall.

4.  After marking new mounting holes, remove the garage door opener from the 

torsion bar. Drill 3/16" pilot holes at the marked locations. Drill through metal 
door rail plates if necessary.

5.  Slide the garage door opener back onto the torsion bar until the pilot holes 

align with mounting bracket. 

6.  Tighten the 2 square head set screws on the torsion bar. For a hollow torsion 

bar, tighten screws 3/4 - 1 full turn after making contact with the bar. For a 
solid shaft torsion bar, tighten screws 1/4 - no more than 1/2 turn after making 
contact with the shaft. If installing on a keyed torsion bar, DO NOT tighten the 
set screws into the keyway.

7.  Secure the mounting bracket to the wall and to the garage door opener. Use the 

14-10 x 2" screws to secure the mounting bracket to the wall.

Set screws
(Torsion bar) 

Bearing
Plate

Shaft
Collar

Torsion Bar

.25" (.6 cm) min. 
space between 
bearing and 
shaft collar

Mounting Bracket 

Screws 14-10 x 2"