Liftmaster K75-18364, ARM ASSEMBLY KIT
The LiftMaster K75-18364 is a swing gate arm assembly kit for select LiftMaster commercial swing gate operators. The arm assembly is the working linkage between the operator and the moving gate leaf. A correct arm assembly helps maintain proper travel geometry, reduces binding, and protects the gearbox and drive components from unnecessary load.
References commonly list this kit for SW420GL and SW470 applications. Because several LiftMaster swing gate operators use related but different mechanical linkage parts, verify the model, arm layout, and parts diagram before ordering. If the operator has repeated arm damage, inspect for gate sag, missing stops, incorrect mounting geometry, wind loading, or a gate that is physically too heavy for the operator setup.
Compatible With
- LiftMaster SW420GL swing gate operators where the parts diagram calls for K75-18364
- LiftMaster SW470 swing gate operators where confirmed by parts diagram
- Select LiftMaster commercial swing gate arm assembly applications using K75-18364
- Not a confirmed substitute for K75-18362, SW490 drive assemblies, LA400 actuator parts, or LA500 arm parts
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Arm assembly kit |
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| Part Number | K75-18364 |
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| Application | Mechanical swing gate arm linkage replacement |
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| Compatible Operator Type | Select LiftMaster SW420GL and SW470 swing gate operators |
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| Notes | Verify operator model, arm geometry, and mounting hardware |
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Also Known As / Related Part Numbers
- K75-18364
- 75-18364
- LM-K75-18364
- SW420GL arm assembly kit
- SW470 arm assembly kit
Technician Note
Match this replacement part to the original part number, operator model, and parts diagram. LiftMaster and Elite service parts often look similar across operator families, but small differences in mounting, wiring, generation, voltage, or mechanical layout can make them non-interchangeable.
Before Ordering Checklist
- Confirm the operator model and model suffix on the nameplate.
- Compare the existing part number, Q number, or old reference number when available.
- Review the operator parts diagram for the exact assembly location.
- Check for damage that may have caused the original part to fail, such as water intrusion, gate binding, worn chain, loose hardware, or incorrect wiring.
- For electrical parts, confirm voltage, control-board generation, grounding, and accessory wiring before installation.
Professional Advisory
Gate operator repairs can involve heavy moving gates, stored mechanical force, high voltage, and required entrapment protection devices. Do not bypass safety sensors, edge devices, interlocks, or emergency release requirements. When wiring, grounding, high-voltage diagnosis, or unsafe gate movement is involved, have the system serviced by a qualified gate technician.
Product Questions and Answers
Which operators are commonly associated with K75-18364?
References commonly list SW420GL and SW470 swing gate operator applications, depending on the parts diagram.
Is K75-18364 the same as K75-18362?
No. They are separate arm assembly kits and should not be interchanged without parts-diagram confirmation.
Can a bent arm be straightened and reused?
A bent or twisted arm should generally be replaced. Straightening can weaken the arm and may not restore proper gate geometry.
Why does the gate geometry matter?
Incorrect geometry can cause binding, poor travel, hard stopping, or overload on the motor and gearbox.
What else should be inspected with a failed arm?
Inspect hinges, gate stops, mounting posts, operator foundation, brackets, and safety devices before returning the gate to service.
