Chamberlain LiftMaster Security+ 1256R User Manual

ASSEMBLY STEP 2
Attach the Chain Spreader
and Re-install the Chain
MODELS 1256R AND 1246R ONLY
• Line up the holes in the chain spreader with the
holes in the motor unit as shown, The slot in the
chain spreader must fit over the Rail flange
(Figure 1).
• 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
(Figure 2).
• 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
(Figure 3).
• Continue dispensing the chain forward to the
trolley (Figure 4). Reconnect the trolley to the
trolley threaded shaft, Proceed to Assembly
Step 3 for chain tightening instructions.
Toavoid possible SERIOUSINJURYto fingers from
moving garage door opener:
• ALWAYSkeep hand clear of sprocket while operating
opener.
• Securely attachsprocket cover BEFOREoperating.
#8xl" _--_
Hex Screw _i
_._ Washers
Chain
Spreader
Slot
I
Figure 1
Rail
Flange
Figure 2
Outer Inner Nut Trolley
Nut and Washer Threaded Shaft
Chain
Spreader 8-Tooth
\
Sprocket
Motor Unit
___-- _ing Plate
Chain
Spreader 6-Tooth
Sprocket
-- ,-___ Motor Unit
_if Iv "_ o°_U_ng Plate
Figure 3
_. Install Chain
._ in This Direction
Chain _ P
cket
10

Chamberlain LiftMaster Security+ 1256R Specifications

General

Brand	Chamberlain
Model	LiftMaster Security+ 1256R
Category	Garage Door Opener
Language	English