Liftmaster K20-1050-1T, MOTOR, 1/2HP, 115V, 1PH, BM, TEFC
The LiftMaster K20-1050-1T is a 1/2 HP motor replacement kit for select 115V single-phase gate operator systems. The TEFC style helps protect the motor from normal airborne debris better than open designs, making it useful in gate operator cabinets exposed to outdoor environments. It is used where the operator drivetrain requires the matching horsepower, voltage, phase, shaft, and base-mount configuration.
This part is commonly referenced for select LiftMaster and legacy Elite swing and slide gate operators, with model references including SL3000 / SL3000UL and CSW200 / CSW200UL in some listings. Motor replacements must be ordered more carefully than many small parts because similar 1/2 HP motors can differ by voltage, phase, mounting base, shaft length, rotation, enclosure, and duty requirements.
Compatible With
- Select LiftMaster SL3000 Series slide gate operators requiring a 1/2 HP 115V 1-phase TEFC motor
- Select LiftMaster SL3000UL slide gate operators requiring this motor callout
- Select LiftMaster CSW200 Series swing gate operators requiring this motor callout
- Select LiftMaster CSW200UL swing gate operators requiring this motor callout
- Legacy Elite gate operator assemblies that use the matching 1/2 HP 115V 1-phase TEFC base-mount motor
- Various 1-phase residential and commercial swing gate / perimeter access systems where K20-1050-1T is shown in the parts diagram
Compatibility note: Match the motor nameplate and parts diagram. Do not rely on horsepower alone when replacing a gate operator motor.
Features and Specifications
| Manufacturer | LiftMaster |
| Product Type | Motor replacement kit |
| Part Number | K20-1050-1T |
| Horsepower | 1/2 HP |
| Voltage | 115V |
| Phase | 1-phase |
| Motor Style | Base mount, TEFC |
| Application | Select LiftMaster / Elite gate operators |
Also Known As / Related Part Numbers
- K20-1050-1T
- 20-1050-1T
- LM-K20-1050-1T
- LiftMaster 1/2HP 115V TEFC motor
- Elite 1/2HP TEFC motor reference
Technician Note
If the old motor is overheated, humming, tripping overloads, or stalling, inspect gate movement, gearbox condition, capacitors, overloads, and incoming voltage before replacing the motor.
Before Ordering Checklist
- Match horsepower, voltage, phase, and motor enclosure
- Compare shaft length, mounting base, and wiring leads
- Confirm the operator parts diagram calls for K20-1050-1T
- Check gate movement and drivetrain drag before installation
- Do not install on a different voltage or phase system
Professional Advisory
Motor replacement involves high-voltage wiring and moving equipment. A qualified gate technician should perform the installation and test the operator safety devices after service.
Product Questions and Answers
What does TEFC mean on this motor?
TEFC means totally enclosed fan cooled. It is a motor enclosure style used to help protect internal components while providing cooling.
Is this motor compatible with all 1/2 HP LiftMaster operators?
No. Horsepower is only one part of fitment. Voltage, phase, mounting, shaft, enclosure, and parts diagram must match.
Which models are commonly referenced?
Some listings associate this motor with SL3000 / SL3000UL and CSW200 / CSW200UL style gate operators, but diagram confirmation is still required.
What can cause a replacement motor to fail quickly?
A binding gate, worn gearbox, bad capacitor, incorrect voltage, overload issue, or water intrusion can damage a replacement motor.
Should the capacitor be replaced with the motor?
It depends on the operator and test results. The capacitor should be tested or replaced when readings are weak or symptoms point to capacitor failure.
