Chamberlain 1425E Owner's Manual page 13

ASSEMBLY STEP 4
For Sectional and One-Piece Doors Only
Install the Chain/Cable
and Attach the Sprocket Cover
INSTALLING THE
CHAIN/CABLE
1. Pull the cable loop from the
carton and fasten it to the
trolley with a master link from
the hardware bag (Figure 1).
• Push pins of master link bar
through cable loop 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
cable around the pulley.
3. 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.
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
Position the sprocket cover over the motor unit sprocket
so the three holes in cover align with the three holes in
mounting plate. Attach with #8x3/8" hex screws provided
(Figure 3).
Figure 3
Sprocket
Mounting
Plate
Leave Chain
& Cable
Inside Carton to
Prevent Kinking.
Keep Chain & Cable
Taut When Dispensing
Hex Screws
#8x3/8"
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.
Figure 1
Master Link
Clip-On Spring
Master Link Cap
Cable
Loop
Cable
Pulley
Install Chain & Cable
In This Direction
Figure 2
13
Master Link
Clip-On Spring
Master
Link Cap
Flat end
of Trolley
Threaded
Shaft
Master
Link Bar
Install Chain
Motor Unit
In This Direction
Sprocket
Chain
Pin
Notch
Pin