12
ADJUSTMENTS—POWER DRIVE SYSTEM
Bottom Bar
Assembly
Breakaway Tab
COUNTERBALANCE SYSTEM
The door is counterbalanced by means of a counter-
weight on a pulley system that is installed in each side
column assembly. The counterbalance is designed to
reduce the effort required to open and close the door.
(See Figure 27)
A8500212
Rubber Reversing Edge
Inside Floor Loop
Counterweight Strap
Figure 25
POWER DRIVE SYSTEM
The Turbo-Seal power drive system consists of a drive
motor gearbox assembly and an electric brake system.
The power drive system incorporates an electric brake
used to stop the door travel when electrical power to the
door is shut off. A manual brake release is provided for
manual opening or closing of the door should there be a
power failure, or if routine maintenance needs to be
done with the power disconnected.
Counterweight
A8500213
ADJUSTMENTS
Figure 27
Side Column
Assembly
The drive chain is easily adjustable by
moving the power
drive system on a
sliding plate assembly. (See Figure 26)
Drive Chain
Drive Motor
Gearbox
Assembly
PNEUMATIC REVERSING EDGE SWITCH
ADJUSTMENT
Do not stand under the door panel when
making check. If reversing edge switch is
not working properly, panel could strike
person performing check.
To check the reversing edge switch operation, run the
door through the down cycle. As the door is lowering,
tap the bottom of the reversing edge. If the reversing
edge switch is operating properly, the door should
immediately reverse and run to the fully open position.
Reset the control system after the check is completed.
If the door does not reverse, check the air bleed and
sensitivity of the reversing edge switch. The switch is in
the bottom bar on the side opposite the coil cord.
A8500079
Figure 26