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LDO & LSO GARAGE DOOR OPERATOR OPEN LIMIT SWITCH ADJUSTMENT
Copyright © 2008 Linear LLC P484 X5
TECHNICAL BULLETIN
TB2008-002
ISSUE DATE: 4/8/2008
IMPORTANT BULLETIN - FIELD ACTION REQUIRED
This bulletin applies to all Linear Model LDO & LSO garage
door operators manufactured from December 3rd, 2007
to April 6th, 2008. Products manufactured between these
dates have the preset factory location of the open limit
adjustment set abnormally high. This can affect operator
setup and testing in 7-foot and 8-foot rail installations.
To prevent possible damage to the operator and/or
rail components, BEFORE APPLYING POWER TO THE
OPERATOR, turn the OPEN LIMIT adjustment screw
downward (counterclockwise) seven (7) full turns. This
will return the operator to the normal factory setting.
After adjusting, FOLLOW ALL PRINTED INSTRUCTIONS
supplied with the operator.
If the open limit is not readjusted prior to testing the
operator, with the trolley disconnected from the traveler
(also known as the inner slide), it is possible to overrun
the traveler into the drive sprocket during testing. This
can cause damage to the traveler and/or the operator.
How to identify affected products:
The date of manufacture is stamped on the outside of the
operator’s packing box above the product identifi cation
label. If the product has already been corrected at the
factory, a light blue dot will be seen on or near the
label. Operators produced after April 7th, 2008 have
the correct preset open limit setting and no fi eld action
is required.
LDO33 and LDO50 Garage Door Operators
LSO50 Garage Door Operator
Adjusting the Open Limit on an LDO Operator
USE A SCREWDRIVER TO ADJUST
THE OPEN LIMIT DOWNWARD
SEVEN FULL TURNS
COUNTERCLOCKWISE
OPEN LIMIT
ADJUSTMENT
DOWN