Craftsman 139.53978SRT Garage Door Opener User Manual


 
Separate all hardware from the packages in the rail carton and the opener carton, as
shown below, for the assembly and installation procedures.
ASSEMBLY
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Lock Nut Lock Washer Nut
1/4"-20 (2) 3/8' (1) 3/8" (1)
Bolt 1/4"-20 x 1-5/4" (2)
Chain Spreader (2)
TroUey Threaded Shaft (1)
Master
Link(2)
O
U
Idler Bolt (1)
INSTALLATION
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Hex Screw Spacer (2) Nut Lock Washer Ring
5/16'-18x7/8" (4) 5/16"-18 (8) 5/16" (7) Fastener (3)
I
_] Illl II !!!rl!l I]ll II I1_ Screw ]"HlJ::]:''"'"I
5/16"-18xl-7/8" (2) 6ABx1-1/4 ° (2) 6-32x1" (2) Anchors (2)
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Clevis Pin CleVis Pin Clevis Pin Insulated
5/16"x1-1/2" (1) 5/16"xl" (1) 5/16"x1-1/4" (1) Staples (10)
SAFETY REVERSING SENSOR
Carriage Bolt Insulated
1/4"-20xl/2" (2) Wing Nut (2) Staples (20)