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.
Product Details
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.
Compatible With
This part is commonly associated with the following LiftMaster applications when the operator parts diagram calls for this exact service part:
- Various LiftMaster CSW series swing gate operators where K39-50229 or Q219 is listed
- LiftMaster CSW200 swing gate operators only when the parts diagram calls for Q219 / K39-50229
- LiftMaster CSW200U and CSW200UL style applications only when the installed clutch assembly matches this disc
- Select Elite CSW swing gate operator clutch assemblies that use the Q219 clutch disc
- Not a universal clutch disc for all LiftMaster slide gates, barrier gates, or commercial door operators
Features and Specifications
| 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 |
Also Known As / Related Part Numbers
- K39-50229
- 39-50229
- K3950229
- 3950229
- Q219
- LiftMaster Q219 clutch disc
- Elite Q219 clutch disc
- CSW clutch disc
Technician Note
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.
Before Ordering Checklist
- Confirm K39-50229 or Q219 appears in the operator parts breakdown
- Check whether the operator needs a loose disc or a complete clutch set
- Verify the CSW model and production generation
- Inspect clutch plates, springs, sprockets, and gate arm condition
- Test gate movement and safety devices after service
Professional Advisory
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.
Product Questions and Answers
What is Q219?
Q219 is a related LiftMaster/Elite reference for the K39-50229 clutch disc used in select CSW swing gate clutch assemblies.
Will K39-50229 fit all CSW200 operators?
No. It may be used with select CSW series operators only when the original parts diagram lists K39-50229 or Q219.
Is this a complete clutch set?
No. This listing is for the clutch disc. Some repairs may require additional clutch hardware or a complete clutch set.
What symptoms point to a worn clutch disc?
Common signs include slipping under load, squealing, erratic gate movement, or a clutch that cannot be adjusted consistently.
Can I use this on a slide gate operator?
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.
