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ASSEMBLY STEP 4
For Sectional and One-Piece Doors Only
Install the Chain and Attach the
Sprocket Cover
INSTALLING THE CHAIN
1. Dispense a few inches of
chain from carton and
fasten to trolley with a
master link from the
hardware bag. (Figure 1).
• Push pins of master link
bar through chain link and
hole in front end of trolley.
• Push master link cap over pins and past pin notches.
• Slide clip-on spring over cap and onto pin notches until
both pins are securely locked in place.
2. With the trolley against the screwdriver, dispense the
chain around the pulley.
3. Model 1215EM:
• Continue along the rail and around the motor unit
sprocket (Figure 2). The sprocket teeth must engage
the chain. Continue forward to the trolley threaded
shaft.
Model 1225EM:
• Continue along the rail and around the motor unit
sprocket (Figure 2). Proceed back around the correct
groove in the chain spreader (Figure 3). The sprocket
teeth must engage the chain.
4. Use the second master link to connect the chain to the
flat end of the shaft (Figure 1). Check to make sure the
chain is not twisted.
5. Remove the screwdriver.
ATTACHING THE SPROCKET COVER 1215EM ONLY
Insert the back tab in the slot on the back of the mounting
plate. Squeeze the cover slightly and insert the front tab
(Figure 4).
13
To avoid possible SERIOUS INJURY to fingers from moving
garage door opener:
• ALWAYS keep hand clear of sprocket while operating opener.
• Securely attach sprocket cover BEFORE operating.
Motor Unit
Sprocket
Install Chain
In This Direction
Chain
Spreader
Figure 2
Sprocket
Cover
Mounting
Plate
Front Tab Slot
Back Tab Slot
Top of Motor Unit
Figure 4
Master
Link Bar
Flat End
of Trolley
Trolley
Pin
Pin Notch
Flat End of
Threaded Shaft
Master Link
Clip-On Spring
Master
Link Cap
Install Chain
In This Direction
Chain
Pulley
Bracket
Figure 1
Leave Chain
& Cable
Inside Carton to
Prevent Kinking
Keep Chain
Taut When Dispensing
6-Tooth
Sprocket
Opener
Mounting Plate
Chain
Spreader
8-Tooth
Sprocket
Opener
Mounting Plate
Chain
Spreader
Figure 3
One-Piece Doors
6-Tooth Sprocket Application (Model 1225EM)
Sectional Doors
8-Tooth Sprocket Application (Model 1225EM)
(6-tooth sprocket can be used if slower travel speed is
desired.)