LiftMaster LA400DC Primary Arm – 24VDC Replacement Linear Actuator (Arm Only)
The LiftMaster LA400DC Primary Arm is the genuine OEM replacement linear actuator arm for LA400 single swing gate operators. This is the arm only — it does not include the control box, receiver, or safety sensors.
Ideal for replacing a failed or worn-out actuator on an existing LA400 system without buying a complete new operator kit. Saves time and money for installers and property owners.
Key Features
- 24VDC linear actuator – smooth, quiet soft start/stop operation
- Designed specifically for LiftMaster LA400 gate systems
- Includes 6 ft cable and basic mounting hardware kit (K77-19130)
- MyQ® compatible when paired with a compatible LA400 control board
- Durable construction for residential and light commercial use
- Updated modern design (new style since August 2014)
What's Included
- LA400DC primary actuator arm
- 6 ft pre-wired cable
- Basic mounting hardware kit (K77-19130)
Important: This is a replacement arm only. A working LA400 control box and receiver are required for operation.
Compatibility
Designed for:
- LiftMaster LA400 single swing gate operators
- LA400PKGUL / LA400UL complete operator kits
- Existing LA400 installations needing arm replacement
Note: For dual-gate systems you will need one primary arm (this model) + one secondary arm (LA400DCS).
Easy Installation & Manuals
Download LA400DC Installation Manual (PDF)
LiftMaster LA400 Error Codes & Troubleshooting
Quick reference for common diagnostic codes when troubleshooting the LA400 system:
| Code | Description / Solution |
|---|---|
| 31 | Main control board failure – reboot or replace board |
| 32/33 | Linear drive disengaged – re-engage arm and check wiring |
| 35 | Max run time exceeded – check for obstruction and reprogram limits |
| 60 | Minimum monitored entrapment devices not installed |
| 91/92 | Force reversal – check for obstruction or mechanical binding |
| 99 | Normal operation |
Full error code list and detailed troubleshooting is in the official manual linked above.
Why Choose the LA400DC Replacement Arm?
- Cost-effective way to repair instead of replacing the entire operator
- Direct OEM fit – no modifications required
- Restores smooth, quiet gate operation
- Ideal for service professionals and gate companies
- Extends the life of your existing LA400 system
Product Summary
LiftMaster LA400DC Primary Arm – official 24VDC replacement linear actuator arm (arm only) for LA400 single swing gate operators. Includes 6 ft cable and hardware. MyQ compatible. The fastest, most economical way to repair a failed LA400 gate arm.
![Liftmaster LA400CONTUL Complete control box and circuit board for LA400DCU [LA400CONTULMC]](https://cdn11.bigcommerce.com/s-32eq2wsbti/images/stencil/500x659/products/15253/226719/liftmaster-la400contul-complete-control-box-and-circuit-board-for-la400dcu-la400contulmc-la400contul__50052.1721406425.jpg?c=2 "Liftmaster LA400CONTUL Complete control box and circuit board for LA400DCU [LA400CONTULMC]")
