Liftmaster 73-18457, FRAME
The LiftMaster 73-18457 is a frame assembly service part for the SW490 swing gate operator. The frame is the structural base that supports and positions key internal components, so it is more than a cosmetic replacement. A bent or damaged frame can cause alignment problems, cover fit issues, unusual mechanical noise, or premature wear on connected drive components.
This type of replacement is usually considered during a larger operator repair, rebuild, or restoration after impact damage, corrosion, or heavy service wear. Because the frame affects the physical relationship between the motor, gearbox, covers, and gate drive hardware, the part must be matched to the correct operator model. Always verify the SW490 parts diagram and inspect the gate for external causes of the damage before replacing the frame.
Compatible With
- LiftMaster SW490 swing gate operators
- LiftMaster SW490GL swing gate operator references where the parts diagram confirms frame assembly 73-18457
- Commercial swing gate operator repairs requiring the 73-18457 frame assembly
- Not for LA400, LA500, CSW200, RSW, or unrelated swing gate operator families
Features and Specifications
| Manufacturer | LiftMaster / Chamberlain Group |
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| Product Type | Frame assembly |
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| Part Number | 73-18457 |
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| Application | SW490 swing gate operator structural repair |
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| Compatible Operator Type | Swing gate operator |
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| Material / Finish | Verify current LiftMaster part supply |
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| Notes | Confirm model and parts diagram before ordering |
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Also Known As / Related Part Numbers
- 73-18457
- LM-73-18457
- LiftMaster 73-18457 frame
- Frame Assembly SW490
- SW490 frame assembly
Technician Note
If the original frame is bent, check for gate binding, operator impact, bad hinges, or mounting issues. Replacing the frame without correcting the cause may lead to another failure.
Before Ordering
- Confirm the operator is an SW490 or supported SW490GL configuration
- Compare the frame callout in the parts diagram
- Inspect the existing frame, cover, and mounting points
- Check gate hinges and swing geometry for binding
- Plan for a larger mechanical alignment check after installation
Professional Advisory
A frame replacement can involve disassembling major operator components. Have a qualified gate technician perform the repair if the operator has structural damage or electrical components must be removed.
Product Questions and Answers
What operator is 73-18457 commonly used on?
It is commonly listed as a frame assembly for the LiftMaster SW490 swing gate operator.
Is this a cover or cosmetic part?
No. It is a structural frame assembly, not just an outer cover.
Can it be used on an LA400 or LA500?
No. It should not be used on LA400 or LA500 actuator-style swing gate operators.
Why should gate alignment be checked?
Frame damage is often caused by impact, binding, or mounting stress. The gate should be inspected so the replacement frame is not damaged again.
Does the parts diagram matter?
Yes. The parts diagram is the best way to confirm the correct frame assembly for the operator generation.
