Sears 139.53960SRT Install the Idler Pulley, Hardware Shown Actual Size, On TOP and Sides Bracket

ASSEMBLY STEP 2

Fasten the Rail to the Motor Unit

• Insert a 1/4"-20xl-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 lock nut.

To avoid seriousdamageto garagedoor opener,use only those screwsmountedin the top of the opener.

•	Remove the two screws from the top of the motor
	unit.
•	Attach spreaders to the U bracket by snapping
	them into place.
•	Place the U bracket, flat side down, on the motor
	unit and align the bracket holes with the screw
	holes. Fasten with the previously removed screws.
•	Align the rail assembly with the top of the motor
	unit. Slide the rail end onto the U-bracket, all the
	way to the steps that protrude on the top and sides
	of the bracket.

HARDWARE SHOWN ACTUAL SIZE	_'_'1
Bolt 1/4"-20 x 1-3/4	1/#-20

Screws

"U" Bracket

Bolt

I Cover

SLIDE RAIL TO STOP

ON TOP AND SIDES

OF BRACKET

Lock Nut

Motor Unit

Sprocket

into Back Slots1

then Snap Tab Into FrontSIot

ASSEMBLY STEP 3

Install the Idler Pulley

Chain and Cable

•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 bo?tfrom 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"-20xl-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.

				Bolt --_
			TrcJIley
			St_p	HoIe I
	Inside	Pulley		i
	Idler		_
	Grease
3/8"Lock	Pulley
Washer_
	•	Cable Loop	Idler	Pulley

HARDWARE SHOWN ACTUAL SIZE

Idler B01t Bolt1/4"-20 x 1-3/4 L0ckNut 1/4"-20 Nut 3/8" LockWasher 3/8"

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