LiftMaster 1702LM Quick-Release Lock
The LiftMaster 1702LM Quick-Release Lock is a keyed outside trolley release used for emergency manual access to garages where there may not be another entry point. It connects mechanically to the garage door opener release mechanism.
This accessory is commonly used on vault-type garages and other installations where a power outage, opener failure, or emergency situation could leave the garage inaccessible from the outside.
Common Use and Compatibility
The 1702LM is designed for compatible trolley-style garage door opener installations that use a pull-cord carriage release.
- LiftMaster residential trolley-style garage door openers when the release mechanism is compatible
- Chamberlain and Sears Craftsman trolley-style openers when confirmed by release design
- Vault-type garages and garages without a separate service door
- Applications requiring exterior manual release access
- Not intended as a direct fit for every wall-mount, jackshaft, or specialty opener system
Also Known As / Related Part Numbers
- 1702LM
- 1702LMC
- 7702C
- 7702CB
- Outside trolley release
- Garage door emergency release lock
- Quick-release lock
- 012381170258
Technician Note
The release cable must be routed so it pulls the trolley release cleanly without binding. After the trolley is released, the garage door may need to be manually locked for security until the opener is reconnected.
Before Ordering, Confirm
- The opener uses a standard trolley release mechanism
- The garage door does not have another reliable entry point
- The door thickness and lock mounting location are suitable
- The cable route from the lock to the trolley release is practical
- The garage door can move manually and is properly balanced
Professional Advisory
A quick-release lock should not be used to force open a damaged or unsafe garage door. If the door has broken springs, damaged cables, or will not move smoothly by hand, have the door serviced by a qualified garage door technician before relying on manual release operation.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain Group |
| Product Type | Outside Trolley Release Lock |
| Part Number | 1702LM |
| Application | Exterior manual release for garage door opener trolley |
| Compatible Operator Type | Select standard trolley-style residential garage door openers |
| Common Door Use | Vault-type garages and garages without separate entry doors |
| Operation | Mechanical keyed release with cable connection |
| Notes | Verify door thickness, opener release style, and cable routing before installation. |
Questions & Answers
What is the LiftMaster 1702LM used for?
The 1702LM is an outside trolley release lock that allows a garage door to be manually released from the opener from outside the garage.
Where is a quick-release lock commonly installed?
It is commonly installed on vault-type garages, garages without a separate entry door, or applications where outside emergency access is needed.
Does the 1702LM connect to power?
No. The 1702LM is a mechanical keyed release device with a cable connection to the opener trolley release mechanism.
Will the 1702LM work with all opener types?
It is intended for standard trolley-style garage door openers with a pull-cord carriage release. It is not for every jackshaft, wall-mount, or specialty opener setup.
What should be checked before installation?
Check the door thickness, trolley release style, cable route, lock location, and whether the door can be manually locked after the opener is released.
