LDT, LDTB 13
To prevent possible SERIOUS INJURY or DEATH,
install reversing sensors when the 3-button control
station is out of sight of the door or any other control
(automatic or manual) is used. Reversing devices are
recommended for ALL installations.
CLUTCH ADJUSTMENT
1. Loosen the adjustment jam nuts until
there is little tension on the clutch
spring.
2. Tighten the inner jam nut gradually until
there is just enough tension to permit
the operator to move the door smoothly
but to allow the clutch to slip if the
door is obstructed. When the clutch is
properly adjusted, it should generally be
possible to stop the door by hand during
travel.
3. Tighten the outer jam nut and lock the
nuts in place by tightening them against
one another.
IMPORTANT NOTE:
The adjustable friction clutch is NOT an
automatic reversing device.
Clutch Hub
Fiber Disc
Spring
Adjustment
Jam Nuts
Washer
Clutch Pulley
On model LDTB, a brake is supplied from the factory. It is
designed to stop and hold the door in position whenever power is
removed from the motor.
On rst installation the brake should not need adjustment. The
brake operation should be inspected every 3 months. As the
brake pads wear, adjustments need to be made to maintain
proper operation.
With the power disconnected to the
operator, carefully try to rotate the large
drive pulley by hand. The brake should
be engaged and it should be very
difcult to turn.
While pushing the solenoid plunger
in by hand, there should now be
clearance between the brake pads
and the drum (approximately .020")
allowing the pulley to rotate freely. To
achieve the proper operation, adjust
the upper and lower pad spacing bolts
(A&B) accordingly.
BRAKE ADJUSTMENT
WARNING
To avoid SERIOUS PERSONAL
INJURY or DEATH from
electrocution, DISCONNECT
electric power BEFORE
performing any maintenance
WARNING
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