LiftMaster LA500 Primary Arm – 24VDC Replacement Linear Actuator (Arm Only)
The LiftMaster LA500 Primary Arm is the genuine OEM replacement linear actuator arm for LA500 single swing gate operators. This is the arm only — it does not include the control box, receiver, batteries, or safety sensors.
Ideal for replacing a failed or worn-out actuator on an existing LA500 system without buying a complete new operator kit. Saves significant time and cost for installers and property owners.
Need the complete operator? See the LA500 single-gate kit or the LA500 dual-gate kit.
Key Features
- 24VDC linear actuator – smooth, quiet soft start and stop operation
- Designed specifically for LiftMaster LA500 gate systems
- Includes 6 ft pre-wired cable
- MyQ® compatible when paired with a compatible LA500 control board
- Heavy-duty construction for residential and light commercial use
- Commercial-duty performance for larger gates, up to 18 ft or 1,200 lbs
What's Included
- LA500 primary actuator arm
- 6 ft cable
Important: This is a replacement arm only. A working LA500 control box and receiver are required for operation.
Which Part Do I Need?
| Your situation | Order this |
|---|---|
| Replacing the arm on a single gate | This arm — LA500DC primary |
| Replacing the second arm on a dual gate | LA500DCS secondary arm |
| Adding a second leaf to a single system | LA500DCS secondary arm |
| Control box has failed as well | LA500PKGUL complete kit |
| Gate is under 850 lbs and 16 ft | The lighter LA400DC arm may suit |
Compatibility
Designed for:
- LiftMaster LA500 single swing gate operators
- LA500PKGUL and LA500PKGULMC complete operator kits
- Existing LA500 installations needing arm replacement
Note: For dual-gate systems you need one primary arm (this model) plus one LA500DCS secondary arm.
Manuals & Parts
Download the LA500 Installation Manual (PDF) — mounting, wiring, programming and the complete error code list.
All LiftMaster gate operator parts
LiftMaster LA500 Error Codes & Troubleshooting
Quick reference for the most common diagnostic codes when troubleshooting the LA500 system. Codes 32, 33, 91, 92, 93 and 94 usually point at the arm rather than the board.
| Code | Description / Solution |
|---|---|
| 31 | Control board failure – disconnect power for 15 seconds and reboot; replace the board if it persists |
| 32 / 33 | Linear drive disengaged, Arm 1 / Arm 2 – re-engage the arm and check wiring |
| 34 | Absolute position encoder error – check the cable and reprogram the limits |
| 35 | Max run time exceeded – check for an obstruction and reprogram the limits |
| 38 / 39 | Hard stop limit – limit set too tight or the arm is at end of travel; re-adjust |
| 51 / 52 | Pass-point not detected – check the yellow pass-point wiring and reprogram limits |
| 60 | Minimum monitored entrapment devices not installed |
| 91 / 92 | Force reversal – check for an obstruction or mechanical binding |
| 93 / 94 | RPM or stall reversal – check wiring and arm engagement; a failing arm often shows here |
| 99 | Normal operation |
The complete error code list and detailed troubleshooting is in the official manual linked above.
Why Choose the LA500 Primary Replacement Arm?
- Cost-effective way to repair instead of replacing the entire operator
- Direct OEM fit – no modifications required
- Restores smooth, quiet and powerful gate operation
- Ideal for service professionals and gate companies
- Extends the life of your existing LA500 system
Product Summary
LiftMaster LA500 Primary Arm – official 24VDC replacement linear actuator arm, arm only, for LA500 single swing gate operators. Includes a 6 ft cable, MyQ compatible. The fastest and most
