Quick Answer

The LCN 4040XP uses a fixed shoe arm system. The 4040XPT uses a rolling track arm system. Parts are not interchangeable between the two. Before ordering any LCN 4040XP parts, confirm four things:

• Model variant: 4040XP (arm and shoe) or 4040XPT (track and track arm). The two share the same closer body but use completely different arm hardware.
• Arm type: Regular, EDA (Extra Duty), CUSH (spring cushion), or PA (parallel arm). Each is a different part number and serves a different application.
• Hold-open or standard: Hold-open arms lock the door at the open position. Standard arms close freely from any point. The part number suffix distinguishes them.
• Arm length: Standard, long (L), or extra long (XL), determined by the door reveal depth.

Security Parts stocks the full 4040XP and 4040XPT parts catalog with same-day shipping on stocked items. Browse the LCN 4040XP model page and the 4040XPT model page for the complete parts list. Call 845-935-0301 for pre-order compatibility support.

What the LCN 4040XP Is and Why the Arm System Matters for Parts

The LCN 4040XP SuperSmoothee is the institutional benchmark Grade 1 surface-mounted door closer from Allegion. It is the most widely installed heavy-duty commercial closer in the US market, specified across hospitals, universities, government buildings, and K-12 schools. When a 4040XP arm fails, the part number depends entirely on which arm configuration was originally installed. Ordering the wrong arm type is the most common sourcing mistake on this product.

The 4040XP uses a cast iron cylinder body with a four-function hydraulic valve, Fast Power Adjust spring power control, and Liquid-X all-weather hydraulic fluid. It carries Grade 1 ANSI/BHMA A156.4 certification and meets Buy American Act (BAA) requirements for government projects. All of that institutional hardware lives in the closer body, which rarely fails. What fails is the arm assembly, the shoe, or on track versions, the track and roller.

For a reference on installing and adjusting the 4040XP after arm replacement, see the LCN 4040XP installation template guide and the commercial door closer adjustment guide.

4040XP vs 4040XPT: Two Different Parts Systems

The 4040XP uses a fixed shoe mounted on the door frame. The arm connects the closer spindle to that shoe and drives the door through its arc. The 4040XPT replaces the shoe with an aluminum track, and the arm rides inside the track on a roller throughout the door's travel. The closer body is the same on both. Everything else (the arm, the shoe or track, the roller, the hardware) is different.

If the existing installation has a channel mounted horizontally on the frame with the arm riding inside it, the unit is a 4040XPT. If the existing installation has a fixed plate on the frame with a rod-and-shoe connecting to the arm tip, the unit is a 4040XP. Confirming this before ordering prevents the most common return on this product line.

LCN 4040XP Arm Types and Part Numbers

The 4040XP arm system organizes into four main arm families. Within each family, the arm is available in standard (no hold-open) and hold-open (HO) variants. Hold-open arms add a friction mechanism at the shoe that locks the door open at a user-set position when the door is pushed past approximately 70 degrees. Standard arms allow the closer to pull the door closed from any open position without locking.

Regular Arm

The regular arm is the standard 4040XP arm for pull-side and top jamb mounting with shallow reveal. It connects the closer spindle to the rod and shoe on the door frame. Available configurations:

• 4040XP-3077 / 3077PA: Standard regular arm. Non-handed. Mounts pull side or top jamb. The 3077PA variant includes the 62PA parallel arm shoe for parallel mounting.
• 4040XP-3077/62A: Regular arm with auxiliary shoe pre-installed. Saves ordering the 62A shoe separately when that configuration is required.
• 4040XP-3077L: Long arm for deeper reveals. Order the 4040XP-3077L long arm when the standard rod and shoe does not reach the frame shoe mount.
• 4040XP-3077XL: Extra long arm for the deepest reveal situations. Order the 4040XP-3077XL extra long arm when both standard and long arms fall short.

Hold-open variants for the regular arm: 4040XP-3049PA (with 62PA shoe), 4040XP-3049/PA, and 4040XP-3049L (long hold-open arm). The 4040XP-3049L hold-open long arm is the correct part for deep-reveal hold-open configurations.

EDA Arm (Extra Duty Arm)

LCN 4040XP-3077EDA Extra Duty Arm. View product page and order.

The EDA (Extra Duty Arm) uses heavier stamped steel construction than the standard regular arm. It is specified for high-abuse applications where standard arms fail prematurely: institutional buildings, behavioral health facilities, high-traffic hospital corridors, and correctional environments. The EDA arm has a wider pivot design and higher cycle rating than the standard arm.

• 4040XP-3077EDA: Standard EDA arm, no hold-open.
• 4040XP-3049EDA: Hold-open EDA arm. Holds door open at set position.
• 4040XP-3077EDA/G: EDA arm with 62G shoe pre-installed for 180-degree swing applications.

The EDA arm is non-handed and mounts pull side or top jamb with shallow reveal, the same as the regular arm. If the existing arm is marked "EDA" or shows the heavier stamped construction, order the EDA replacement rather than the standard arm.

CUSH Arm (Spring Cushion Arm)

LCN 4040XP-3077CNS Cush Arm. View product page and order.

The CUSH arm adds a spring-loaded contact block at the shoe end that absorbs impact energy when the door reaches its maximum open position. It is used on doors that frequently bang into stops or walls, where the impact shortens the life of the arm, the shoe, and the door frame hardware. The spring cushion absorbs and dissipates that impact energy before it reaches the frame.

• 4040XP-3077CNS: Standard CUSH arm, no hold-open.
• 4040XP-3049CNS: Hold-open CUSH arm. Holds door open and cushions impact.
• 4040XP-3077SCNS: Spring CUSH arm. Stronger spring tension for heavier impact loads.
• 4040XP-3049SCNS: Spring hold-open CUSH arm. Both hold-open and heavy spring cushion.

The spring cush block assembly (4040XP-3080) is the primary wear component in the CUSH system. Order the 4040XP-3080 spring cush block assembly as a standalone replacement when the cushion block has worn but the arm itself is still functional. The cush shoe support (4040XP-30) and blade stop spacer (4040XP-61) are required accessories for CUSH installations on doors with 1/2-inch blade stops.

Parallel Arm Mounting and the PA Shoe

LCN 4040XP-62PA Parallel Arm Shoe. View product page and order.

Parallel arm mounting places the closer on the push side of the door with the arm running along the door face. The frame-mounted shoe (62PA) is on the push side of the frame. This configuration is used when pull-side clearance is insufficient or when the door specification requires a push-side installation.

The 4040XP-62PA parallel arm shoe is a handed component. It must be specified for the correct door swing direction. The 62PA is included with PA arm packages (3077PA, 3049PA) and is available separately for replacement.

The auxiliary shoe (4040XP-62A) serves a different purpose: it provides an additional contact point on the frame for specific arm geometries. The 4040XP-62A auxiliary shoe is included pre-installed on the 3077/62A arm package and is available separately.

LCN 4040XP Rod and Shoe: Selecting the Right Length

The rod and shoe connects the main arm to the frame shoe and is the component most directly affected by door reveal depth. Reveal depth is the distance from the door face to the inside edge of the frame stop. Ordering the wrong rod and shoe length results in an arm that either cannot fully close the door or sits at an incorrect operating angle.

Arm length (3077, 3077L, 3077XL) and rod-and-shoe length work together. A long arm (3077L) typically pairs with the long rod and shoe (79LR). An extra long arm (3077XL) typically pairs with the extra long rod and shoe (79ELR). Refer to the LCN 4040XP installation diagram, available on the 4040XP diagram page to confirm the correct combination for the specific reveal depth and mounting configuration.

LCN 4040XP Cylinder Assembly and Internal Components

The 4040XP uses a cast iron cylinder assembly (4040XP-3071) that is heavier duty than the standard 4000 Series cylinder. The cast iron construction distinguishes it from the lighter 4050A and 4030 Series cylinders and is part of why the 4040XP is the institutional specification standard rather than the lighter commercial alternatives.

The 4040XP-3071 cast iron cylinder assembly is available as a complete replacement when the internal hydraulic components have failed and the closer body needs to be rebuilt rather than replaced. The arm screw (4040XP-83H) secures the arm to the closer spindle and is a common replacement on doors where the arm has been removed multiple times.

LCN 4040XPT Track Parts

The 4040XPT track system replaces the fixed shoe with an aluminum track mounted horizontally on the frame. The arm connects to a rolling carriage that travels inside the track throughout the door's travel arc, which allows the door to open to a wider range of positions without the arm reaching mechanical limits.

Track Selection for the 4040XPT

LCN 4040XPT-3038 Standard Track. View product page and order.

Four track configurations are available for the 4040XPT. The suffix indicates the features:

• 4040XPT-3038: Standard track, no hold-open, no bumper.
• 4040XPT-3038H: Track with hold-open. The track roller locks the door in the open position when pushed past the hold-open engagement point.
• 4040XPT-3038B: Track with bumper. Adds a cushioned end-stop at the full-open position.
• 4040XPT-3038HB: Track with hold-open and bumper. Combines both features.

Track Arm and Track Rollers for the 4040XPT

LCN 4040XPT-3077T Standard Track Arm. View product page and order.

The track arm (4040XPT-3077T) connects the closer spindle to the track roller carriage. It is handed and must be specified for the correct door swing. The 4040XPT-3077T standard track arm is the most commonly replaced component on the XPT system after the track itself.

Track rollers are the wear component that fails most frequently in high-cycle track installations:

• 4040XPT-3034: Standard track roller. Replaces a worn or seized roller without replacing the full track.
• 4040XPT-3034H: Hold-open track roller. Required on hold-open track configurations (3038H, 3038HB) to maintain the hold-open function.
• 4040XPT-3054: Hold-open clip. Secondary hold-open component that works with the 3034H roller.
• 4040XPT-425: Roller lock screw. Secures the track roller to the arm carriage. Replace when the roller shows lateral movement in the track.

LCN 4040XPT Track Parts Reference Table

LCN 4040XP Parts Reference Table

Where LCN 4040XP Parts Are Sourced at Security Parts

Security Parts stocks the full LCN 4040XP and 4040XPT parts catalog. The LCN 4040XP model page lists all available 4040XP arm and hardware parts by category. The 4040XPT model page covers the full track system catalog. Interactive diagrams are available on the 4040XP diagram pages for visual part identification before placing an order.

The 4040XP is specified across the most demanding commercial applications: healthcare facilities where the closer faces thousands of daily cycles, government buildings requiring BAA compliance, and universities where institutional durability is the primary specification driver. For the hardware context of those applications, see the healthcare door hardware guide, the government buildings guide, and the Division 8 specification guide.

For broader LCN door closer selection across the full 4000 Series and 2210 concealed closer, see the LCN 4000 Series and 2210 parts guide and the LCN commercial door closer selection guide. For fire door closer compliance including NFPA 80 inspection requirements, see the fire door closer adjustment guide and the commercial door fire rating guide.

Same-day shipping is available on stocked 4040XP components. Call 845-935-0301 for pre-order compatibility support when the arm configuration or reveal dimension needs verification before the order ships.

About the Author

This guide was written by the Security Parts team, a commercial door hardware specialist serving locksmiths, facilities managers, general contractors, and access control integrators since 2001. Security Parts stocks the full LCN 4040XP and 4040XPT replacement parts catalog with same-day shipping on stocked components and pre-order compatibility support at 845-935-0301.