HySecurity MX001872, LIMIT SWITCH, ASSEMBLY, SA
HySecurity MX001872 is a limit switch assembly / limit switch kit for select HySecurity StrongArm barrier gate operator applications. HySecurity parts documentation lists MX001872 as the Limit Switch Kit for StrongArm models, and current listings describe the part as "LIMIT SWITCH, ASSEMBLY, SA."
This kit is commonly described as including 2 limit switches, a mounting bracket, and hardware. Because limit switch parts control open and close stopping points, this assembly should be selected only after confirming the operator model, serial number, limit switch bracket style, wiring, limit cam condition, and HySecurity parts diagram.
What This Limit Switch Assembly Does
The limit switch assembly works with the StrongArm limit cam to help the operator recognize open and close travel positions. As the barrier arm moves, the cam actuates the switches so the controller can respond at the correct stop points where the system is designed for mechanical limit switch operation.
A failed, damaged, misaligned, loose, or incorrectly wired limit switch assembly can contribute to overtravel, early stopping, failure to stop at the correct position, intermittent limit faults, or repeated limit setup problems. Similar symptoms can also be caused by a loose or worn limit cam, damaged wiring, worn crankshaft parts, a damaged bearing, cylinder movement problems, incorrect controller setup, arm binding, or incorrect arm balance.
Compatible With
Use HySecurity MX001872 only where the operator parts diagram, original limit switch assembly, or HySecurity documentation confirms this part number.
- Select HySecurity StrongArm barrier gate operator applications where MX001872 is listed as the limit switch assembly or limit switch kit.
- HySecurity StrongArm models where the parts diagram lists MX001872 for the limit switch kit location.
- StrongArm / SA repairs where the original limit switch assembly is marked, listed, or cross-referenced as HySecurity MX001872.
- Applications where the limit switches, mounting bracket, wiring, and limit cam arrangement match the HySecurity parts diagram.
- Travel or stop-position repairs where diagnosis confirms the limit switch assembly is worn, damaged, misaligned, or no longer serviceable.
Important Compatibility Warning
Do not order MX001872 based only on the words "limit switch." HySecurity documentation lists a separate MX001777 limit switch and MX001872 limit switch kit for StrongArm models. Verify whether the repair requires the complete assembly/kit or only a standalone limit switch.
MX001872 should also not be confused with the MX000299 limit cam. The limit cam and limit switch assembly work together, but they are different parts. If either part is loose, worn, misaligned, or damaged, the barrier arm may not stop where expected.
Similar Parts That Are Not Automatically Interchangeable
- mx001777-limit-switch-for-strongarm-and-swingsmart-dc-gate-operators.html">HySecurity MX001777 - limit switch for StrongArm models; related switch part, not necessarily the same as the complete MX001872 kit.
- mx000299-1-25-inch-limit-cam-strongarm.html">HySecurity MX000299 - 1.25 inch limit cam for StrongArm; works with the limit switch assembly but is not the same part.
- mx001100-crankshaft-bearing-zerk-keys-strongarm.html">HySecurity MX001100 - crankshaft with bearing, zerk and keys; related drive component, not the limit switch assembly.
- HySecurity MX000306 - 4-bolt crankshaft bearing; not the same as the limit switch assembly.
- mx000077-2-inch-x-6-inch-cylinder-assembly-strongarm.html">HySecurity MX000077 - StrongArm cylinder assembly; not the same as the limit switch assembly.
- mx000312-stainless-steel-cylinder-pin-strongarm.html">HySecurity MX000312 - cylinder pin; related linkage hardware, not the limit switch assembly.
- Smart Touch controller components - may report limit or travel issues but are not the limit switch assembly.
- Arm brackets, yokes, counterweights, and complete barrier arms - related StrongArm hardware but not interchangeable with MX001872.
Not Intended For
- Limit cam replacement.
- Crankshaft, crank bearing, or key stock replacement.
- Hydraulic cylinder or cylinder pin replacement.
- Hydraulic hose, pump pack, manifold, or valve replacement.
- Side-mount arm bracket, yoke bracket, counterweight, or complete barrier arm replacement.
- StrongArm M30/M50, StrongArmPark, SwingRiser, HydraSwing, HydraLift, HydraWedge, SlideDriver, SlideSmart, SwingSmart, or WedgeSmart operators unless the parts diagram specifically lists MX001872.
- Repairs where the actual issue is controller setup, arm binding, limit cam damage, wiring damage, hydraulic drift, or incorrect arm balance.
Features & Specifications
| Feature / Specification | Details |
| Manufacturer | HySecurity / Nice HySecurity |
| Part Number | MX001872 |
| Product Type | Limit switch assembly / limit switch kit |
| Common Description | Limit Switch, Assembly, SA |
| Common Application | Select HySecurity StrongArm barrier gate operator applications |
| Operator Family | StrongArm / SA where listed by parts diagram |
| Commonly Listed Included Parts | 2 limit switches, mounting bracket, and hardware; verify current package contents before ordering |
| Related Mechanical Part | MX000299 limit cam, separate part unless stated |
| Function | Works with limit cam hardware to support open/close travel stopping points |
| Package Contents | Verify current package contents before ordering; limit cam, wiring harnesses, and controller parts may be separate unless stated |
Also Known As / Related Part Numbers
- MX001872
- HySecurity MX001872
- Nice HySecurity MX001872
- HYS-MX001872
- HYS-mx001872
- MX001872-5128
- HySecurity limit switch assembly
- HySecurity StrongArm limit switch assembly
- HySecurity limit switch kit
- Limit Switch, Assembly, SA
- Limit Switch Kit, StrongArm
- StrongArm limit switch kit with bracket and hardware
- MX001777 - related StrongArm limit switch; not necessarily the same as the complete kit
- MX000299 - related StrongArm limit cam; not the same part
- MX001100 - related crankshaft assembly; not the same part
- MX000306 - related crankshaft bearing; not the same part
- MX000077 - related cylinder assembly; not the same part
Related Parts and Accessories
The correct related parts depend on the installed StrongArm model, limit switch arrangement, cam condition, and reason the arm is not stopping correctly. Inspect the full limit and drive area before ordering only the limit switch assembly.
- MX001777 limit switch - related StrongArm limit switch, not necessarily the complete MX001872 kit.
- MX000299 limit cam - related mechanical cam that actuates the switches, not the same as MX001872.
- MX001100 crankshaft with bearing, zerk and keys - related mechanical drive part, not the limit switch assembly.
- MX000306 4-bolt crankshaft bearing - related bearing support part, not the limit switch assembly.
- MX000077 cylinder assembly - related hydraulic drive component, not the limit switch assembly.
- Controller and wiring components - inspect if limit faults remain after switch and cam hardware are verified.
Technician Note
Before replacing MX001872, inspect the switches, bracket, wiring, connectors, limit cam, cam retaining hardware, crankshaft area, and controller response. A bad limit switch can cause travel issues, but a loose or worn limit cam can create the same symptoms.
If the barrier arm is overtraveling, stopping early, or failing to stop consistently, check the complete limit system before replacing parts. Arm binding, loose crankshaft hardware, worn bearings, hydraulic cylinder movement, controller setup, or incorrect arm balance can all affect where the arm stops.
Before Ordering, Confirm
- The required part number is MX001872.
- The operator is a HySecurity StrongArm / SA application where the parts diagram lists MX001872.
- The repair requires the limit switch assembly or kit, not only the MX001777 standalone limit switch or the MX000299 limit cam.
- The existing limit switch bracket, mounting area, and wiring match the original installation.
- The limit cam is present, secure, and not worn, cracked, or mispositioned.
- The arm is not binding, drifting, overbalanced, underbalanced, or damaged from impact.
- The package includes the expected 2 limit switches, mounting bracket, and hardware.
- The operator has not been modified with non-standard limit hardware or bypassed switch wiring.
Installation and Service Notes
- Secure the barrier arm before servicing limit or drive hardware.
- Disconnect and secure operator power before working near moving mechanical parts or limit switch wiring.
- Do not bypass limit switches, stop circuits, kill switches, or controller protections to keep the operator running.
- Install the limit switch assembly in the correct bracket position and orientation according to the service information.
- Verify the MX000299 limit cam actuates the switches correctly and is not loose or damaged.
- After service, cycle the barrier arm and confirm proper open and close stopping positions.
- Verify smooth arm travel, secure hardware, correct controller response, and all required safety devices.
Professional Advisory
StrongArm limit switch and travel-position repairs should be handled by a qualified gate technician when the repair involves heavy barrier arms, limit switch adjustment, crankshaft hardware, hydraulic movement, controller setup, arm balance, or unknown prior modifications. Do not bypass limit controls, stop circuits, kill switches, controller protections, access control safety inputs, or any required safety devices to keep the operator running.
Product Questions & Answers
What is HySecurity MX001872?
HySecurity MX001872 is a limit switch assembly / limit switch kit for select HySecurity StrongArm barrier gate operator applications.
What operators use MX001872?
HySecurity parts documentation lists MX001872 as the limit switch kit for StrongArm models. Use it only where the operator parts diagram confirms this part number.
What is included with MX001872?
Current listings commonly describe MX001872 as including 2 limit switches, a mounting bracket, and hardware. Package contents should still be verified before ordering.
Is MX001872 the same as MX001777?
Not exactly. MX001777 is listed as a StrongArm limit switch, while MX001872 is listed as a limit switch kit or assembly. Verify whether the repair requires the individual switch or the full assembly.
Is MX001872 the same as the limit cam?
No. MX001872 is the limit switch assembly. The limit cam is a separate mechanical part commonly listed as MX000299.
Can a bad limit switch assembly cause the arm to stop in the wrong place?
Yes. A failed, damaged, loose, or misaligned limit switch assembly can cause early stopping, overtravel, inconsistent stopping, or travel-position problems. The limit cam, wiring, controller response, and arm movement should also be checked.
Should a technician set the limits after replacing this assembly?
Yes. A qualified gate technician should verify switch position, cam actuation, open and close stopping points, controller response, and safe barrier arm operation after replacement.
