LiftMaster K74-18379 Hall Effect Sensor Kit for Slide Gate Operators
The LiftMaster K74-18379 is a replacement Hall Effect Sensor Kit for select LiftMaster slide gate operators. A hall effect sensor is used to monitor motor or drive movement electronically so the control board can detect movement feedback during gate operation. On compatible slide operators, a failed or disconnected hall sensor can cause fault behavior, interrupted movement, failure to run correctly, or inaccurate movement detection.
This kit is used on specific LiftMaster slide gate operator generations and must be matched to the operator control board, wiring harness, and sensor location. It is commonly referenced with older SL540, SL570, SL580, SL575, and SL585 style GL-board slide gate operators, with sources also associating it with SL575GL, SL585GL, and SL595GL references. Some references caution that certain short-lead versions do not fit all SL590 or SL595 applications, so the parts diagram and original harness length should be checked closely.
What This Part Does
The K74-18379 supports the operator system by servicing the hall effect sensor kit area of the equipment. In the field, this type of replacement part is normally considered when the original component is worn, damaged, missing, electrically failed, mechanically loose, or no longer matching the required operator function. Because these parts are used on commercial and perimeter access systems, the exact fit can depend on model family, horsepower, voltage, control generation, enclosure style, and the original parts diagram.
Compatible With
The K74-18379 is commonly associated with Select LiftMaster SL540, SL570, SL575, SL580, SL585, SL585GL, SL575GL, and related slide gate operators with matching GL board sensor configuration. Compatibility should be confirmed by model number, original part number, component layout, and the manufacturer parts diagram, especially where several similar LiftMaster parts exist for nearby models.
Common Compatible Products and Applications
- Select LiftMaster SL540 slide gate operators with compatible GL board sensor setup
- Select LiftMaster SL570 slide gate operators with compatible GL board sensor setup
- Select LiftMaster SL575 and SL575GL slide gate operators
- Select LiftMaster SL580 slide gate operators with compatible GL board sensor setup
- Select LiftMaster SL585 and SL585GL slide gate operators
- Select LiftMaster SL595GL references when the harness length and parts diagram match
- LiftMaster slide gate operators where the parts diagram lists K74-18379, G74G0487, or K74-G0487-M
Compatibility Notes
- Use with select applications only; do not treat this as a universal LiftMaster replacement part.
- Match the operator model, horsepower or voltage where applicable, and the original part number before ordering.
- Similar-looking LiftMaster parts may use different connectors, shafts, mounting holes, cabinet locks, switch layouts, or electrical ratings.
- For commercial door and gate operators, confirm safety devices and operator operation after repair before returning the system to service.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Hall effect sensor kit |
| Part Number | K74-18379 |
| Application | Movement feedback sensor replacement for select slide gate operators |
| Compatible Operator Type | Select LiftMaster commercial slide gate operators |
| Common Operator Families | SL540, SL570, SL575, SL580, SL585, and related GL-board slide operators where confirmed |
| Included Components | Hall sensor assembly, wiring lead/harness, and mounting hardware where supplied |
| Notes | Confirm board generation, harness length, and parts diagram before ordering |
Also Known As / Related Part Numbers
This part may be searched by several LiftMaster, distributor, or component-reference numbers. Related numbers are included to help with identification, but they should not be treated as guaranteed replacements unless the operator parts diagram confirms the match.
- K74-18379
- LM-K74-18379
- G74G0487
- K74-G0487-M
- Hall effect assembly
- LiftMaster hall effect sensor kit
- SL575 hall sensor
- SL585 hall sensor
- GL board hall sensor
Technician Note
Before replacing the K74-18379, compare the original part label, mounting style, wiring or shaft layout, operator model, and parts breakdown. Commercial LiftMaster parts often share similar names but differ by horsepower, voltage, phase, logic generation, operator family, or cabinet design. If the failure involved binding hardware, damaged wiring, water intrusion, overheated components, or repeated faults, correct the cause before installing the replacement part.
Before Ordering, Confirm
- Original part number or related number on the failed component
- Exact LiftMaster operator model and product family
- Voltage, phase, horsepower, or logic generation when applicable
- Mounting style, connector layout, shaft size, switch layout, or cabinet lock style
- Parts diagram match for the specific operator version
- That the door or gate moves freely and the operator is not being overloaded
Professional Advisory
Commercial gate and door operator repairs should be performed with power disconnected and with the moving door or gate secured as required. Electrical components, brake circuits, control boards, and high-voltage motor circuits should be serviced by a qualified gate or door technician. Do not bypass monitored entrapment protection, limit switches, interlocks, or safety devices to force operation after a part replacement.
Important Ordering Warnings
- Do not order by appearance alone.
- Do not assume related part numbers are interchangeable without checking the parts diagram.
- Voltage, phase, horsepower, and logic generation must match where applicable.
- Limit, brake, control, and safety-related parts must be tested after installation.
Questions & Answers
What does the K74-18379 hall effect sensor do?
It provides movement feedback to the compatible slide gate operator control board so the board can monitor drive movement.
Which slide operators commonly use this kit?
It is commonly associated with select LiftMaster SL540, SL570, SL575, SL580, and SL585 style GL-board slide gate operators.
Will this fit SL590 or SL595 operators?
Some references include SL595GL while others caution about lead length or configuration. Verify the exact operator parts diagram and original sensor harness before ordering.
What symptoms can a bad hall sensor cause?
A bad hall sensor can cause movement faults, interrupted operation, failed run cycles, or control-board feedback errors on compatible operators.
What should be checked before replacement?
Check the board generation, sensor wiring, harness length, mounting position, and any fault codes before replacing the sensor.
