14
LEFT LOCK-ON SIDE
BEARING BRACKET
LIFT CABLE
SIDE
SPRING
ANCHOR
BRACKET
LEFT
WOUND
SPRING
RED
CABLE
DRUM
SLOT
LIFT CABLE
LOCKING PLIERS
LEFT HALF
TORSION
TUBE
SET SCREWS
SIDE SPRING
ANCHOR BRACKET
RIGHT LOCK-ON
SIDE BEARING BRACKET
RIGHT
WOUND
SPRING
RIGHT HALF
TORSION TUBE
BLACK CABLE
DRUM
CENTER
LINE
CENTER BEARING BRACKET
Observe lock-on side bearing brackets center line. Mark same location
and drill holes for center bearing bracket. If its on the same surface as
the lock-on side bearing brackets, it will fasten directly to the header.
(See Figure 17B). For odd surfaces add punched angle. Keep the
torsion tube straight! (See Alternate 17B) Wide doors are furnished
with two center bearing brackets.
Lift the left half of the torsion spring assembly up and slide the torsion
tube into the left lock-on side bearing bracket. (See Figure 17A) Fasten
the center bearing bracket. (See Figure 17B)
Lift the right half of the torsion spring assembly up and slide the torsion
tube into the right lock-on side bearing bracket. (See Figure 17C) Slide
the right torsion tube into the torsion tube coupler and fasten. (See
Figure 17D)
STEP 21
Heavy Commercial size doors
are furnished with 2 extra springs,
which must be fastened to two extra center spring brackets. (See
Supplement F)
STEP 22
Starting at the left side,
draw the lift cable up behind the roller shafts
between the vertical track and the left side of the door. Slip the lift cable
through the slot in the left side of the cable drum. Pull on the lift cable
until the lift cable button stops and is tight against the
red
cable drum
slot. Wind the remaining lift cable onto the
red
cable drum by hand,
carefully following the groove. Push the
red
cable drum against the left
lock-on side bearing bracket and tighten the two 3/8“ set screws until
you feel pressure on your wrench then tighten ½ to 1 turn. The set
screws dimple slightly into the torsion tube. Rotate the
red
cable drum
and torsion tube until the lift cable is taut. Clamp locking pliers to the
torsion tube and brace them against the header to keep the lift cable
taut and from unwinding. (See Figure 17A) Hex socket set screws and
grey stealth plugs are furnished with 4” (102) cable drums only.
STEP 23
Repeat the procedure in STEP 22 for attaching the lift cable, on the
right side, to the
black
cable drum. Do not remove the locking pliers!
The lift cable must be set equally taut. If
black
cable drum is fastened
first, the lift cables may not be equally taut. (See Figure 17C)
After fastening cable drums, fasten the side spring anchor
brackets to the lock-on side bearing brackets. (See Figure
18A,18B)
STEP 24
Fasten the optional commercial door side latch, if provided, to the
inside of the #3 door section, as shown on page 16.
ALTERNATE 17B
FIGURE 17B
FIGURE 17A
FIGURE 17C
CENTER BEARING
BRACKET
TORSION TUBE
COUPLER
5/16“ X 2”
LAG SCREWS
PUNCHED
ANGLE
UP TO CEILING
3/8“ X 1” SHORT NECK
CARRIAGE BOLTS AND
3/8“ LOCK NUTS
PUNCHED ANGLE
FORWARD TO HEADER
CENTER BEARING INSTALLATION TO
CEILING OR ODD HEADER LOCATION.
--KEEP TORSION TUBE STRAIGHT--
LEFT HALF
TORSION TUBE
CENTER LINE
OPTIONAL
FIGURE 17D
3/8“ LOCK NUT
5/16“ X 2”
LAG SCREW
RIGHT HALF
TORSION TUBE
3/8“ X 1-1/2” HEX
HEAD BOLT
TORSION TUBE
COUPLER
CENTER BEARING
BRACKET
FOR HEX SOCKET
SET SCREWS USE
3/16” HEX KEY (ALLEN WRENCH)
4” (102) CABLE DRUMS ONLY
CENTER
LINE
CENTER
LINE
COPYRIGHT © 2004 MARTIN DOOR
