Craftsman 139.53975SRT - Manual (Page 9)

Assembly Step 2
Fasten the Rail to the Opener
• Insert a 1/4"-20x1 -3/4 bolt into the cover
protection bolt hole on the back end of the rail as
shown. Tighten securely with a 1/4"-20 iock nut.
• Remove the two screws from the top of the
opener.
• Attach spreaders to the U bracket by snapping
them into place. ^
• Place the U bracket, flaTsfiJe down, on the opener
and align the bracket holes with the screw holes.
Fasten with the previously removed screws.
• Align the rail assembly with the top of the opener,
and slide the rail end onto the U-bracket as far as
it wiii go.
To fasten raff, use only those screws mounted
in the top of the opener. Any other screws wifi
cause serious damage to the opener.
Assembly Step 3
install the Idler Pulley
Lay the chain/cable beside the rail, as shown.
Grasp the end with the cable loop and pass
approximately 12“ of cable through the window.
Allow it to hang until Assembly Step 5.
Remove the tape from the idler pulley. The inside
center should be pre-greased. If dry, regrease to
ensure proper operation.
Place the idler pulley into the window as shown.
Insert the idler bolt from the top through the rail
and pulley. Tighten with a 3/8" lock washer and
nut underneath the rail until the lock washer is
compressed.
Rotate the pulley to be sure it spins freely.
Insert a 1/4"-20x1-3/4 bolt into the trolley stop
hole in the front of the rail as shown. Tighten
securely with a 1/4"-20 lock nut.
Chain and
Cable
3/8" Lock
Washer
Idler Pulley
Hardware Shown Actual Size
Idler Boll
Bolt 1/4'-20x 1-3/4 Lock Nul 1/4'-20 Nut 3/8' Lock Washer 3/8'