COPYRIGHT © 2004 MARTIN DOOR
20
LOW CLEARANCE TRACK WITH TORSION
SPRINGS AT THE FRONT
• 8“ (203) clearance is required above top of
closed door with 4” (102) cable drums.
• 10“ (254) clearance is required above top of
closed door with 5-1/4” (133) cable drums.
• Cut off the bottom of the reverse angle shields
and the vertical tracks 3-3/4“ (95).
• The top of the vertical track should be about
11-3/4“ (298) from the top of the closed door.
STEPS 1 to 16
Follow the regular instruction manual except place
five cardboard strips on each side of the door
opening, under the reverse angle shields and
under the door. Add or subtract if floor is out of
level. See STEP 1 and 8.
NOTE: Setting door, track, and RA or RB shields
on a level floor with no cardboard strips may save
1/2” (13) of the required clearance. However, the
adjustments of the low clearance tracks and top
roller brackets will be limited.
STEP 17
Follow regular instruction manual except the top of
vertical tracks should be about 11-3/4“ (298) down
from the top of the closed door. (See Figure C1)
• Fasten the lock-on side bearing brackets to the
horizontal track angles as explained in
STEP 18, also Figures 14A and 14B.
• Fasten the front of the low clearance tracks
above the horizontal tracks to the third hole of
the horizontal track angle. (See Figure C1)
• Fasten the back of the low clearance tracks
above the horizontal tracks to the punched
angle. (See Figure C2)
• For doors over 8’ (2440) high, cut a 1’ (25)
punched angle bracket from a punched angle
and fasten the punched angle bracket in the
holes provided, near the center of the low
clearance tracks and the horizontal track angle.
(See Figure C6)
FIGURE C1
SUPPLEMENT C-
I
SPLICE
PLATE OR
SPLICE
BRACKET
LOW CLEARANCE
TRACK
1/4“ LOCK NUT
LOCK-ON SIDE
BEARING BRACKET
ABOUT
11-3/4“
(298)
FIGURE C4
TORSION TUBE
LOW CLEARANCE
TRACK
SPLICE
PLATE OR
SPLICE
BRACKET
“L” STRUT
TORSION
SPRING
SIDE SPRING
ANCHOR BRACKET
RED
CABLE DRUM
HORIZONTAL
TRACK CURVE
FLAG
TOP ROLLER
BRACKET
(REVERSED)
HORIZONTAL
TRACK ANGLE
FIGURE C3
TOP ROLLER
BRACKET
(REVERSED)
1/4“ X 1” THREAD
FORMING SCREW
“L” STRUT
LOW CLEARANCE
TRACK
LOCK-ON SIDE
BEARING BRACKET
8”(203)
TOP OF
CABLE
DRUM
(ALSO SEE STEP 18 NOTE)
FIGURE C2
3/8“X1” SHORT NECK CARRIAGE
SAFETY BOLTS AND 3/8“ LOCK NUTS
3/8“ X 1” SHORT NECK CARRIAGE
BOLT AND 3/8“ LOCK NUT
OPTIONAL
PUNCHED
ANGLE
LOW CLEARANCE
TRACK
HORIZONTAL TRACK
1/4“X1/2” SHORT NECK
CARRIAGE BOLT
WIDE WOOD DOORS
HAVE 3” (76) “U” STRUTS
