The LiftMaster K75-50189 is a replacement limit switch kit used on select LiftMaster swing gate perimeter access systems. The limit switch system helps the operator stop at the proper fully open and fully closed positions. On a swing gate operator, worn limit switches or damaged limit hardware can cause inconsistent stop points, over-travel, nuisance shutdowns, or gate movement that does not match the expected limits.
This kit is commonly referenced for LiftMaster swing gate applications and is associated with related numbers Q166, Q055, and Q165. It is often described for CSW-style swing gate operator use, but compatibility should be confirmed by the operator model, generation, and parts diagram. Limit assemblies for swing operators can differ by cabinet style, control board generation, and limit hardware layout.
The K75-50189 supports the operator system by servicing the limit switch 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.
The K75-50189 is commonly associated with Select LiftMaster swing gate perimeter access systems and CSW-style swing gate operators where Q166, Q055, or Q165 limit hardware is specified. 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.
| Feature / Specification | Details |
|---|---|
| Manufacturer | LiftMaster |
| Product Type | Limit switch kit |
| Part Number | K75-50189 |
| Application | Limit switch replacement for select swing gate operators |
| Compatible Operator Type | Select LiftMaster swing gate perimeter access systems |
| Common Related Numbers | Q166, Q055, Q165 |
| Notes | Match switch layout, operator family, and parts diagram before ordering |
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.
Before replacing the K75-50189, 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.
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.
It replaces the limit switch hardware on select LiftMaster swing gate operator and perimeter access systems.
K75-50189 is commonly associated with Q166, Q055, and Q165 references.
No. Swing gate limit hardware varies by operator family and generation, so the parts diagram should be checked.
It can cause over-travel, incorrect open or close stop points, repeated limit adjustments, or inconsistent gate travel.
Check the switch mounting, actuator/cam position, wiring, control board input, and gate travel before returning the operator to use.