Chamberlain 1200 - Manual (Page 10)

Assembly Step 2
Attach the Chain Spreader
and Re-install the Chain
For Models 1256 and 1246 only
10
Chain
Spreader
#8x1"
Hex Screw
USE ONLY
THIS TYPE
AND SIZE
SCREW
T-rail
Flange
Slot
Washers
Trolley
Trolley
Threaded
Shaft
Outer
Nut
T-rail
Inner Nut
and Washer
Opener
Sprocket
Install Chain
In This Direction
Chain
Spreader
Chain
8-Tooth
Sprocket
6-Tooth
Sprocket
Chain
Spreader
Opener
Mounting Plate
Opener
Mounting Plate
Chain
Spreader
• Line up the holes in the chain spreader with the
holes in the opener as shown. The slot in the chain
spreader must fit over the T-rail flange.
• Securely fasten the chain spreader with the
hardware provided.
• Remove the trolley threaded shaft from the trolley
by loosening the inner nut and lock washer.
• Guide the chain around the selected groove in the
chain spreader (to engage either the
8-tooth sprocket or the 6-tooth sprocket) as shown.
• Continue dispensing the chain forward to the
trolley. Reconnect the trolley to the trolley threaded
shaft. Proceed to page 11 for chain tightening
instructions.
Serious injury can result if fingers become
entangled in moving opener sprocket. Attach
sprocket cover securely. Never operate opener
while your hand is near the opener sprocket.
WARNING