HySecurity MX3684, Gearbox, 3:1, Bevel, Right Angle
The HySecurity MX3684 is a 3:1 right-angle bevel gearbox used with select HySecurity / Nice HySecurity StrongArm M30 and StrongArm M50 no-power hydraulic panel assemblies. This gearbox is part of the mechanical hand-crank drive system used to transfer rotational input through the no-power hydraulic pump arrangement.
Because this part is tied to the StrongArm M30/M50 no-power configuration, it should be verified by operator model, serial number, existing gearbox layout, coupler arrangement, and current HySecurity parts diagram before ordering. A similar-looking right-angle gearbox with the same ratio may still have different shaft dimensions, mounting geometry, coupling style, or load rating.
What This Right Angle Bevel Gearbox Does
The MX3684 gearbox changes the direction of rotational input through a right-angle bevel gear arrangement and provides a 3:1 ratio for the StrongArm no-power hydraulic panel system. In the proper assembly, it works with the hand crank, couplers, pump pack, and manifold components to support manual or no-power operation where the StrongArm system is configured for that feature.
If the gearbox is worn, damaged, binding, stripped, or misaligned, the no-power hand-crank system may become difficult to operate, uneven, noisy, or unable to transfer motion properly to the hydraulic pump arrangement. Gearbox symptoms can also be caused by failed couplers, damaged shafts, pump resistance, hydraulic binding, or incorrect assembly alignment.
Compatible With
This gearbox may be used with the following applications where the current HySecurity parts diagram confirms MX3684:
- Select HySecurity StrongArm M30 no-power applications using the matching hydraulic panel assembly
- Select HySecurity StrongArm M50 no-power applications using the matching hydraulic panel assembly
- StrongArm M30/M50 NP hydraulic panel repairs where the original gearbox is marked, listed, or cross-referenced as MX3684
- No-power hand-crank drive assemblies using the correct 3:1 right-angle bevel gearbox, couplers, and pump pack arrangement
- Applications where the current HySecurity parts diagram lists MX3684 for the gearbox position
Important: This part should not be assumed to fit every StrongArm barrier, every StrongArmPark operator, or every HySecurity gearbox location. MX3684 is specifically associated with StrongArm M30/M50 no-power hydraulic panel applications where the parts diagram confirms fitment.
Similar Parts That Are Not Interchangeable
Gearboxes can look very similar, especially when they share a right-angle layout. However, ratio, shaft size, shaft orientation, mounting pattern, coupler style, gearbox housing, and system load all matter. Do not substitute another gearbox unless the HySecurity parts diagram confirms the same part number or approved replacement.
| Part / Component | Common Description | Interchangeability Note |
| MX3684 | 3:1 right-angle bevel gearbox | Correct gearbox where MX3684 is listed for the StrongArm M30/M50 no-power hydraulic panel |
| MX3691 | 10 inch L square drive hand crank | Related no-power hand-crank component, not the gearbox |
| MX3692 | 5/8 x 5/8 inch keyed coupler | Related coupling component, not the gearbox |
| MX002054 | Motor coupler, 5/8 inch shaft, 6T, new | Related coupler, not the same part as MX3684 |
| Other HySecurity gearboxes | Gearboxes for StrongArmPark, SlideSmart, WedgeSmart, or other operator families | Not interchangeable unless the current parts diagram lists the same part number |
Not Intended For
- StrongArmPark barrier gate operators unless a current HySecurity parts diagram specifically lists MX3684
- SlideSmart, SlideDriver, SwingSmart, SwingRiser, HydraSwing, HydraLift, wedge, bollard, or unrelated operator gearboxes
- StrongArm M30/M50 configurations that do not use the no-power hydraulic panel assembly requiring this gearbox
- Generic industrial right-angle gearbox replacement based only on ratio
- Applications with a different shaft size, coupler style, mounting pattern, or gearbox orientation
- Repairs where the hand crank, coupler, pump pack, manifold, or hydraulic issue is the actual failed component
Important Compatibility Warning
The MX3684 gearbox should be ordered only after confirming the StrongArm no-power hydraulic panel layout. The 3:1 ratio and right-angle bevel style are not enough by themselves to confirm fitment. Shaft size, keyway, couplers, hand-crank interface, pump pack connection, and mounting location all need to match.
If the no-power system is difficult to crank, do not assume the gearbox is the only problem. A seized or damaged pump, incorrect hydraulic valve position, worn coupler, misaligned shaft, damaged hand crank, or hydraulic pressure issue can create symptoms that feel like gearbox failure.
Features & Specifications
| Feature / Specification | Details |
| Manufacturer | HySecurity / Nice HySecurity |
| Part Number | MX3684 |
| Product Type | Right-angle bevel gearbox |
| Gear Ratio | 3:1 |
| Gearbox Style | Bevel, right angle |
| Common Operator Family | Select HySecurity StrongArm M30/M50 no-power hydraulic panel applications |
| Common Description | Gearbox, 3:1, Bevel, Right Angle |
| Related Assembly Area | StrongArm M30/M50 no-power hydraulic panel and hand-crank drive arrangement |
| Package Contents | Gearbox assembly; confirm included oil, shaft keys, couplers, mounting hardware, and current package contents before ordering |
Also Known As / Related Part Numbers
- MX3684
- MX-3684
- HySecurity MX3684
- Nice HySecurity MX3684
- HYS-MX3684
- HYS MX3684
- HySecurity Gearbox, 3:1, Bevel, Right Angle
- HySecurity 3:1 Right Angle Bevel Gearbox
- StrongArm M30/M50 NP Gearbox
- StrongArm No-Power Hydraulic Panel Gearbox
- StrongArm NP M30/M50 Right Angle Gearbox
- MX3691 - related hand crank, not the gearbox
- MX3692 - related keyed coupler, not the gearbox
- MX002054 - related motor coupler, not the gearbox
- MX3689 - related no-power manifold assembly, not the gearbox
- MX3687-01 and MX3687-02 - related pump pack assemblies, not the gearbox
- MX3688-01 and MX3688-02 - related biodegradable pump pack assemblies, not the gearbox
Related Parts and Accessories
- MX3691 hand crank for the StrongArm M30/M50 no-power system where listed
- MX3692 keyed coupler for matching 5/8 x 5/8 inch shaft applications where specified
- MX002054 motor coupler where used in the same no-power hydraulic panel assembly
- MX3689 no-power manifold assembly where hydraulic panel repair is needed
- MX3687-01 or MX3687-02 pump pack assemblies where standard hydraulic pump pack replacement is required
- MX3688-01 or MX3688-02 biodegradable pump pack assemblies where the operator uses biodegradable hydraulic fluid configuration
- Hydraulic valves, fittings, hoses, and fluid service parts where resistance or pump operation is the actual problem
Technician Note
Before replacing the MX3684 gearbox, inspect the complete no-power drive path. A difficult or noisy hand-crank system may be caused by a worn coupler, loose key, damaged shaft, dry or damaged gearbox, hydraulic pump resistance, incorrect valve position, manifold issue, or mechanical binding in the barrier system.
Check for stripped gear teeth, excessive backlash, rough rotation, oil leakage, shaft play, misalignment, and damaged coupler hardware. Also inspect the hand crank and pump input connection. Replacing the gearbox without correcting misalignment or hydraulic resistance can lead to repeat failure.
Before Ordering, Confirm
- The original or required part number is MX3684.
- The operator is a compatible HySecurity StrongArm M30 or StrongArm M50 no-power model.
- The current HySecurity parts diagram lists MX3684 for the gearbox position.
- The gearbox ratio required is 3:1.
- The gearbox is the right-angle bevel style used in the no-power hydraulic panel assembly.
- The shaft size, keyway, couplers, hand-crank interface, and mounting pattern match the existing assembly.
- The problem is not caused by the hand crank, coupler, pump pack, manifold, hydraulic valve, hose, or pressure condition.
- The package contents include the components needed for the repair, or related hardware is being ordered separately.
- The operator has not been modified with non-original gearbox, pump, or coupler hardware.
Installation and Service Notes
- Disconnect power and follow proper lockout procedures before servicing the barrier operator.
- Secure the barrier arm and hydraulic system before removing gearbox, coupler, or pump drive components.
- Mark shaft orientation, coupler position, and hardware locations before disassembly.
- Inspect keys, set screws, couplers, and shafts for wear before installing the replacement gearbox.
- Do not force the hand crank through a binding gearbox, pump, or hydraulic system.
- Use current HySecurity service information for lubrication, mounting hardware, torque, and alignment requirements.
- After installation, confirm smooth hand-crank operation, proper pump response, hydraulic function, and safe barrier movement.
Professional Advisory
The MX3684 is part of the StrongArm M30/M50 no-power hydraulic drive arrangement. Service should be performed by a qualified gate technician if the issue involves heavy barrier movement, hydraulic pressure, pump pack diagnosis, manifold valves, shaft alignment, coupler replacement, gearbox oil leakage, or unknown prior modifications.
Do not bypass hydraulic controls, safety devices, barrier protections, controller functions, fuses, disconnects, or mechanical safeguards to keep the system operating. If the no-power system binds, slips, grinds, or does not move the barrier correctly, the operator should be inspected before continued use.
Product Questions & Answers
What is the HySecurity MX3684 gearbox?
The HySecurity MX3684 is a 3:1 right-angle bevel gearbox used in select StrongArm M30/M50 no-power hydraulic panel applications where the parts diagram confirms this part number.
Is MX3684 used on StrongArm M30 and M50 systems?
Yes, MX3684 is associated with select StrongArm M30/M50 no-power configurations. The exact fit should still be verified by model, serial number, and the current HySecurity parts diagram.
What does a 3:1 right-angle bevel gearbox do?
A 3:1 right-angle bevel gearbox changes the direction of rotational input through a right-angle gear arrangement while providing a 3:1 ratio for the matching mechanical drive system.
Can MX3684 be replaced with a generic right-angle gearbox?
No. A generic gearbox may have the wrong shaft size, keyway, mounting pattern, ratio, load rating, or coupler arrangement. Use the gearbox specified by the HySecurity parts diagram.
What other parts should be checked before replacing MX3684?
Check the hand crank, keyed coupler, motor coupler, pump pack, manifold, shafts, keys, set screws, and hydraulic resistance before replacing the gearbox.
Why is the no-power hand-crank system hard to turn?
A hard-to-turn hand-crank system can be caused by gearbox wear, a damaged coupler, shaft misalignment, hydraulic pump resistance, incorrect valve position, manifold issues, or mechanical binding in the barrier system.
Should a technician install the MX3684 gearbox?
Yes, this repair should be handled by a qualified gate technician when the work involves hydraulic components, heavy barrier movement, shaft alignment, couplers, pump drive parts, or an unsafe operator condition.
