Security Parts carries parts for the Von Duprin 75 and 78 Series pushpad devices (70 Series family), the 88 Series wide stile crossbar, the 94/95 INPACT recessed push pad series, and the 54 Series mullion line. The 75 is narrow stile; the 78 is wide stile. Both share the 70 Series QEL quiet electric latch option. The 88 Series crossbar tube (part 967738) is 42 inches and shared with the 55 Series, field-cut to size. The 88 lever arm is handed (050438 RH, 050439 LH); the dogging pin spring in the arm is a separate replaceable component. The INPACT 94/95 is a recessed push pad device for impact reduction. Mullion stabilizers (part 154) must be installed on every mullion to prevent security bypass via deflection.

Von Duprin's exit device catalog is broader than most facilities managers realize. Beyond the 98/99, 33A/35A, 22, and 55 Series covered elsewhere, there are four additional series that address specific application challenges: the 70 Series (75 narrow stile and 78 wide stile pushpad devices), the 88 Series (wide stile crossbar), the 94/95 INPACT Series (recessed push pad for impact-prone environments), and the 54 Series mullion line that enables rim devices on double-door openings.

Browse the complete Von Duprin parts catalog at SecurityParts.com for all series with interactive diagrams. For the full exit device catalog including Falcon alongside Von Duprin, browse the commercial exit devices catalog.

Von Duprin 70 Series: The 75 and 78 Pushpad Family

The Von Duprin 70 Series is the most recent generation of the Von Duprin pushpad exit device family, covering the 75 (narrow stile) and 78 (wide stile) models. These are positioned between the economy 22 Series and the premium 98/99 Series, offering heavy-duty construction for warehouse, industrial, office, multifamily, retail, and commercial real estate applications where the highest specification of the 98/99 is not required.

70 Series Quiet Electric Latch Retraction (QEL)

The QEL option is the most important specification detail on the 70 Series (75 and 78) and 94/95 INPACT Series. Standard electric latch retraction (EL) on Von Duprin devices uses a solenoid that produces a distinct mechanical click when the latch retracts. In healthcare corridors, educational facilities, and quiet institutional environments, this noise is a complaint trigger from clinical staff and building management.

The Quiet Electric Latch Retraction (QEL) addresses this by using a motorized, slower-action latch retraction mechanism that significantly reduces the noise of electric latch operation. The QEL is available on devices sold after October 2014 on new installations. For pre-October 2014 devices, modular conversion kits allow upgrading existing non-EL panic or fire-rated devices to QEL without replacing the entire exit device.

70 Series Electronic Options

The 70 Series (75 and 78) supports the following electronic options. These are specified at ordering time and are not field-added without conversion kits.

Von Duprin 88 Series: Wide Stile Crossbar Parts

The Von Duprin 88 Series is a wide stile crossbar exit device for standard commercial hollow metal and wood doors. Where the 55 Series is the narrow stile crossbar for aluminum storefronts, the 88 is the wide stile crossbar for doors with 4-1/2 inches or more of stile width. The 88 Series has been in production since at least the 1950s and remains in the Von Duprin catalog because it serves two applications that pushpad devices cannot: traditional-looking wide stile installations where the crossbar aesthetic is an architectural requirement, and non-standard door widths where the field-cuttable crossbar can be sized precisely without special ordering.

88 Series Crossbar Tube: Part 967738

The Von Duprin 88 and 55 Series share the same crossbar tube (part 967738). The tube is 1 inch in diameter and 42 inches long. It ships at 42 inches and must be field-cut to the appropriate length for the specific door width using a tubing cutter or hacksaw. One side of the tube comes pre-cut with a slot for the wedge tite screw opening. This pre-cut slot must be positioned correctly when the crossbar is installed in the lever arm.

Tube Attaching Ring and Wedge Tite Screw

The tube attaching ring (part 090021) fits over each lever arm and is expanded by the wedge (part 88R90) and the wedge tite screw (part 88R100) to clamp the crossbar securely to the arm. The ring measures 15/16 inch long by 13/16 inch diameter. When tightened, the ring expands and holds the crossbar parallel to the door without visible fasteners on the front face of the bar.

A rattling crossbar or a crossbar that has dropped at one or both ends is almost always caused by loose wedge tite screws, not by failed components. The correct service is to tighten the wedge tite screw in each lever arm with a drop of blue thread-locker applied before final tightening. Thread-locker prevents vibration-induced loosening on high-cycle doors without making the screw impossible to remove for future service.

88 Series Lever Arm Assemblies

The 88 Series lever arm connects the crossbar to the center case mechanism. The lever arm is handed: right hand is part 050438, left hand is part 050439. Each arm includes the wedge, wedge ring, wedge tite screw, and dog screw. Some kits also include the axle.

Lever arm replacement is needed when the dogging screw in the arm has stripped (the most common failure reason according to field service records), when the arm is physically bent from impact, or when the axle has failed. The axle is a separately replaceable component: the current axle design (introduced around 1990) snaps together and replaces the older design that used allen-wrench-assembled axles. When replacing an axle, the separation tool is required to disassemble the current snap-together style.

The 88 Series Dogging Pin: The Failure Nobody Diagnoses

The Von Duprin 88 Series uses a dogging pin mechanism located on the underside of the active lever arm to hold the crossbar in the depressed position during business hours. This is different from the hex key slot used on the 22, 33A, and 98/99 Series. The dogging pin has an internal spring that provides the retention force.

88 Series Field-Reversible Handing

The 88 Series is field-reversible for handing. This means the device can be converted from right-hand to left-hand or vice versa in the field without returning the device for a factory conversion. This saves the project when door handing has been incorrectly specified: a Friday afternoon discovery that the device is the wrong hand can be corrected on-site rather than requiring a return and reorder. Confirm handing before installation regardless, but this reversibility is a genuine specification advantage over devices requiring factory handing.

88 Series Mounting Screw Package

The 88 Series mounting screw package (part 900503) includes 12 screws in two types: 6 machine screws and 6 hybrid screws (for the 88C/C or E/C mounting configurations). Always use the correct screw type for the specific mounting configuration. Using only machine screws on a hybrid mounting leaves the device with reduced pull-out resistance at the center case anchor points.

Von Duprin 94/95 INPACT Series: Recessed Push Pad Parts

The Von Duprin INPACT 94/95 Series is the only fully recessed exit device in the Von Duprin commercial line. Instead of a push pad that projects outward from the door face, the INPACT push pad sits within a routed recess in the door so the pad face is flush with or set back slightly from the door surface. From a distance, the device appears to be part of the door panel rather than hardware mounted to it.

Why the Recessed Design Exists

The recessed design solves a specific problem in high-traffic environments where equipment regularly passes through doorways: medical facilities with gurney traffic, emergency departments with IV pole carts, warehouses with pallet jacks. On these doors, a projecting push pad takes repeated equipment impact that bends the pad, loosens the mechanism case, and damages the door itself over time. The INPACT's recessed pad eliminates the protrusion that equipment contacts, extending the device's service life dramatically on impact-prone doors.

94 vs 95 Series

The 94 Series has a grooved push pad surface. The 95 Series has a smooth push pad surface. Both are mechanically and dimensionally identical. All internal parts are shared between 94 and 95. The choice between them is purely aesthetic and is made at specification time based on building design preference. When ordering replacement parts for either series, the part numbers are the same.

INPACT Door Preparation Requirements

The INPACT 94/95 requires a routed recess in the door face for the mechanism case. This prep is built into the door during manufacturing. Steelcraft hollow metal doors are specifically listed as compatible with the standard INPACT door prep. If an INPACT device must be installed on a door that was not prepped at manufacturing, the door must be routed in the field to the INPACT specification, which requires a different site operation than standard exit device installation.

INPACT Electronic Options

The INPACT 94/95 Series supports Quiet Electric Latch Retraction (QEL) and field-reversible handing. The QEL option makes the INPACT particularly well-suited to healthcare corridor applications where both impact protection (recessed pad) and quiet electric latch operation are specified simultaneously. These two features together address the two most common exit device complaints in healthcare: equipment impact damage and latch noise in patient care areas.

Von Duprin 54 Series Mullions: Parts and Critical Security Considerations

A mullion is a vertical structural member that mounts between the two leaves of a double-door opening to provide a fixed strike-receiving element for rim exit devices. Without a mullion on a double-door opening, a rim exit device has no fixed jamb to mount a strike to. The rim latch would have no receptacle, and the door pair could not latch.

Why Mullions Matter for Fire Door Code Compliance

On fire-rated double-door openings, the code governing whether a rim exit device is permitted or a concealed vertical rod device is required turns on whether a mullion is present. A rim exit device on a fire-rated pair without a mullion is a non-compliant installation: the rim strike mounts to the active door leaf, which is not a fixed structure and cannot provide the fire-resistive separation required by the door assembly listing. With a fixed or removable mullion providing a fixed strike location, rim exit devices are permitted on most fire-rated pairs. Without a mullion, concealed vertical rod devices are required.

54 Series Mullion Types

Mullion Fittings and Covers

The top fitting and cover (part 050135) and the bottom fitting (part 050190) are the end cap assemblies for the 5654 and 5754 mullions. The fitting set (part 050130) includes both top and bottom fittings with all mounting screws. When a mullion fitting is damaged from impact or the fasteners have stripped, the fitting is a separately replaceable component. Always confirm whether the damage is to the fitting only or to the mullion tube body itself before ordering, as these are different parts.

Mullion Stabilizer: The Security Component Nobody Installs

The Von Duprin 154 mullion stabilizer package is included in the box when the 5654 aluminum mullion is purchased. It is the most overlooked component on every mullion installation.

The stabilizer prevents lateral deflection of the mullion under door abuse and impact loading. When a mullion deflects sideways from someone pushing or shaking a door hard, the deflection moves the strike out of alignment with the rim latch on both door leaves simultaneously. This causes both exit devices to release, effectively opening the entire double-door opening without any key, credential, or authorized access event. The 154 stabilizer braces the mullion against the door frame, preventing this deflection and maintaining strike alignment under impact.

Weather Stripping for Mullions

The Von Duprin weather stripping (part 050580) is specific to the 5654 and 5754 mullions. Each strip is 10 feet long. Two strips are required per mullion (one on each side of the mullion facing the door leaves). This is an often-omitted component on interior mullion installations but a required component on exterior door applications where the mullion must provide an air and weather seal against the door leaves.

How to Identify the Correct Series and Parts

Five questions determine the correct parts before any order for these series.

1. Is this a pushpad, crossbar, or recessed device? Crossbar spanning the door width = 88 Series (or 55 if narrow stile). Recessed pad flush with door face = 94/95 INPACT. Projecting rectangular pushpad = 75 or 78 Series (or 22, 33A, 98/99 from other series). If in doubt, check the label on the mechanism case.

2. Is the door stile narrow or wide? Narrow stile aluminum storefront = 75 Series (pushpad) or 55 Series (crossbar). Wide stile hollow metal or wood = 78 Series (pushpad) or 88 Series (crossbar). The 88 requires a minimum 4-1/2 inch stile.

3. For mullion parts: is the mullion fixed or removable? A mullion with no visible release mechanism is fixed (5654 or 5754). A mullion with a cylinder or lever release is removable (1654 or 4954). Removable mullions use different fittings from fixed mullions.

4. For 88 Series crossbar parts: is the failure the crossbar tube, the lever arm, or the dogging pin spring? Rattling or dropped crossbar = wedge tite screw loose, no parts needed. Stripped dogging in arm = dogging pin spring first, lever arm assembly only if spring replacement fails. Bent or broken arm body = lever arm assembly replacement (050438 RH or 050439 LH).

5. For INPACT parts: confirm the trim series is 94/95-specific. INPACT trim (940, 550 for INPACT, 376) is not interchangeable with standard Von Duprin trim. Ordering standard trim for an INPACT installation produces parts that physically will not seat in the recessed door prep geometry.

Browse the Von Duprin parts catalog at SecurityParts.com for 75, 78, 88, 94/95 INPACT, and 54 Series mullion components with interactive diagrams. For the full exit device catalog including Falcon exit devices, browse the commercial exit devices catalog. For Von Duprin electric strike parts, browse the electric strikes catalog. Pre-order support is at 845-935-0301 or the contact page.

Related Parts and Products at Security Parts

Von Duprin 75, 78, 88, and INPACT exit devices appear on the same doors as electric strikes, door closers, and cylindrical locks. Mullions appear on double-door openings that also typically include one of these exit device series.

For Von Duprin electric strike parts on 75, 78, 88, or INPACT rim device installations with controlled entry, browse the electric strikes catalog. For exit alarm parts including Von Duprin Guard-X and Detex ECL and EAX for secondary exit monitoring, browse the exit alarms catalog. For LCN door closer parts on fire-rated egress doors in the same building, browse the door closers catalog. For Schlage ND and ALX Series cylindrical lock parts on interior doors in the same facility, browse the cylindrical locks catalog. For Falcon 19, 24, and 25 Series exit device parts as an alternative brand on newer construction egress doors in the same building, browse the Falcon hardware catalog.

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

Security Parts carries parts for the Von Duprin 22, 33A/35A, and 55 Series exit devices. The 22 Series is the economy wide stile device for medium-to-low traffic with a 3-13/16 inch minimum stile. The 33A/35A is the narrow stile pushpad device with a fluid dampener, deadlocking latch, and concealed VR configurations for stiles as narrow as 2-1/8 inches. The 55 Series is the traditional crossbar device for aluminum storefront doors with stiles as narrow as 1-3/4 inches. Key shared parts: the dogging shaft and adapter work across 22, 33A, 98, and 99 Series. The 33A/35A ALK alarm kit is compatible with 22, 33A, 35A, 98, and 99 Series. The 55 Series uses dedicated narrow stile trim that is not interchangeable with any other Von Duprin series.

Von Duprin invented the first self-releasing fire exit device over a century ago. The 22, 33A/35A, and 55 Series represent three distinct product lines that together cover the majority of commercial egress doors installed in North America from the 1970s through today. When one of these devices needs a replacement part, the most critical first step is confirming which series is installed. Parts from the 33A/35A will not work on the 22. Parts from the 55 will not work on either. Trim from the 98/99 will not fit the 55. Getting the series wrong generates a return.

Browse the complete Von Duprin parts catalog at SecurityParts.com for 22, 33A/35A, 55, and all other Von Duprin series with interactive diagrams. For the full exit device catalog including Falcon exit devices alongside Von Duprin, browse the commercial exit device parts catalog.

Three Series, Three Applications: How to Choose and Why It Matters for Parts

Von Duprin 22 Series Parts

The 22 Series is the value-line option in the Von Duprin exit device catalog. It is not a light-duty device: it carries the same ANSI A156.3 Grade 1 certification as the 33A/35A and 98/99 Series and is UL listed for both panic and fire hardware. What distinguishes it from the 33A/35A is the absence of a fluid dampener and deadlocking latch, a narrower trim compatibility range, and no concealed VR configuration. For doors where these features are not required, the 22 Series provides genuine Von Duprin Grade 1 quality at a more economical price point.

22 Series Center Case

The center case is the core mechanism housing that contains the latch bolt and push bar actuating mechanism. The 22 rim device center case and the 2227 surface vertical rod center case are different parts and not interchangeable. The 2227 (SVR version) has a separate center case because it must accommodate the rod actuating mechanism in addition to the latch bolt. When ordering a replacement center case, always confirm whether the installed device is a 22 rim (single latch point) or 2227 SVR (two-point latching with top and bottom rods).

22 Series Dogging Cover Plates

The dogging cover plate covers the dogging assembly on the hinge side of the exit device. It is a frequently lost or damaged component. On 3-foot devices, the cover plate part number is 968595 (10-3/4 inches long). On 4-foot devices, the cover plate is 968596 (16-3/4 inches long). These cover plates are device-length specific. Installing a 3-foot cover plate on a 4-foot device leaves the dogging assembly exposed and vulnerable to damage and debris accumulation.

22 Series End Cap and 2227 Rod Guide Assembly

The end cap covers the hinge-side end of the mechanism channel. The 22 Series uses the 050014 impact-resistant end cap kit (shared with 33A/35A and 98/99 Series) which replaces all previous end cap versions. This cross-series compatibility is one of the few shared parts between the 22 and 33A/35A families.

The 2227 rod guide assembly 112063 replaces the older style SVR rod guide that used a plastic cap and springs. The new rod guide adds strength and rigidity to the top and bottom rods on the surface VR version. If the rods on a 2227 installation show visible flex or misalignment during operation, the rod guide assembly is the correct replacement.

22 Series Trim and Cylinder Compatibility

The 22 Series uses the 230L lever trim (works on both 22 rim and 2227 SVR) and the 210L knob trim. The trim-to-device interface on the 22 Series uses a tailpiece guide (part 22-ALK, 33A-ALK, 35A-ALK, 98-ALK, and 99-ALK are all the same tailpiece guide) that guides the rim cylinder tailpiece into the back of the exit device. This part is shared between the 22, 33A, 98, and 99 Series.

Von Duprin 33A/35A Series Parts

The 33A/35A Series is Von Duprin's highest-performing push pad exit device for narrow stile applications. The fluid dampener, deadlocking latch, and full concealed VR configuration range set it apart from both the 22 Series and the 55 Series for any application requiring high performance on a narrow stile door. Understanding the parts requires knowing which configuration is installed, because center cases, cover plates, and rod assemblies differ across rim, surface VR, and concealed VR versions.

33A vs 35A: The Case Style Distinction

The 33A has a grooved (ribbed) mechanism case exterior. The 35A has a smooth mechanism case exterior. Both are mechanically and dimensionally identical in every other respect. All internal parts, including the center case assembly, dogging shaft, end cap, latch bolt, and fluid dampener, are the same between 33A and 35A. When ordering parts for a 33A/35A device, the case style (grooved vs smooth) does not affect internal part numbers. It only affects the external center case cover, which is a cosmetic and protective component that is series-specific but not interchangeable between grooved and smooth styles.

Fluid Dampener: The Noise-Reduction Component

Every 33A/35A exit device is equipped with a fluid dampener that decelerates the push pad on its return stroke after being pressed. This is the feature that makes the 33A/35A appropriate for quiet-operation environments: healthcare corridors, educational facilities, and any space where the metal-on-metal snap-back of an un-dampened push pad would be a noise disturbance.

The fluid dampener is part of the mechanism case assembly. It cannot be replaced as a standalone field component: the dampener is integrated into the center case during manufacturing. If the dampener fails (indicated by loud snap-back noise on push pad return that was not previously present), the center case assembly replacement is the correct service action.

33A/35A Concealed Vertical Rod Configurations

The 33A/35A Series offers two concealed vertical rod configurations for different stile width situations.

3347A/3547A (concealed VR, 3-1/2 inch minimum stile): Used on hollow metal single and double doors where the stile is 3-1/2 inches or wider. The concealed rods run inside the door stile with no visible rod hardware on the door face. The top latch (part 050494) is used on both 33A, 35A, 98, and 99 concealed VR devices. This cross-series compatibility on the concealed top latch is one of the few cases where 33A/35A and 98/99 parts overlap on CVR configurations.

3348A/3548A (narrow concealed VR, 2-1/8 inch minimum stile): Used on hollow metal doors with stiles as narrow as 2-1/8 inches. This is the narrowest concealed VR configuration in the Von Duprin line and is specified on doors that cannot accommodate the 3347A minimum stile. Fire-rated versions (3348A-F and 3548A-F) support 8-foot by 10-foot door pairs at UL fire listing.

33A/35A and 22 Series Shared Dogging Shaft

The dogging shaft and dogging adapter that have been in production since 1998 are shared across the Von Duprin 22, 33, 33A, 98, and 99 Series devices. This is confirmed by the official Von Duprin parts catalog. The dogging shaft is the current standard replacement for any of these series when dogging function fails. The hex key dog conversion kit (parts 050114 and 050117) converts 33A and 99 Series hex key dogging to cylinder dogging, allowing a standard mortise cylinder to control dogging without carrying a hex key. The conversion kit does not include the cylinder.

33A/35A Alarm Kit (ALK)

The ALK alarm kit converts a 22, 33A, 35A, 98, or 99 Series exit device to an alarmed device. When the push bar is pressed, a 100dB battery-powered alarm sounds. The kit is powered by a standard 9-volt battery and controlled by a mortise cylinder (not included). The kit includes the EMERGENCY EXIT ONLY. ALARM WILL SOUND decal. An ALK power supply is available for hardwired operation of one or two alarm kits from a single 12V or 24V power source. Browse the exit alarm parts catalog at SecurityParts.com for ALK kits and Detex and Von Duprin Guard-X alarm components.

Von Duprin 55 Series Parts: The Crossbar Legacy Line

The Von Duprin 55 Series has been in production since at least the 1970s. It is the traditional crossbar exit device: instead of a push pad, it uses a suspended metal crossbar that spans nearly the full door width and activates the latch mechanism when any part of the bar is pressed. This design predates the push pad era and remains in production because it serves two applications that the pushpad cannot match: it is the only Grade 1 Von Duprin device for storefront aluminum doors with stiles at the absolute minimum of 1-3/4 inches, and it is the correct retrofit device for historic and mid-century buildings where maintaining the crossbar aesthetic is an architectural requirement.

55 Series Center Case (Part 050183)

The 55 Series center case (part 050183) is the core replacement housing for the 55 rim device. It includes all internal workings and the latch bolt. The center case geometry on the 55 Series is completely different from the 22, 33A, or 98/99 Series. Center cases are not cross-compatible. When ordering a replacement 55 Series center case, confirm the device is a 55 rim (single latch point) rather than the 5547 concealed VR, as these are different assemblies.

55 Series Lever Arm and Hinge Case Axle

The 55 Series uses a lever arm mechanism that connects the crossbar to the center case and activates the latch when the crossbar is pressed. The lever arms are handed: right hand (050355) and left hand (050356). Always confirm the device handing before ordering a lever arm.

The center case axle (090050) is used on the 55 rim device. The hinge case axle (090051) is used on the inactive housing (hinge side) and on all other 55 configurations including the 5547 CVR device. The arm bushing (050333) takes up the mechanical slack between the lever arms and the housing; it is a wear component that should be checked when lever arm movement feels loose or imprecise.

55 Series Trim: Dedicated and Non-Interchangeable

The 55 Series uses narrow stile-specific outside trim that is not compatible with any other Von Duprin series. The three standard trim options are 550DT (dummy pull, non-functional outside handle), 555NL (night latch with outside cylinder that locks and unlocks the push bar), and 379L (outside lever trim). Standard Von Duprin 360L, 230L, or 99/98 Series trim will not fit the 55 Series because the mechanism case geometry is different.

When a 55 Series installation needs outside trim replacement, always order from the 55-specific trim range. When a building has a mix of 55 Series and 98/99 or 33A devices, the trim from one series cannot be used on the other even if the finish matches.

5547 Concealed Vertical Rod: The 55 Series Double-Door Solution

The 5547 is the concealed vertical rod version of the 55 Series, used on double-door aluminum storefront configurations where both doors need the crossbar aesthetic with concealed rod latching. The 5547 blind fastener kit (900539) connects the rod control housing to the rods and is specific to the 5547 CVR only. The 5547 uses the hinge case axle (090051) as does all 55 Series hardware except the 55 rim center case.

Parts Cross-Compatibility: What Works Across Series and What Does Not

The most expensive parts ordering mistakes on Von Duprin exit devices happen at the series boundary. Some parts cross series; most do not.

How to Identify the Correct Series Before Ordering

The series identification that prevents a wrong-part return takes under 30 seconds on any Von Duprin installation.

Is there a push pad or a crossbar? A crossbar spanning most of the door width = 55 Series. A push pad (compact rectangular bar) = 22, 33A, 35A, 98, or 99 Series. Go to the next check.

Is the door stile wide (4 inches or more) or narrow (under 4 inches)? Wide stile hollow metal doors most often have 98/99 or 22 Series. Narrow stile aluminum storefront doors most often have 33A/35A or 55 Series. The device label on the mechanism case confirms the exact series.

Check the mechanism case label. The series number is on a label on the center case. This is the definitive identification. On the 33A, the case exterior has visible ribs (grooved). On the 35A, the case is smooth. Both are current generation if the center case cover is one piece. Older 33/35 Series (pre-2002) have a two-piece center case cover.

Browse the Von Duprin parts catalog at SecurityParts.com with interactive diagrams for all series. For Von Duprin electric strike parts compatible with 22 and 33A/35A rim exit devices, browse the electric strikes catalog. For Von Duprin Guard-X exit alarm parts, browse the exit alarms catalog. For the full Falcon exit device catalog as an alternative brand, browse the Falcon hardware catalog. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at SecurityParts.com

Von Duprin 22, 33A/35A, and 55 Series exit devices typically appear on egress doors alongside electric strikes for controlled entry and LCN door closers for self-closing operation on fire-rated assemblies.

For Von Duprin 5100, 6100, 6200, and 6300 electric strike parts compatible with 22, 33A/35A, and 55 Series rim devices, browse the electric strikes catalog. For Von Duprin Guard-X and Detex ECL and EAX exit alarm parts, browse the exit alarms catalog. For LCN door closer parts on fire-rated egress doors in the same building, browse the door closers catalog. For Schlage ND and ALX Series cylindrical lock parts on interior doors in the same facility, browse the cylindrical locks catalog. For Falcon 19, 24, and 25 Series exit device parts as an alternative brand on newer or renovation egress doors in the same building, browse the Falcon hardware catalog.

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

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.