The LiftMaster K39-50229 clutch disc, commonly referenced as Q219, is a replacement friction disc used in select LiftMaster and Elite CSW swing gate operator clutch assemblies. The disc helps the clutch transmit torque to the swing gate drive while providing a controlled slip point when adjusted correctly. It is usually ordered when the clutch is worn, glazed, slipping under load, or unable to hold proper adjustment.
This part belongs in the mechanical drive clutch area, not in the control board or limit circuit. A worn disc may show up as a motor that runs while the gate arm hesitates, a clutch that squeals or slips, or repeated adjustment problems. Because CSW operators have different clutch kits and production variations, the original parts breakdown should be checked before ordering this loose disc.
This part is commonly associated with the following LiftMaster applications when the operator parts diagram calls for this exact service part:
| Manufacturer | LiftMaster |
| Product Type | Clutch disc / friction disc |
| Part Number | K39-50229 |
| Related Reference | Q219 |
| Application | Select CSW swing gate operator clutch assemblies |
| Compatible Operator Type | Commercial swing gate operators |
| Notes | Verify CSW model, production generation, and clutch parts diagram |
Do not assume every CSW clutch component is interchangeable. Some CSW200 applications use complete clutch sets or different Q-number parts, so match the old part and parts diagram before replacing only the disc.
If the clutch is being tightened repeatedly to keep the gate moving, the gate may have a mechanical problem. A technician should inspect hinges, arm geometry, physical stops, and gate balance before returning the operator to service.
Q219 is a related LiftMaster/Elite reference for the K39-50229 clutch disc used in select CSW swing gate clutch assemblies.
No. It may be used with select CSW series operators only when the original parts diagram lists K39-50229 or Q219.
No. This listing is for the clutch disc. Some repairs may require additional clutch hardware or a complete clutch set.
Common signs include slipping under load, squealing, erratic gate movement, or a clutch that cannot be adjusted consistently.
Do not use it on a slide gate unless the exact operator parts diagram calls for K39-50229. It is commonly associated with CSW swing gate applications.