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 1210EM:
• 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 1220EM:
• 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 1210EM
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
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 1220EM)
Sectional Doors
8-Tooth Sprocket Application (Model 1220EM)
(6-tooth sprocket can be used if slower travel
speed is desired.)
Motor Unit
Sprocket
Install Chain
In This Direction
Chain
Spreader
1210EM
1220EM
