Flag angle
3/8”-16
Hex nut
Horizontal
track angle
12” Radius horizontal
track with 3” front cable
lift sheave hole location
Horizontal track
15” Radius horizontal track
with 3” or 4” front cable lift
sheave hole location
or
12” Radius horizontal track
with 4” front cable lift
sheave hole location
3” or 4”
Front cable
lift sheave
Front cable lift sheave
Attaching Extension Springs
16
Remove the locking pliers from the vertical tracks.
WARNING
WITH ASSISTANCE, RAISE THE DOOR SLOWLY INTO THE OPEN POSITION
MAKING SURE THE DOOR TRAVELS SMOOTHLY THROUGH THE TRACKS.
CLAMP LOCKING PLIERS TO THE BACK LEG OF BOTH HORIZONTAL
TRACKS, BELOW THE BOTTOM TRACK ROLLERS TO KEEP THE DOOR
FROM LOWERING.
Locking
pliers
NOTE:
This illustration shows the outside of the door
in the open position.
Bottom
section
Track
roller
WARNING
FAILURE TO INSTALL SPRING RESTRAINT CABLES CAN RESULT IN
SEVERE OR FATAL INJURY IN CASE OF SPRING BREAKAGE.
Position (1) 5/16” - 18 x 3-3/4” eye bolt and (1) 5/16” - 18 hex nut into the rear back hang,
6” to 8” above the horizontal track, as shown. Feed the spring safety cable through the rear
back hang and tie the special knot around the “room side” of the 3 hole clip, as shown.
Secure the eye bolt and 3 hole clip to the rear back hang using (1) 5/16” - 18 hex nut. Hook
one end of the extension spring onto the eye bolt. Feed the spring safety cable through the
rear extension spring loop and center of the extension spring then front spring loop, pull the
spring safety cable taut and tie the special knot around the “jamb side” of the 3 hole clip.
Attach the “jamb side” 3 hole clip to the jamb near the flag angle using (1) 5/16” x 1-5/8” lag
bolt. Repeat the same process for the other side.
IMPORTANT:
SPRING RESTRAINT CABLES MUST BE TAUT AND EQUALIZED.
5/16”-18 x 3-3/4”
Eye bolt
Horizontal
track
Extension
spring
Back
view
Front view
Spring restraint
cable
Spring
restraint cable
Loop
5/16” x 1-5/8”
Lag bolt
3 Hole
clip
Special
knot
3 Hole
clip
Rear
back
hang
Extension
spring
5/16”-18 x 3-3/4”
Eye bolt
Extension
spring
Spring
restraint
cable
5/16”-18 x 3-3/4”
Eye bolt
Special
knot
3 Hole
clip
Rear
back
hang
Spring restraint
cable
Special
knot
5/16”-18 x 3-3/4”
Eye bolt
5/16”-18
Hex nut
Extension
spring
Horizontal track
5/16”-18
Hex nut
Horizontal track
5/16”-18
Hex nut
6”-8”
Attaching Spring Sheaves
17
Hook the sheave fork through the front loop of the extension spring and attach the sheave
fork to the rear cable lift sheave using (1) 3/8” - 16 x 1-1/4” hex head bolt and (1) 3/8” - 16
hex nut. Thread the counterbalance lift cable over the front cable lift sheave and around the
rear cable lift sheave and tie the special knot around the “horizontal angle” using a 3 hole
clip, as shown.
Insert one end of the large “S” hook into the “horizontal angle” with the 3 hole clip and the
other end into the second slot of the horizontal angle, as shown. Repeat for the other side.
IMPORTANT:
CLOSE “S” HOOKS AND EYE BOLTS WITH LOCKING PLIERS, TO PREVENT
SPRINGS FROM COMING LOOSE.
WARNING
FAILURE TO CLOSE “S” HOOKS AND EYE BOLTS CAN RESULT IN SEVER
OR FATAL INJURY IF SPRINGS COME LOOSE.
Rear
cable lift
sheave
Sheave fork
Horizontal track
Hook plate
This illustration shows doors featuring (2) pairs of extension springs
Counterbalance
lift cable
Counterbalance
lift cable
Spring restraint
cable
NOTE:
Some larger doors feature 2 pairs of extension springs. A spring restraint cable must
be installed through each spring.
Horizontal
track
Rear back hang
Extension
spring
3/8”-16 x 1-1/4”
Hex head bolt
3/8” - 16
Hex nut
Sheave fork
Extension spring
Rear cable
lift sheave
Sheave fork
Extension spring
Rear cable
lift sheave
3 Hole clip
Special
knot
Counterbalance
lift cable
“S”
Hook
“S”
Hook
Spring
restraint
cable
Counterbalance Lift Cable Adjustments
18
8
