LiftMaster K75-19104 Hall Effect Sensor Kit for HS670 Gate Operators
The K75-19104 is a Hall effect sensor replacement kit used on supported LiftMaster HS670 commercial and industrial gate operators. A Hall effect sensor is part of the feedback system that helps the operator detect motion or position information. When the sensor or its wiring becomes unreliable, the operator may show feedback-related faults, inconsistent behavior, or travel problems that cannot be corrected by mechanical adjustment alone.
This kit is most commonly considered during service calls where the operator has a known Hall sensor failure, damaged sensor wiring, intermittent motion feedback, or a parts diagram that calls out K75-19104. Before replacing the sensor, the technician should also inspect wiring connections, control board inputs, magnet or target alignment where applicable, and mechanical gate movement.
Compatible With
Supported references identify this kit for LiftMaster HS670 gate operator applications, with broader listings describing various LiftMaster residential and commercial gate operators only where the parts diagram confirms it.
- LiftMaster HS670 commercial gate operators
- LiftMaster HS670 industrial gate operators
- HS670GL / HS670 series units where the parts breakdown lists K75-19104
- Other LiftMaster gate operators only when the model-specific parts diagram identifies K75-19104
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Hall effect sensor kit |
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| Part Number | K75-19104 |
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| Application | Motion / position feedback sensing |
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| Compatible Operator Type | HS670 commercial / industrial gate operators |
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| Electrical Role | Feedback signal to operator control logic |
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| Notes | Wiring and sensor alignment should be checked during service |
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Also Known As / Related Part Numbers
- K75-19104
- 75-19104
- LM-K75-19104
- Hall Effect Sensor Kit
- Hall Effect Assembly
- HS670 hall sensor
Technician Note
A sensor fault should be diagnosed, not guessed. Check wiring, connector condition, sensor mounting, target alignment, and control board input condition before replacing parts.
Before Ordering
- Confirm the operator parts diagram lists K75-19104
- Inspect wiring and connectors for corrosion or damage
- Check for mechanical binding that may look like a sensor issue
- Verify the sensor mount and target alignment where applicable
- Do not bypass monitored safety or required entrapment protection during troubleshooting
Professional Advisory
Electrical feedback circuits are part of the operator control system. If the operator is moving unpredictably or reporting repeated feedback faults, a qualified gate technician should diagnose the unit before it is placed back in service.
Important Ordering Warning
Hall effect sensor issues can be caused by wiring, board, alignment, or mechanical problems. Replacing the sensor alone may not correct every fault.
Product Questions and Answers
What does the K75-19104 Hall effect sensor do?
It provides motion or position feedback to the HS670 operator control system so gate movement can be monitored correctly.
Is K75-19104 only for HS670 operators?
The strongest supported listing is HS670. Other LiftMaster gate operators should only be included if their parts diagram lists K75-19104.
What symptoms can point to a failed Hall effect sensor?
Intermittent movement feedback, feedback-related faults, erratic operation, or inconsistent travel response can point to sensor or wiring issues.
Should wiring be checked before replacing this kit?
Yes. Corroded terminals, broken wires, loose connectors, or poor sensor alignment can create symptoms similar to a bad sensor.
Can safety devices be bypassed while testing this sensor?
No. Required entrapment protection and safety devices should not be bypassed. Use proper diagnostic procedures or a qualified technician.
