Liftmaster K75-18362, ARM ASSEMBLY KIT
The LiftMaster K75-18362 is a mechanical arm assembly kit for SW420 and SW420GL swing gate operators. The arm assembly is the linkage that converts the operator output into controlled gate movement. When this linkage is bent, badly worn, loose, or installed with incorrect geometry, the operator can bind, overtravel, hit the stops hard, or place extra load on the motor and gearbox.
This kit is not a universal swing gate arm. It is tied to the SW420/SW420GL operator platform and should be matched against the original arm and the parts diagram. If the old arm failed because the gate is sagging, hinges are tight, or the gate does not have proper physical stops, those problems should be corrected before the new arm is placed back into service.
Compatible With
- LiftMaster SW420 swing gate operators
- LiftMaster SW420GL swing gate operators
- SW420 series applications using the K75-18362 / 307-072703 arm assembly
- Not a confirmed substitute for SW470, SW490, LA400, LA412, LA500, or other linear actuator arms
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Arm assembly kit |
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| Part Number | K75-18362 |
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| Application | Mechanical arm linkage replacement |
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| Compatible Operator Type | LiftMaster SW420 and SW420GL swing gate operators |
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| Included Components | Arm assembly components as supplied by kit |
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| Notes | Confirm gate geometry, stops, hinges, and operator parts diagram |
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Also Known As / Related Part Numbers
- K75-18362
- 75-18362
- 307-072703
- 307072703
- 307072703R
- LM-K75-18362
- SW420 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 use K75-18362?
K75-18362 is commonly listed for LiftMaster SW420 and SW420GL swing gate operators.
What old part number is related to this kit?
The legacy related number commonly listed is 307-072703. Variations without the dash may also appear in searches.
Is this the same arm as K75-18364?
No. K75-18362 and K75-18364 are separate arm assembly kits. Match the operator model and parts diagram before ordering.
What symptoms point to a worn arm assembly?
Loose gate movement, binding, bent linkage, damaged pivots, or poor gate travel can point to arm assembly wear or damage.
What should be checked after installing the arm?
Check gate hinge movement, physical stops, limits, clutch/force settings where applicable, and all required entrapment protection devices.
