Craftsman 139.53335SRT3 Owner's Manual page 22

Installation Step 10 I
Install the Safety Reversing Sensor
I
Figures 2 and 3 show assembly of brackets and
"C" wrap based on the recommended installation of
the sensors as shown on page 21.
However, Figures 4 and 5 are variations which may
fit your installation requirements better. Make sure
the wraps and brackets are aligned so the
sensors will face each other across the garage
door.
i Fasten the "C" wraps to the mounting brackets
having square holes, using the hardware shown
in Figure 2.
Connect each assembly to a slotted bracket, using
the hardware shown in Figure 3.
Note the alignment of the brackets for left and
right sides of the door.
• Finger tighten the lock nuts.
• Use bracket mounting holes as a template to
locate and drill (2) 3/16" diameter pilot holes on
both sides of the garage door, 4"-6" above the
floor but not exceeding 6" (See warning on
page 21 .)
• Attach bracket assemblies with 1/4"x1-1/2" lag
screws as shown in Figure 3.
• Adjust right and left side bracket assemblies to the
same distance out from the mounting surface.
Make sure all door hardware obstructions are
cleared. Tighten the nuts securely.
Figure 2
#10 - 32
Lock Nuts
Figure 3
Mounting Bracket
With Square Holes
1/4 x 1-1/2"
Lag Screws
Mounting Bracket
with Square Holes
"C" Wrap
#10-32x3/8"
Screws
1/4-20 x 1/2" CarriageBolts
(withsquareshoulder)
'C" Wrap
©
#10 - 32 x 3/8" #10 x32
Screw Lock Nut
Hardware Shown Actual Size
©
1/4" - 20 x 1/2" 1/4" - 20
Lag Screw Staples Carriage Bolts Lock Nut
Figure 4
Alternate Wall Mount
Mounting Bracket
with Blot
Mounting Bracket
with Square Holes
with wire
Indicator Light
Figure 5
/
Alternate Floor Mount
iiiiiii iiill
Floor --
Sensor with wire
Indicator Light
_" Mounting Bracket
with Square Holes
Mounting Bracket
with Slot
Attach with
concrete anchors
22