Liftmaster K77-36539 Output Shaft w/ Sprocket Kit

Output Shaft and Sprocket Kit for LiftMaster RSW & CSW Gate Operators

The LiftMaster K77-36539 is a genuine output shaft and sprocket replacement kit, designed for use with LiftMaster swing gate operators including RSW12U, RSW12UL, CSW24U, and CSW24UL models. This kit includes the complete output shaft assembly along with a #35 limit switch chain, sprockets, couplers, and related hardware—everything needed to restore precise motion control between the motor and gate arm mechanism.

Whether you're addressing wear, slippage, or failure at the drive output, the K77-36539 offers a direct OEM replacement with properly matched components for reliable operation.

Please consult your operator manual or parts diagram to confirm compatibility before ordering.

Key Features

• Complete output shaft assembly – Includes shaft, sprockets, washers, and couplers
• OEM replacement kit – Built specifically for LiftMaster swing gate operators
• Restores smooth mechanical drive – Ensures proper torque transfer and chain tension
• Includes #35 chain for limit switch – Supports accurate gate position sensing
• Compatible with multiple models – Works with both RSW and CSW series

Technical Specifications

• Part Number: K77-36539
• Component Type: Output shaft and sprocket assembly
• Chain Type: #35 limit switch chain
• Included: Shaft, large and small sprockets, chain, hardware, washer, and coupler
• Compatible Models: LiftMaster RSW12U, RSW12UL, CSW24U, CSW24UL
• Installation: OEM replacement; fits directly into gear housing assembly

Conclusion

The LiftMaster K77-36539 Output Shaft and Sprocket Kit offers a reliable, factory-grade solution for maintaining torque transfer and limit control in swing gate systems. Designed to fit multiple UL-listed LiftMaster operators, this kit ensures continued gate functionality with smooth, secure drive engagement.