Liftmaster MA005A, GEAR BOX WITH CLUTCH
The LiftMaster MA005A gearbox with clutch is a major drivetrain service part for Mega Arm style barrier gate operators. In a barrier arm operator, the gearbox reduces motor speed and increases usable torque so the arm can raise and lower smoothly under repeated traffic cycles. The integrated clutch provides mechanical overload protection and helps reduce damage when the arm is obstructed, hit, or forced. MA005A is commonly associated with LiftMaster Mega Arm, Mega Arm Tower, and Mega Arm Sprint Tower service applications, including MADCBB, MATDCBB, and MASTDCBB references where confirmed by the parts diagram. A worn gearbox may show grinding, slipping, excessive play, weak arm movement, oil leakage, or inconsistent stopping. Because this is a drivetrain component, arm balance, springs, belt, pulley, and clutch setup should be checked during replacement.
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Gearbox with integrated clutch |
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| Part Number | MA005A |
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| Application | Mega Arm barrier gate drivetrain service |
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| Gear Ratio | Common reference: 60:1 |
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| Compatible Operator Type | Barrier gate operator |
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| Notes | Verify Mega Arm model and parts diagram |
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Compatible With
- LiftMaster Mega Arm barrier gate operators where MA005A is specified
- LiftMaster MADCBB Mega Arm applications where confirmed
- LiftMaster MATDCBB Mega Arm Tower applications where confirmed
- LiftMaster MASTDCBB / Mega Arm Sprint Tower applications where confirmed
- Select LiftMaster commercial barrier gate operator systems requiring MA005A gearbox with clutch
Also Known As / Related Part Numbers
- MA005A
- MA-005A
- MA 005A
- MA005
- MA-005
- Mega Arm gearbox
- Mega Arm gear box with clutch
- 60:1 gear box
- 60:1 gearbox
Technician Note
Before condemning the gearbox, inspect the arm balance, springs, belt, pulleys, motor output, and clutch adjustment. A jammed or poorly balanced arm can quickly damage a new gearbox.
Before Ordering Checklist
- Confirm the operator is a Mega Arm / Mega Arm Tower style barrier operator.
- Match MA005A to the original gearbox part number.
- Check arm springs, belt, pulleys, and motor before installation.
- Inspect for frame damage or bent arm hardware.
- Test arm travel, clutch function, and safety operation after repair.
Important Ordering Warnings
- Do not substitute for non-Mega Arm gearboxes by appearance.
- Secure the barrier arm before drivetrain service.
Professional Advisory
Barrier gate drivetrain repairs involve stored spring energy and moving arm hazards. Secure the arm and follow the operator manual before servicing the gearbox or clutch.
Product Questions and Answers
What operators use MA005A?
MA005A is commonly associated with LiftMaster Mega Arm, Mega Arm Tower, and Mega Arm Sprint Tower barrier gate operator applications.
Is MA005A the same as MA005?
MA005A is commonly treated as the gear box with clutch version and may be related to older MA005 gearbox references. Verify the exact parts diagram before substitution.
What symptoms point to gearbox trouble?
Grinding, slipping, excessive arm play, weak movement, oil leakage, or irregular arm travel can point to gearbox wear.
Can this be used on slide gate operators?
No confirmed slide gate compatibility should be assumed. It is primarily a Mega Arm barrier gate drivetrain part.
Should arm balance be checked when replacing it?
Yes. A poorly balanced or damaged arm assembly can overload the gearbox and cause repeat failure.
