NICE / APOLLO MX3903, Slow Speed Drive Kit
The NICE HySecurity MX3903 is a slow speed drive kit for compatible SwingSmart DC swing gate operators. It is used when the installed gate needs reduced operating speed instead of the standard faster motion. This can be helpful on larger or heavier swing gates, gates that see wind pressure, or sites where smoother controlled gate travel is preferred over speed. The kit changes the mechanical drive relationship through service parts such as the pulley and belt, so it should be treated as an operator-specific drive modification rather than a general tune-up item.
Before installing this kit, the gate should swing freely by hand and the operator geometry should be checked. If the gate is dragging, binding, sagging, or hitting a stop incorrectly, slowing the drive will not solve the root problem. The MX3903 is best used when the operator and gate are otherwise in good condition but the application calls for a slower open/close cycle.
Compatible With
Commonly listed for the HySecurity SwingSmart DC swing gate operator. Public references describe MX3903 as a SwingSmart DC slow down or slow speed drive kit. Do not assume compatibility with SlideSmart, SwingSmart CNX, legacy Apollo linear actuators, or other Nice Apollo systems unless the current operator manual or parts diagram specifically lists MX3903.
Features and Specifications
| Manufacturer | Nice HySecurity / NICE Apollo |
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| Product Type | Slow speed drive kit |
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| Part Number | MX3903 |
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| Application | Reduces operating speed on compatible SwingSmart DC operators |
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| Compatible Operator Type | Select SwingSmart DC swing gate operators |
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| Included Components | Common references include pulley, drive belt, and Loctite |
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| Operating Effect | Commonly referenced to slow operation to about 15-22 seconds, depending on installation |
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| Notes | Not a repair for gate binding, poor hinges, or incorrect arm geometry |
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Also Known As / Related Part Numbers
- MX3903
- HYS-MX3903
- HYP-MX3903
- SwingSmart DC Slow Down Kit
- SwingSmart DC Slow Speed Drive Kit
- HySecurity Slow Speed Drive Kit
Technician Note
Inspect the gate hinges, arm geometry, stops, belt condition, and obstruction sensitivity before installing a slow speed kit. If the gate is mechanically overloaded, repair the gate first.
Before Ordering
- Confirm the operator is a compatible SwingSmart DC model.
- Verify the kit is appropriate for the desired open/close speed.
- Check whether the operator already has a slow speed configuration installed.
- Do not order this kit to compensate for a dragging or damaged gate.
- Plan for final limit, speed, and obstruction checks after installation.
Professional Advisory
Power must be turned off before service. A qualified gate technician should install and test this kit because it affects operator drive performance and safety response.
Product Questions and Answers
What does the MX3903 slow speed drive kit do?
The MX3903 kit slows a compatible SwingSmart DC operator to a lower operating speed, commonly used on heavier gates or gates exposed to higher wind load.
What parts are included in the MX3903 kit?
Common kit references include a gearbox pulley, drive belt, and Loctite. Confirm current package contents before ordering.
Is MX3903 for SlideSmart operators?
Public kit references identify MX3903 primarily as a SwingSmart DC slow speed drive kit. Do not assume SlideSmart compatibility unless the operator parts documentation confirms it.
Will this fix a gate that is binding?
No. The kit may help applications that need slower motion, but it will not correct bad hinges, a dragging gate, poor geometry, or a failing gearbox.
Should a technician install this kit?
Yes. The kit changes the operator drive setup and requires power shutdown, cover removal, pulley/belt work, and final operator testing.
