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) 
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) 
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) 
Step 4:Carefully raise
the door and prop it about halfway open. (FIG. EXT-4) 
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” clamps on both sides of the
track below the bottom rollers to keep the door from falling closed. (FIG.
EXT-5) 
Check again to be sure the horizontal tracks are parallel with the
edges of the door. The rollers must not come out of the hinges or
brackets.
Step 6:Hook the ends of
the springs over the eyebolts at the rear track hangers. Attach the loop
of a cable over the button on the bottom bracket, if not done so already.
Thread the cable up over the stationary sheave.
(FIG. EXT-6) 
Continue the cable over and
around the sheave on the springs. (FIG. EXT-7) 
Step 7:Tie the cable to
the three hole adjusting clip exactly as shown in Fig. EXT-8A. Hook the
cable to the horizontal angle with an “S” hook. Adjust the knot at the
three hole adjusting clip. Adjust so that all spring tension is relieved
and the cable holds the springs above the horizontal track. The springs
should be stretched the same on both sides of the door. (FIG. EXT-8A) 
Important: Attach the warning tag found in the white
envelope with orange print to the spring assembly (this tag may already be
attached). (FIG. EXT-9)
Installing Safety Containment Kit
Garage door extension springs can cause serious injury and
property damage if they break under tension and are not secured with
safety cables. Do not neglect the following step.
Please follow the extension spring installation instructions carefully.
Step 8Tie one end of the 1/8" containment cable to the rear track
hangers. Tie the cable as shown in the illustration (FIG. EXT-9). Thread
the cable through the center of the extension spring and through the
bushing in the sheave fork. Tie the remaining end to the horizontal angle
as shown. This must be done for each of the springs.
NOTE: If your door has four extension springs, tie the upper
containment cable to an angle clip mounted to the jamb. (FIG.
EXT-9) 
Use extreme care when readjusting extension springs and make sure that the door
is carefully secured by “C” clamps in the open position before you begin. When the door is closed,
the springs and mounting hardware are under extreme tension and are potentially dangerous.
Please follow the extension spring installation instructions carefully.
To adjust extension spring tension, use two “C” clamps to carefully clamp the door in
the open position. Tension can be changed by moving the “S” hooks to different
holes in the horizontal track angles or by adjusting the cable in the three hole clip. Both sides must
be adjusted equally. Moving the hooks closer to the door opening increases tension.
Tension can also be adjusted slightly by releasing spring tension and relocating the eyebolts higher
on the track hanger. When reinstalling, the higher the eyebolt, the greater the tension.
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