LiftMaster LA400PKGUL and LA400DCS Dual Swing Gate Operator Technical Details
The LiftMaster LA400UL dual swing gate operator package is designed for residential vehicular gates with two powered swing leaves. This configuration combines the LA400PKGUL primary single-arm operator package with the LA400DCS secondary 24VDC linear actuator for the second gate leaf.
LiftMaster identifies LA400PKGUL as the single-arm package, LA400DC as the primary actuator, and LA400DCS as the secondary actuator for dual swing gate applications. These part numbers are related but should not be treated as the same component when ordering replacement parts or building a complete operator system.
What This LA400 Dual Gate System Does
The LA400UL uses 24VDC linear actuators to automate properly constructed residential vehicular swing gates. The system provides smooth start/stop operation, electronic limits, battery backup, Security+ 2.0 radio technology, solar capability, monitored entrapment protection inputs, and support for compatible LiftMaster access-control and myQ equipment.
For a dual gate, the primary and secondary actuators operate the two gate leaves in a coordinated system. Proper actuator mounting geometry, gate stops, wiring, limits, safety devices, and gate condition are critical to reliable operation.
Dual Package Configuration
- LiftMaster LA400PKGUL primary single-arm operator package
- LA400DC primary 24VDC linear actuator
- LA400CONTUL standard control box commonly associated with the LA400PKGUL
- Two 7Ah batteries commonly supplied in the standard LA400 control box
- LMRRUL monitored retro-reflective photo eye associated with the current LA400UL package
- LA400DCS secondary 24VDC actuator for the second gate leaf
- Secondary actuator hardware, junction box, and connecting cable commonly associated with the LA400DCS kit
Package-content warning: Dual operator packages may be assembled from separate LiftMaster components. Confirm the exact contents of this Gate Openers Unlimited package if a specific cable length, bracket, junction box, battery, reflector, remote control, solar component, or additional safety device is required.
Compatible With
- LiftMaster LA400UL residential swing gate operator systems
- LA400PKGUL primary single-arm operator packages
- LA400DC primary actuator applications
- LA400DCS secondary actuator applications
- Dual-leaf residential vehicular swing gates within the published LA400 capacity chart
- Compatible LiftMaster Security+ 2.0 controls
- Compatible LiftMaster myQ equipment and services when the required connectivity hardware is installed
- Class I, II, and III vehicular swing gate applications as specified in current LA400UL installation documentation
Gate Length and Weight Capacity
The LA400UL should not be selected by maximum gate weight or maximum gate length alone. LiftMaster specifies a decreasing allowable gate weight as gate-leaf length increases. For a dual gate, each leaf should be checked separately.
| Gate Leaf Length | Recommended Maximum Weight Per Leaf |
| 10 ft | 850 lb |
| 12 ft | 750 lb |
| 14 ft | 650 lb |
| 16 ft | 550 lb |
Gate suitability can also be affected by wind loading, solid gate surfaces, hinge condition, gate balance, mounting geometry, post construction, frequency of use, and environmental conditions.
Features and Specifications
| Manufacturer | LiftMaster |
| Operator Family | LA400UL |
| Primary Package | LA400PKGUL |
| Primary Actuator | LA400DC |
| Secondary Actuator | LA400DCS |
| Application | Dual residential vehicular swing gate |
| System Operating Voltage | 24VDC |
| Main AC Supply | 120VAC, 0.5A standard configuration |
| Accessory Power | 24VDC, 500mA maximum |
| Maximum Daily Cycle Rate | 100 cycles per day |
| 90-Degree Travel Time | Approximately 15-18 seconds depending on mounting geometry |
| Maximum Travel Range | Approximately 115 degrees depending on mounting geometry |
| Battery Backup | Yes |
| Standard Batteries | Two 7Ah batteries commonly supplied with standard control box |
| Solar Capability | Yes, with properly selected LiftMaster solar equipment |
| Solar Power Maximum | 24VDC at 60 watts maximum |
| Radio Technology | Security+ 2.0 |
| Connectivity | myQ compatible with supported connectivity equipment and services |
| Operating Temperature | -4 F to 140 F |
| Usage Classification | Class I, II, and III vehicular swing gates |
| Operator Warranty | 2 years |
LA400PKGUL vs. LA400DC vs. LA400DCS
- LA400PKGUL: Primary single-arm LA400UL operator package.
- LA400DC: Primary 24VDC actuator arm used with the LA400 system.
- LA400DCS: Secondary 24VDC actuator specifically intended for dual swing gate applications.
- LA400CONTUL: Standard control box associated with the LA400UL platform.
A customer replacing only an actuator should verify whether the existing part is the primary LA400DC or secondary LA400DCS before ordering.
Similar Parts That Are Not Automatically Interchangeable
Do not substitute LA412, LA412DC, LA412DCS, LA500DC, or LA500DCS actuators simply because they are LiftMaster linear swing gate operators. Voltage, control-system requirements, actuator characteristics, mounting, battery systems, and intended gate capacities can differ.
Older LA400, LA400PKGU, control-board, control-box, and accessory generations should also be verified by model number, production date, wiring, connector configuration, and current replacement-parts documentation before substitution.
Also Known As / Related Part Numbers
- LA400UL
- LA400PKGUL
- LA400DC
- LA400DCS
- LA400CONTUL
- LA400
- LA400PKGU - earlier package designation commonly associated with previous LA400 documentation
Related part numbers may identify individual components, previous package designations, or different configurations. They are not automatically complete replacements for one another.
Safety and Entrapment Protection
The LA400UL is intended for vehicular passage gates and is not intended for pedestrian gate applications. LiftMaster requires approved external monitored entrapment protection devices in applicable entrapment zones. The number and type of required devices depends on the physical gate installation.
An included LMRRUL photo eye does not automatically provide complete entrapment protection for every dual swing gate. Additional monitored photo eyes or monitored edge sensors may be required after the installation is evaluated.
Never bypass monitored photo eyes, safety edges, obstruction sensing, emergency access equipment, or other operator safety circuits to make the gate run.
Technician Note
Before installing either actuator, disconnect the operators and confirm that both gate leaves move smoothly through their complete travel by hand. Binding hinges, damaged posts, poor gate balance, incorrect bracket setback, excessive wind loading, and missing physical stops can cause obstruction faults, inconsistent operation, or premature actuator wear.
Dual gates also require careful setup when one leaf overlaps the other. The operator configuration and gate geometry must allow the leaves to open and close in the proper sequence without contacting each other.
Before Ordering Checklist
- Confirm the installation has two vehicular swing gate leaves.
- Measure the length of each gate leaf.
- Determine the approximate weight of each gate leaf.
- Compare each leaf with the LiftMaster LA400 capacity chart.
- Confirm the package includes LA400PKGUL plus LA400DCS for dual operation.
- Verify whether the installation will use AC or solar power.
- Check gate posts, hinges, physical stops, and actuator mounting geometry.
- Determine all required monitored photo eyes and/or monitored edge sensors.
- Verify accessory loads for locks, loops, access controls, intercoms, and other equipment.
- Confirm current package contents if a particular cable, junction box, battery, remote, or bracket is required.
Installation and Service Notes
This operator is intended to be installed and serviced by a trained gate systems technician. Installation includes mechanical gate geometry, actuator mounting, line-voltage supply, battery charging, low-voltage accessory wiring, limit programming, force settings, monitored safety inputs, and final entrapment-protection testing.
High-voltage electrical work, internal control-board diagnosis, battery charging faults, transformer problems, unsafe wiring, or unexplained safety-device faults should be handled by a qualified gate or access-control technician.
Product Questions & Answers
Is LA400PKGUL by itself a dual swing gate operator package?
No. LA400PKGUL is the LiftMaster LA400UL single-arm package. A conventional dual LA400 configuration adds the LA400DCS secondary 24VDC actuator for the second gate leaf.
What is the difference between LA400DC and LA400DCS?
LA400DC is the primary 24VDC actuator used with the LA400 system. LA400DCS is the secondary 24VDC actuator intended for the second leaf of a dual LA400 swing gate installation.
Can the LA400 operate a 16-foot gate weighing 850 pounds?
No. The maximum length and maximum weight are not simultaneous ratings. LiftMaster specifies approximately 850 lb at 10 ft, 750 lb at 12 ft, 650 lb at 14 ft, and 550 lb at 16 ft per gate leaf.
Does this LA400 dual package have battery backup?
Yes. The standard LA400UL system uses 24VDC battery operation and the standard LA400 control box is commonly supplied with two 7Ah batteries. Confirm current bundle contents before ordering if batteries are specifically required.
Does one LMRRUL photo eye provide all required gate safety protection?
Not necessarily. Required monitored entrapment protection depends on the gate layout and every identified entrapment zone. A dual swing installation may require additional monitored photo eyes or monitored edge sensors.
Can an LA412DCS or LA500DCS be substituted for an LA400DCS?
No. These secondary actuators belong to different LiftMaster operator families and should not be substituted without specific manufacturer documentation confirming the application. For an LA400 dual system, verify that the required secondary actuator is LA400DCS.
Can the LiftMaster LA400UL dual gate system operate from solar power?
Yes. The LA400UL supports properly designed solar installations, but solar panels, battery capacity, control enclosure, accessory load, and site sunlight conditions must be correctly sized. Solar equipment is not automatically included with the standard AC package.
What should be verified before ordering this LA400 dual operator package?
Verify the length and weight of both gate leaves, gate condition, hinge movement, mounting geometry, power source, primary and secondary actuator requirements, monitored entrapment protection, accessory loads, and the exact contents of the package being purchased.
