Security Parts carries parts for the LCN Benchmark 9130, 9140, and 9150 Series and the Senior Swing 9500 and 2800 Series automatic door operators. The Benchmark is low-to-medium duty with a 200-pound door capacity. The Senior Swing is the heaviest-duty version, rated for doors up to 600 pounds. The 9500IQ and 2800IQ Senior Swing generation adds AdaptivIQ self-calibrating technology that eliminates seasonal manual adjustments. Both lines use Push N Go non-switch activation that triggers when a person manually opens the door to 5 degrees. During power failure, both act as manual closers and do not block egress. All three Benchmark models use the same installation manual (740158). The 9500 is surface mounted; the 2800 is overhead concealed.

LCN automatic door operators are on more commercial entrances, healthcare corridors, and accessibility-required openings in North America than any other low-energy electromechanical operator brand. The Benchmark and Senior Swing lines cover the full range from budget-conscious retrofits through high-abuse institutional applications. When one fails or needs a component replacement, identifying the correct series, mounting configuration, and generation is the only way to order the right part without a return.

Browse the complete LCN parts catalog at SecurityParts.com, covering all LCN automatic operator and door closer product lines. For the full range of LCN door closer and automatic operator parts including the 4040XP, 4000 Series, Benchmark, and Senior Swing, browse the commercial door closer parts catalog.

What LCN Automatic Door Operators Do and Why They Exist

LCN automatic door operators are low-energy electromechanical swing door operators. They are distinct from full-power high-energy automatic door systems (the kind that open from a distance without any manual contact) and distinct from manual door closers (the hydraulic units that simply return a door to the closed position).

The specific application a low-energy operator fills is a door that is primarily intended for automatic use by people who cannot easily open a manual door, combined with the ability to be pushed open manually by regular pedestrian traffic. This two-in-one capability is what the ADA requires for accessible entrances where not every user needs automatic operation but where those who do cannot be expected to push a button or operate a separate actuator every time.

The code standard that governs these operators is ANSI/BHMA A156.19 (Power Assist and Low Energy Power Operated Doors). Both the Benchmark and Senior Swing series are certified to A156.19 and to ANSI A117.1 (Accessible and Usable Buildings and Facilities). UL listing is standard on both series.

LCN Benchmark Series 9130 9140 9150: What Each Number Means

All three Benchmark models share installation manual number 740158. If a technician has the manual for any one of the three models, it covers all three. The gear box part numbers in the LCN parts manual are series-specific, but the installation procedure is shared across the Benchmark family.

How the Benchmark 9130 9140 9150 Work: Key Features

Push N Go Non-Switch Activation

Push N Go is the feature that makes LCN Benchmark operators function without a separate wall-mounted push button for every passage. When a user manually pushes or pulls the door to approximately 5 degrees of opening angle, the operator's internal sensor detects the movement and the operator takes over, continuing to open the door fully and automatically.

After reaching full open, the door holds open for 1 to 30 seconds depending on the time delay adjustment, then closes automatically under spring force. The Push N Go feature means the door behaves exactly like a manual door for regular traffic (anyone can push it open normally) but automatically assists as soon as manual movement is detected, making it accessible without requiring button actuation from anyone in the traffic stream.

Power Boost Wind Compensation

The Benchmark includes a Power Boost function that provides additional closing force when the door is fighting wind resistance during the closing cycle. On exterior doors exposed to prevailing winds, a door closer set for normal closing speed may not fully close and latch the door during windy conditions. Power Boost detects when the closing cycle is being impeded and adds motor-driven closing force to ensure the door fully latches on every cycle. This is a passive feature that operates automatically without any adjustment.

Obstruction Reversal Safety

If the door contacts an obstruction during the closing cycle before reaching the latch position, the operator reverses direction and re-opens the door. This is a required safety function under ANSI/BHMA A156.19 for low-energy power-operated doors. The obstruction reversal prevents the door from closing on a person or wheelchair during the automatic closing sequence.

Power Failure Manual Operation

When power is lost, the Benchmark operator allows the door to be operated manually as a standard door. The operator does not lock the door or prevent movement during a power failure. This is a non-negotiable life safety requirement for any automatic door operator on a means of egress: power failure cannot result in a blocked exit.

LCN Senior Swing 9500 and 2800 Series: The Heavy-Duty Line

The Senior Swing is LCN's highest-duty automatic door operator line. Where the Benchmark is designed for low-to-medium traffic doors up to 200 pounds, the Senior Swing is built for high-abuse, high-traffic commercial applications with doors up to 600 pounds. Healthcare main entrances, hospital corridor fire doors, school main entries, and heavy hollow metal exterior doors in institutional applications are the typical Senior Swing specification environments.

Senior Swing Mounting Configurations

9500IQ and 2800IQ: The AdaptivIQ Generation

The current IQ generation of the Senior Swing adds AdaptivIQ self-calibrating technology. This is the most significant engineering advancement in LCN automatic door operator design in recent years and it addresses the most common complaint facilities managers have about automatic door operators in any brand: seasonal adjustment calls.

External conditions that affect an automatic door operator's performance change throughout the year. Wind pressure changes by season and weather event. HVAC stack pressure (the pressure differential between inside and outside created by building HVAC systems) reverses direction between summer and winter in most commercial buildings, which directly affects how hard the door operator must work to close against or with the pressure. Carpet compression, weather stripping condition, and door weight all vary. On conventional operators, each of these changes may require a field visit to adjust closing speed, hold-open time, or sensitivity settings.

AdaptivIQ continuously monitors door performance and adjusts operator parameters automatically to maintain consistent operation despite these changing external conditions. The result is fewer seasonal adjustment calls, more consistent operation across all weather conditions, and reduced total service cost over the operator's life cycle.

Senior Swing Power Failure Mode

Like the Benchmark, the Senior Swing acts as a manual door closer during a power failure. The LCN documentation specifically states it acts as a size 3 manual door closer when power is lost. The activating circuit opens the door from any position in the closing swing, meaning a partially closed door can still be manually opened during a power failure. This fail-safe design is required for egress compliance on any door on a means of egress.

Access Control Integration: The 1-Second Delay Feature

The Senior Swing includes a 1-second time delay between the activation signal from an access control system and the door beginning to open. This delay is a designed feature, not a malfunction. Its purpose is to allow enough time for an electrically controlled latch or electric strike to fully disengage before the operator begins pulling the door open. Without this delay, the operator would attempt to force the door open before the electric lock has released, either damaging the lock mechanism or failing to open the door completely.

This integration delay is one of the most frequently misdiagnosed behaviors on Senior Swing installations. When a facility first integrates an access control credential reader with a Senior Swing operator, the 1-second gap between credential read and door movement is sometimes reported as an operator malfunction by staff who expect immediate opening. The behavior is correct and intentional. Browse electric strike parts at SecurityParts.com for Von Duprin and Schlage electric strike components compatible with Senior Swing integrated openings.

Benchmark vs Senior Swing: Choosing the Right Operator

What Fails First on LCN Automatic Operators

Field service experience across Benchmark and Senior Swing installations reveals a consistent failure sequence. Knowing this before diagnosing saves time by directing attention to the most likely cause first.

1. Arm Assembly

The arm is the mechanical linkage between the operator unit and the door. It takes direct physical punishment every time the door opens and closes, including impact from carts, gurneys, wheelchair footrests, and manual push force. Bent, cracked, or loose arm assemblies are the most common physical failure on both Benchmark and Senior Swing operators. The arm type (single lever track for 9130, double lever for 9140, offset arm for Senior Swing) must be confirmed before ordering a replacement, as arms are configuration-specific.

For the Benchmark, the arm is a single replaceable component. For the Senior Swing, the arm assembly includes the arm, header plate, and connecting hardware. Always confirm the handing (right hand or left hand) and the mounting configuration (push or pull side) when ordering any arm assembly.

2. Gear Box Assembly

The gear box is the electromechanical drive mechanism that converts motor rotation into door movement. Gear box failure presents as a door that does not open when activated (motor runs but door does not move), a door that opens slowly and incompletely (stripped gears), or grinding noise during operation (gear wear). The gear box is a complete replacement assembly on both Benchmark and Senior Swing.

The LCN parts manual lists gear box assemblies by series number. Part numbers in the manual are 9130-3462SC (9130 Series gear box), 9140-3462SC (9140 Series gear box), and 9150-3462SC (9150 Series gear box). For Senior Swing, gear box part numbers are series-specific and documented in the separate Senior Swing parts section of the LCN Parts Manual. Always have the exact model number (including the series number and any suffix letters from the operator label) before ordering any gear box.

3. Control Board

The electronic control board manages all operator timing: hold-open delay, opening speed, closing speed, obstruction reversal, Push N Go sensing, and Power Boost. Control board failure presents as erratic behavior (door opens inconsistently, holds open indefinitely, or refuses to activate) after all mechanical components and power supply have been confirmed functional.

Before diagnosing a control board failure, confirm the power supply is correct (115VAC, single phase, 60Hz, fused at 15 amps), the arm is correctly connected, and the settings have not been inadvertently reset. A control board that has been reset to factory defaults by a power interruption may appear to have failed when it is actually operating correctly at its default settings, which differ from the field-adjusted settings that were in place before the power event.

4. Activator and Push Button Wiring

The wall-mounted push button actuator or access control signal wire is the most overlooked failure point on automatic door operators. A door that does not respond to button activation but opens correctly on Push N Go is almost always an actuator or wiring problem, not an operator failure. Check for loose wiring connections at the operator terminal block before assuming the operator has failed. On exterior installations, weather-related corrosion at the actuator wiring terminals is the single most common cause of button-activation failure that appears as operator failure.

5. Power Supply and Circuit

Both the Benchmark and Senior Swing require 115VAC, single phase, 60Hz power on a fused 15-amp circuit. A tripped circuit breaker is the most common cause of a completely non-responsive operator. Before any component diagnosis, confirm power at the operator terminal block with a voltage meter. The 15-amp circuit requirement is frequently violated in retrofit installations where the operator is connected to an existing circuit without verifying the available amperage. An undersized circuit produces intermittent operation as the circuit trips under the operator's starting current draw.

Adjustments and Settings: What Can Be Set in the Field

Both the Benchmark and Senior Swing support field adjustment of several operational parameters without requiring component replacement.

Hold-open time delay: Adjustable from 1 to 30 seconds on both series. This is the time the door remains fully open before beginning the closing cycle. For accessible routes, a minimum hold-open time that allows a wheelchair user to fully pass through before closing begins is required by ADA. The specific required time depends on the door width and the expected rate of passage for the building's user population.

Opening speed: The speed at which the operator drives the door from closed to full open. ANSI/BHMA A156.19 requires that low-energy operators open the door at a speed that does not create a hazard. An operator set to open too quickly can strike a person on the push side of an inswing door. Correct opening speed setting is a safety adjustment, not a preference adjustment.

Closing speed: The speed at which the door closes from the full open position to the latched position. This setting must balance between closing slowly enough to allow full passage time and closing quickly enough to latch before the next person activates the door.

Back check speed: On the Senior Swing, back check speed controls the door speed as it approaches the full open position, preventing the door from slamming into the stop at full opening. Incorrect back check speed setting causes repeated hard impacts between the door and door stop, which accelerates arm and door wear.

On the Senior Swing IQ generation, all speed and timing settings are stored in the controller's digital memory. Field adjustments replace the previous field settings in memory. The original factory defaults are always retained separately and can be recalled at any time, which is the basis of the factory default restore diagnostic described above.

How to Identify Your LCN Automatic Operator for Parts Ordering

Three pieces of information are needed before any LCN automatic operator parts order.

1. Model number: The model number is on a label on the operator housing. For mechanical products, the month and year of manufacture is also stamped near the packing nut at the base of the pinion where the arm attaches. For automatic operators, the label has the date of manufacture. The model number includes the series (9130, 9140, 9150, 9530, 9540, etc.) and any suffix letters that indicate handing, arm configuration, or generation (IQ suffix for the current AdaptivIQ Senior Swing generation).

2. Handing: Right hand (RH) or left hand (LH). Handing is determined by standing on the pull side of the door and noting which side the hinge is on. Right hand means the hinge is on the right. Left hand means the hinge is on the left. Arm assemblies and some mounting hardware are handing-specific.

3. Component failed: Arm assembly (mechanical linkage), gear box (electromechanical drive), control board (electronic controller), or activator/wiring (push button or access control wiring). The failure symptom determines which component to order. A door that does not move when activated but shows power at the terminal block points to the arm connection or gear box. A door that activates but behaves erratically points to the control board. A door that is completely unresponsive points to the power supply or activator wiring.

Browse the complete LCN parts catalog at SecurityParts.com for all Benchmark and Senior Swing components with series-specific diagrams. For the full LCN door closer and operator range including the 4040XP and 4000 Series surface closers and the 4630/4640 Auto Equalizer operators, browse the commercial door closer parts catalog. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at Security Parts

LCN automatic door operators are part of a complete door system that typically includes an electric strike or magnetic lock for access control, a door closer for fire-rated applications, and sometimes exit device hardware on egress doors. SecurityParts.com stocks all of these for a complete opening service call.

For Von Duprin electric strike parts on automatic operator openings with access control integration, browse the electric strikes catalog. For commercial exit alarm parts on automatic operator doors with alarm monitoring, browse the exit alarms catalog. For Von Duprin and Falcon exit device parts on automatic operator doors that also require panic hardware, browse the exit devices catalog. For Schlage ND Series cylindrical lock parts on adjacent doors in the same building, browse the cylindrical locks catalog. For Schlage L Series mortise lock parts on high-security entries in the same facility, browse the mortise locks catalog.

Browse the complete all products and parts catalog to source LCN, Schlage, Von Duprin, Falcon, and Detex hardware across the complete facility in a single session.