The travel nut on LA500DC and LA500DCS gate operators may break when excessive force is applied to the gate such as being struck from a vehicle.
The travel nut can be identified as the white plastic nut that attaches to the internal lead screw of the arm.
The symptom of this problem is that the trolley assembly slides back and forth along the guide slots without mechanical restraint.
LiftMaster has created Trolley Service Kit K75-39337 with all the necessary parts and provides instructions on how to replace a damaged travel nut
within an LA500 arm
Complete with: Clutch Plate Clutch Shaft Bearing 3/4' I.D. Sprocket 41B10x3/4' 5L Belt Motor Pulley Spring Clutch Disk Shim Washers Castle Nut Flatwashers Cotter Pin Roll Pins and Push on Fastener
Smooth Start/Stop Operation - New DC high-efficiency motor and gearbox provides the power needed and smooth start and stop to reduce wear-and-tear on your door and operator.
Faster Speed - Average of 12” per second opening on sectional doors.
Battery Backup Option - Provides seamless operation by supplying standby power when the power is down (battery backup sold separately)
Floor-Level Wall Controller - 4-line LCD display gives you access to programming troubleshooting and diagnostics at floor level saving time and money.
Wi-Fi® and myQ® - Easily connect to myQ Facility via Wi-Fi for visibility into what is happening at your door and control it from your web browser; no need for additional hubs or accessories.