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Garage door extension spring installation instructions.

extension spring installation instructions
Extension spring doors must never be operated without a properly installed spring containment cable.
Please follow the extension spring installation instructions carefully.

Step 1

Some doors will be supplied with two springs and some will have four. Assemble springs with sheaves on the floor. A 3/8" x 1-1/4" bolt and nut are used to attach the sheave.
(FIG. EXT-1)

extension spring installation instructions

NOTE: If your door was supplied with four large extension springs, take notice of the color coding on the ends of the springs. If there are two color codes, be sure to use one of each on either side so that the spring tension is equal on both sides.

Step 2:

Attach a sheave in the third hole on the angle approximately 4 inches from the wall on both sides. Use a 3/8" x 1-1/4" bolt, 3/8" washer and nut.The head of the bolt must be on the door side. (FIG. EXT-2)

extension spring illustration

Step 3:

Attach the eye bolts with one 5/16" nut on each side of the rear hanger. The eyebolts should be about 12 inches above the track to keep the spring assembly from dragging on the track. The eyebolts can be as low as 4 inches above the track if you have space problems. Tighten the eyebolt nuts.
(FIG. EXT-3)

extension spring

Step 4:

Carefully raise the door and prop it about halfway open. (FIG. EXT-4)

assembling extension springs

garage door torsion spring
This is the first time the new door is being opened. If the tracks are not correctly aligned or the back hangers are not strong enough the door may fall. Also, the door will be very heavy without the help of the springs. Have two or more people help you. Proceed slowly and carefully.
Please follow the extension spring installation instructions carefully.

Check to be sure the horizontal tracks are parallel with each side of the door. With the door about halfway open, make sure the rollers do not come out of the top brackets more than about 1/2". If adjustment of the rear hangers is necessary, lower the door first because the weight of the door is supported by the rear hangers.

Step 5:

Carefully raise the door to fully open position. Place “C