Mighty Mule FM502 Replacement Alarm Buzzer
This Mighty Mule alarm buzzer is the replacement audible alert part used on the FM502 swing gate operator. The buzzer is there to warn the user when the control system is reporting an alarm or service condition. While it is a small component, it should be treated as part of the operator alert system, not as a nuisance part to bypass. Customers commonly replace it when the buzzer housing is damaged, the terminals are corroded, the sounder has failed, or the control box is being restored with correct service parts. If an operator is beeping repeatedly, the buzzer is usually reporting a condition rather than causing it.
Common alarm-related complaints can be caused by low battery voltage, charging problems, gate obstruction, force/limit issues, damaged wiring, or control board faults. Replace the buzzer only after confirming the alarm output and wiring are correct.
Compatible With
This alarm buzzer is tied most directly to these applications:
- Mighty Mule FM502 swing gate operator
- FM502 control box alarm buzzer replacement
- Mighty Mule FM502 R4690 loaded control box related service reference
- Compatible systems using the same FM502 alarm buzzer part and wiring style when confirmed by parts diagram
- Not a universal buzzer for every Mighty Mule, GTO, or Linear control board
Features & Specifications
| Manufacturer | Linear / Mighty Mule / GTO |
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| Product Type | Replacement alarm buzzer |
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| Part Number | Alarm |
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| Related Listed Part Number | LIN-Alarm |
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| Application | Audible alarm buzzer for compatible FM502 operator control box service |
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| Compatible Operator Type | Mighty Mule FM502 swing gate operator |
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| Safety Monitoring | Audible warning / alarm alert component |
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| Notes | Do not bypass alarm or safety-alert components |
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Also Known As / Related Part Numbers
Related names and search references include:
- Alarm
- LIN-Alarm
- Mighty Mule Alarm
- Mighty Mule Replacement Alarm
- Mighty Mule FM502 Alarm Buzzer
- FM502 replacement buzzer
- FM502 audible alarm
- R4690 loaded control box alarm component
Technician Note
If the alarm is sounding, diagnose why the control board is commanding the alarm before replacing the buzzer. Silencing or bypassing the buzzer can hide a real gate safety or charging issue.
Before Ordering
- Confirm the part is for an FM502 control box.
- Check whether the buzzer is failed or the control board is actively commanding an alarm.
- Inspect low-voltage wires and terminals for corrosion.
- Check battery and charging circuit condition if the operator is repeatedly beeping.
- Do not bypass the buzzer to quiet an unresolved fault.
Important Ordering Warnings
Audible alarm components are part of the operator alert system. Do not bypass or disable the alarm to keep a gate running with unresolved safety or obstruction issues.
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 does this replacement alarm buzzer do?
It provides the audible alarm sound when the compatible FM502 control system calls for an alert condition.
Will replacing the buzzer stop a beeping problem?
Only if the buzzer itself is defective. If the control board is commanding the alarm, the underlying battery, charging, obstruction, wiring, or board issue must be corrected.
Is this alarm buzzer compatible with every Mighty Mule opener?
No. It is listed for FM502 service and should be matched by parts diagram before use on other models.
Can the gate opener be run with the alarm disconnected?
No. The alarm should not be bypassed or disabled to ignore a fault condition.
What should be checked when the alarm keeps sounding?
Check battery voltage, charging input, gate movement, obstruction conditions, wiring, and board status before assuming the buzzer is the failed part.
