LiftMaster Mega Arm Replacement Parts
Genuine replacement parts for the LiftMaster Mega Arm barrier gate, including the MA, MAT and MATTS tower models. Each section has its own diagram and its own numbering — find your part on the drawing, then click the part number in the table below it.
Arm broken? Barrier arms are consumable — they are meant to break rather than damage the operator or the vehicle. Skip to the
arm selection table below and match your length and finish. Check the
MA013 shear pin at the same time; it usually goes with the arm.
Operator Assembly
| Ref |
Part Number |
Description |
| 1 |
MA001 |
Control board, MA and MAT (K79-60166) |
| 2 |
MA002 |
Limit switch assembly |
| 3 |
MA003 |
Motor, 1/2 HP 24VDC |
| 4 |
MBAT |
Battery, Yuasa NP7-12 |
| 5 |
MA005 |
Gear reducer, 60:1 |
| 6 |
MA006 |
Pedestal / base |
| 7 |
MA007 |
Drive belt, 4L290 (AX27) |
| 8 |
MA008 |
Pulley, gear reducer 8" |
| 9 |
MA009 |
Motor pulley, 1.5" |
| 10 |
MA010 |
Gate arm bracket |
| 11 |
MA011 |
Magnet |
| 12 |
MA012 |
Cam arm |
| 13 |
MA013 |
Shear pin #6 — the sacrificial part that breaks before the gearbox does |
| 20 |
MA036 |
Shaft collar |
| 21 |
MA031 |
Arm adaptor collar, 2 pack |
Tower Assembly
| Ref |
Part Number |
Description |
| 14 |
MA014 |
Mounting hardware |
| 15 |
MA015 |
Transformer, 24V |
| 19 |
MA019 |
Tower internal bracket |
| — |
MA020T |
Cover, Mega Arm tower |
| — |
MA020D |
Tower door |
| — |
MA020 |
Cover, Mega Arm — no longer available. The MA020T above is the tower cover and is not a direct substitute |
Which Barrier Arm Do I Need?
Match the length to your lane width, then the finish. Arms over 12 ft need a counterweight.
Arm Hardware & Counterweights
| Part Number |
Description |
| MA117 |
Counterweight — required on 17 ft arms |
| MALEDCW |
Counterweight for the 17 ft LED arm |
| MA033 |
Hardware kit, articulating arm only |
| MA031 |
Arm adaptor collar, 2 pack |
| MA021 |
Nylon arm nuts, 50 pack |
| MA022 |
Arm bolt, set of 2 |
| MA013 |
Shear pin #6 |
Motor, Gearbox & Brushes
| Part Number |
Description |
| MA003 |
Motor, 1/2 HP 24VDC |
| MA003B |
Brushes, B series motors |
| MA003E |
Brushes, E series motors |
| MA003C |
Brushes, C series motors — no longer available |
| MA005 |
Gear reducer, 60:1 |
| MA005A |
Gear box with clutch |
| MA005C |
Slip clutch option |
Check the brushes before replacing the motor. Brush series is stamped on the motor housing — B, C or E. A set of brushes is a fraction of the cost of a new motor and fixes most "runs slowly or intermittently" faults.
Boards, Options & Accessories
