Product Overview
The R4690 loaded control box is the assembled control box used to restore compatible Mighty Mule FM500 control systems when a bare board is not enough. On a single swing gate installation, the control box manages battery power, charging input, receiver operation, arm output, alarm signaling, and accessory wiring. If the original box has water damage, lightning damage, corrosion, broken standoffs, missing cover hardware, or multiple failed internal parts, replacing the loaded box can be cleaner than rebuilding the enclosure one piece at a time. Correct fitment is important because the box must match the FM500 wiring layout and the R4211 control board family.
The FM500 and FM502 product rows share the R4690 part family, but single and dual gate configurations should not be casually mixed. Confirm whether the installation is a single FM500 system or a dual FM502 system before transferring wires or ordering replacement controls.
Compatible With
This R4690 loaded control box is commonly associated with the following FM500 and related control-board applications:
- Mighty Mule FM500 single swing gate operator loaded control box replacement
- Mighty Mule FM500 systems using the R4211 control board family
- Related FM500 / FM502 R4690 loaded control box references when the configuration matches
- R4211 board family compatibility references: FM500, FM502, MM560, MM562, MM600, and MM660
- Related GTO / Linear Pro 2500 series references where R4690 loaded boxes are listed
- Select PRO-SW2500 / PRO-SW2502 and related GTO/Linear Pro references only when enclosure and wiring configuration are confirmed
Features & Specifications
| Manufacturer | Linear / Mighty Mule / GTO |
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| Product Type | Loaded control box assembly |
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| Part Number | R4690 |
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| Application | Replacement loaded control box for compatible FM500 control systems |
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| Compatible Operator Type | Select battery-backed swing gate opener control systems |
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| Included Components | Control board, receiver, battery harness, alarm, on/off switch, strain relief, PCB standoffs, and cover screws as commonly listed |
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| Related Board | R4211 control board family |
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| Notes | Match FM500 single-gate configuration before ordering |
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Also Known As / Related Part Numbers
Related numbers and common search references include:
- R4690
- LIN-R4690
- GTO R4690
- Mighty Mule R4690
- FM500 R4690 loaded control box
- R4690 loaded box
- Loaded control box with R4211 board
- R4211 control board
- FM500 loaded control box
- Mighty Mule FM500 control box
- Related to FM502 R4690 but must match configuration
Technician Note
Do not use a loaded box replacement to mask gate mechanical problems. A dragging gate, weak hinge, bad battery, or failed transformer can damage or stress the new control system if the underlying problem remains.
Before Ordering
- Confirm the operator is an FM500 single swing gate system.
- Compare enclosure, harness, receiver, switch, and accessory wiring layout.
- Confirm the existing board family and part references.
- Test the battery and charging transformer before replacing the control box.
- Plan to reprogram remotes and retest limit/force behavior after service.
Important Ordering Warnings
Single-gate and dual-gate control setups can have different wiring requirements. Match the loaded box to the actual operator configuration before installation.
Professional Advisory
Gate opener service can involve stored gate force, moving arms, batteries, and low-voltage control wiring. If the operator is moving unexpectedly, has damaged wiring, or has missing required safety devices, have the system inspected by a qualified gate technician before returning it to service.
Product-Specific Q&A
What problem does an R4690 loaded control box solve?
It is used when the control box assembly or multiple internal parts are damaged, missing, corroded, or no longer reliable.
Is this row written for the FM500 operator?
Yes. This version is written for the FM500 single swing gate operator application.
Is R4690 the same as a bare R4211 board?
No. R4211 is the control board family. R4690 is a loaded control box assembly that commonly includes the board and other control box components.
Can I use the FM502 version on an FM500 system?
Do not assume interchangeability by name alone. Match the loaded box configuration, wiring layout, and operator setup before ordering.
Should the transformer and battery be checked first?
Yes. Charging or battery problems can mimic control box failure and can also damage a replacement control system if left unresolved.
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