Mighty Mule FM500 Replacement Alarm - Buzzer
The Mighty Mule replacement alarm buzzer is the audible warning component used inside compatible FM500 and FM502 style control boxes. On these gate operators, the control board can use an audible alarm to warn of certain fault, obstruction or entrapment-related conditions. The buzzer is a small part, but it is tied to an important safety function. Replacement is usually considered when the buzzer is physically broken, silent when it should sound, weak, corroded, or damaged during control box service. It should not be replaced as a shortcut for a gate that is alarming because of a real operating problem. If the opener is beeping, stopping, reversing, or showing low battery behavior, the battery, transformer, control board, actuator wiring, obstruction sensitivity, gate movement and safety devices should be checked before assuming the buzzer is the only issue.
Compatible With
- Mighty Mule FM500 replacement alarm / buzzer applications.
- Mighty Mule FM502 replacement alarm / buzzer applications.
- Commonly associated with FM500 and FM502 control box service parts and R4690 loaded control box component references.
- May apply to related Mighty Mule / GTO control boxes only when the original buzzer style and connector match.
- Verify by control box layout, original buzzer type and operator parts diagram.
Features & Specifications
| Manufacturer | Linear / GTO / Mighty Mule |
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| Product Type | Replacement alarm buzzer |
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| Part Number | Alarm / buzzer service reference |
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| Application | Audible warning component for compatible gate opener control boxes |
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| Compatible Operator Type | Select Mighty Mule swing gate operator control boxes |
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| Related Assembly | R4690 loaded control box references may include alarm component in some listings |
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| Safety Function | Audible alert for control-board alarm conditions |
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| Notes | Do not bypass or disable required warning or safety functions |
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Also Known As / Related Part Numbers
- Mighty Mule alarm buzzer
- FM500 replacement alarm
- FM502 replacement alarm
- FM500 buzzer
- FM502 buzzer
- Gate opener alarm buzzer
- Entrapment alarm buzzer
- R4690 alarm component reference
Technician Note
A continuously beeping opener often points to a system condition, not just a bad buzzer. Diagnose battery condition, charge voltage, obstruction issues and board condition before replacing the alarm part.
Before Ordering Checklist
- Confirm the operator model and control box layout.
- Check whether the buzzer is physically damaged or disconnected.
- Test battery and charging system if the opener is beeping or showing low battery symptoms.
- Inspect the board and control box for water, insects or corrosion.
- Do not disconnect the alarm to silence a safety-related fault.
Important Ordering Warnings
- Do not bypass or remove alarm functions to keep the gate operational.
- A replacement buzzer will not correct a low battery, obstruction problem, failed board, or unsafe gate condition.
Professional Advisory
Audible warning devices are part of the operator safety system. If the gate is alarming, reversing unexpectedly, or moving unsafely, stop using the operator until the fault is corrected.
Product Questions & Answers
What does the Mighty Mule replacement alarm buzzer do?
The alarm buzzer provides an audible warning tied to the operator control board, including entrapment alarm behavior on compatible FM500 and FM502 style systems.
Will replacing the buzzer fix a beeping gate opener?
Only if the buzzer itself is failed or physically damaged. Beeping can also be caused by low battery, obstruction, control board faults or safety-related conditions.
Is this buzzer used on FM500 and FM502 systems?
It is commonly listed under FM500 and FM502 replacement parts. Match the original buzzer connection and control box layout before ordering.
Can I disconnect the buzzer to stop the noise?
Do not disable safety warning devices to keep the gate running. Find and correct the cause of the alarm or have the operator serviced.
What should be checked before replacing the alarm?
Check battery voltage, obstruction history, wiring, board condition, moisture inside the control box and whether the alarm is responding to a real fault condition.
