©2009 Overhead Door Corporation
Part Number 37027500123 02/26/2010 REV. 1
10
POWER HEAD & CHAIN DRIVE RAIL ASSEMBLY
NOTE: Handle carefully! Drive chain can slide out
of rail.
NOTE: For power head and rail assembly locate
Bag 1 from Box 1.
NOTE: Copy serial number from power head
frame and record it on warranty page.
1.
Attach rail assembly to power head by
aligning the sprocket onto the motor shaft.
Use (3) bolts, 5/16 -18 x 1/2"
(Fig. 1-2).
2.
Tighten the chain by turning the adjustment
nut clockwise.
The chain adjustment nut is
located in the Chain Pulley Bracket (opposite rail
end from the power head)
(Fig. 1-3).
3. Tighten chain until chain is approximately 1/8
inch above the base of the rail at midpoint on
the rail (Fig. 1-3). Do not over tighten chain.
CAUTION
You should have removed all ropes and/or
cables (NOT door lift cable) and disabled the
door lock already. If you have not, remove all
ropes and/or cables and disable garage door
lock NOW before continuing with installation
(Fig. 1-5).
Set assembled power head and rail aside. Begin with
Section 2 INSTALLATION.
Use
5/16"-18 x 1/2"
Bolts
FIG. 1-3
Chain adjustment.
Chain Pulley Bracket
(at wall end of rail)
Chain
T-Rail at center of rail assembly
1/8"
T-Rail
Chain
Tighten nut to move pulley this direction
Use 1/2" socket
on adjustment nut
FIG. 1-2
Rail - Power head assembly.
POWER HEAD & BELT DRIVE RAIL ASSEMBLY
NOTE: For power head and rail assembly locate
Bag 1 from Box 1.
NOTE: Copy serial number from power head
frame and record it on warranty page.
1.
Attach rail assembly to power head by
aligning the sprocket onto the motor shaft.
Use (3) bolts, 5/16 -18 x 1/2"
(Fig. 1-2).
2.
Tighten the belt by turning the adjustment
nut clockwise.
The belt adjustment nut is located
in the Belt Pulley Bracket (opposite rail end from
the power head)
(Fig. 1-4).
3. Tighten belt until belt is approximately 1/8
inch above the base of the rail at midpoint on
the rail (Fig. 1-4). Do not over tighten belt.
CAUTION
You should have removed all ropes and/or
cables (NOT door lift cable) and disabled the
door lock already. If you have not, remove all
ropes and/or cables and disable garage door
lock NOW before continuing with installation
(Fig. 1-5).
Set assembled power head and rail aside. Begin
with Section 2 INSTALLATION.
Belt Pulley Bracket
(at wall end of rail)
Belt
T-Rail at center of rail assembly
1/8"
T-Rail
Belt
Tighten nut to move pulley this direction
Use 1/2" socket
on adjustment nut
FIG. 1-5 Disable garage door lock.
Remove
Remove
FIG. 1-4 Belt adjustment.