Liftmaster SW019C, MOUNTING PLATE ARM CLAMP
The LiftMaster SW019C Mounting Plate Arm Clamp is a genuine-style replacement part used in the LiftMaster Mega Swing / MSWDCBB commercial swing gate operator family. This mounting plate and clamp assembly provides the fixed interface where the Mega Swing arm assembly attaches to the operator-side structure. A worn or bent clamp can create movement in the linkage, which may show up as clunking, uneven travel, or changing open and close positions.
Mega Swing operators use a specific arm and enclosure layout, so small pieces such as bolts, washers, plates, arm ends, and windows are not generic hardware. Correct geometry is important because the arm assembly transfers the operator force into the moving gate. If the wrong part is installed, the gate may bind, pull unevenly, damage the arm, or place extra load on the operator gearbox and motor.
This part should be matched by the original part number and the MSWDCBB parts diagram. It is especially important on older or high-cycle gate systems where worn bushings, loose bolts, bent plates, or gate hinge problems may have caused the original component to fail.
Compatible With
These parts are primarily for LiftMaster Mega Swing MSWDCBB / Mega Swing UL commercial-duty swing gate operators and related arm or enclosure assemblies that call out the exact part number.
- LiftMaster MSWDCBB Mega Swing UL commercial-duty swing gate operators.
- Mega Swing perimeter access swing gate operator parts diagrams that list the exact SW part number.
- SW-ARMKIT complete arm kit references where the matching subcomponent is included.
- SW021 primary arm and SW022 secondary arm assemblies where the diagram identifies the related subpart.
- Older Mega Swing / MSWDCBB service documentation using SW-prefix mechanical part numbers.
- MSWDCBB diagrams that list SW019 as the arm mounting plate and identify the plate with clamp as SW019C.
Features and Specifications
| Manufacturer | LiftMaster |
|---|
| Product Type | Arm mounting plate with clamp |
|---|
| Part Number | SW019C |
|---|
| Application | LiftMaster Mega Swing / MSWDCBB service part |
|---|
| Compatible Operator Type | Commercial-duty swing gate operator |
|---|
| Associated Assemblies | SW-ARMKIT, SW021 primary arm, SW022 secondary arm, or MSWDCBB enclosure as applicable |
|---|
| Notes | Verify exact part number and parts diagram before ordering |
|---|
| Function | Arm mounting plate and clamp interface |
|---|
| Installation Location | Operator-side arm mounting area |
|---|
| Related Assembly | Mega Swing arm mounting hardware |
|---|
Also Known As / Related Part Numbers
- SW019C
- SW019
- LM-SW019C
- Arm mounting plate
- Mounting plate with clamp
- Arm clamp mounting plate
Technician Note
After replacing an arm clamp or mounting plate, verify the gate arm geometry and travel. Loose or misaligned mounting hardware can let the arm shift under load and can damage the replacement clamp.
Before Ordering
- Confirm the installed operator is a LiftMaster Mega Swing / MSWDCBB style unit.
- Match the exact SW part number from the parts diagram.
- Inspect the arm assembly and gate hinges for binding before replacing hardware.
- Do not substitute ordinary hardware for load-bearing arm parts unless the manufacturer documentation allows it.
- Make sure all required gate safety devices remain installed and working after service.
Important Ordering Warning
Several Mega Swing SW-prefix parts are similar in name but not interchangeable. Match the exact part number, location, and assembly before ordering.
Professional Advisory
Gate operator mechanical and electrical parts should be serviced with the operator powered down and secured against unexpected movement. If the gate is binding, moving unevenly, missing required safety devices, or showing electrical damage, have the system inspected by a qualified gate technician before replacing parts.
Product Questions and Answers
What is the LiftMaster SW019C used for?
The LiftMaster SW019C is used as an arm mounting plate with clamp for the Mega Swing arm connection on compatible LiftMaster Mega Swing / MSWDCBB swing gate operator assemblies.
Which operator is SW019C most commonly associated with?
It is most commonly associated with the LiftMaster MSWDCBB Mega Swing UL commercial-duty swing gate operator and related Mega Swing arm or enclosure parts diagrams.
Can SW019C be used as a universal swing gate part?
No. This is an OEM-style LiftMaster service part and should only be used where the operator parts diagram calls out the exact part number or assembly.
How should fitment be verified for SW019C?
Verify the operator model, compare the installed component, and check the Mega Swing parts diagram before ordering. Similar SW-prefix parts can look related but serve different functions.
What else should be inspected when replacing SW019C?
Inspect the surrounding arm, brackets, pivot hardware, bushings, fasteners, enclosure, and gate movement. A worn linkage or misaligned gate can damage a new part quickly.
