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1/2 HP
GARAGE DOOR OPENER
OWNER’S
MANUAL
Model No.
139.18867
For Residential Use
Only
Caution:
Read and follow all
safety rules and
operating instructions
before first use of this
product.
Fasten the manual
near the garage door
after installation.
The Chamberlain Group, Inc.
Liftmaster Model Screw Drive
# 114A1794
Cover Illustration
5/3/94 - 6/14/94 - 10/18/94
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Safety Precautions
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Assembly
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Installation
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Adjustment
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Care and Maintenance
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Operation
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Troubleshooting
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Parts List
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MD
Sears Canada Inc. Toronto, Ontario M5B 2B8