Liftmaster MSWDCBB Swing Gate Parts
LiftMaster MSWDCBB Replacement Parts
Genuine LiftMaster replacement parts for the MSWDCBB Mega Swing gate operator — the 1/2 HP, 24 VDC battery-backup swing operator driving the gate through a 900:1 double-reduction gear box and a jointed arm. Use the diagram above to find the key number for the part you need, then click any part number in the tables below.
Match the motor brushes to your motor series. The brushes are not interchangeable — MA003B, MA003C and MA003E fit the B, C and E series motors respectively. The series letter is on the motor label.
Straight or swivel arm? The standard build uses the SW021A primary arm with the SW22A secondary tube. Where the post geometry will not allow a straight run, use the SW022SW swivel arm instead.
Shares its control board with the Mega Slide. The K79-60142 board and K-127A0112B chip are common to the MSWDCBB and the MSLDCBB and MSLXDCBB sliders.
This is an older Mega platform and several parts are discontinued. Where a part number appears without a link, LiftMaster no longer supplies it and there is no direct replacement.
Common MSWDCBB Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| Motor runs but the gate barely moves | Drive belt slipping or glazed | SW007 belt, SW008 and SW009 pulleys |
| Gate overruns or stops short | Limit cams or limit switch | SW012 limit cams, MS044 limit switch |
| Operator dead, nothing at all | Breaker switch, transformer or on/off switch | MS351 breaker, MS015 transformer, K23-20088 switch |
| Intermittent operation, motor sparking | Motor brushes worn — match your motor series | MA003B, MA003C, MA003E brushes |
| No response to remotes or inputs | Control board or its programming chip | K79-60142 control board, K-127A0112B chip |
| Grinding or heavy noise from the gear box | Gear reducer worn | SW005 gear reducer, 900:1 |
| Play or knocking at the arm | Arm ends, set screws or washers worn | SW22B arm end, SW22E set screws, SW22F washer kit |
| Cannot release the gate by hand | Release pin or arm clamp | SW020 release pin, SW019C mounting plate arm clamp |
Gate Operator Repair & Service Parts
| Ref | Part # | Description |
|---|---|---|
| 1 | K79-60142 | Control Board, MSL / MSW |
| 1 | K-127A0112B | Chip, Mega Slide and Swing |
| 2 | MA003 | Motor, 1/2 HP, 24 VDC, BM |
| 3 | SW005 | Gear Reducer, 900:1, Double Reduction |
| 4 | SW006C | Chassis for Swing Gate — no longer available |
| 5 | SW007 | Belt, 4L210 |
| 6 | SW008 | Reducer Pulley, 2", 5/8" Bore |
| 7 | SW009 | Motor Pulley, 2" |
| 8 | MS351 | Breaker Switch, 10A |
| 9 | SW012 | Limit Cam, Qty 2 |
| 10 | SW013 | Alarm, 100dB — no longer available |
| 11 | MS015 | Transformer, 110/220V, 24VAC — no longer available |
| 12 | K23-20088 | On/Off Switch, 120VAC, 15A |
| 13 | SW019C | Mounting Plate Arm Clamp |
| 14 | SW020 | Release Pin |
| 15 | MS044 | Limit Switch — no longer available |
Arm Assembly (A)
| Ref | Part # | Description |
|---|---|---|
| A1 | SW021A | Primary Arm |
| A2 | SW21B | Elbow Bolt and Nut Kit |
| A3 | SW22A | Secondary Arm Tube |
| A4 | SW22B | Arm End |
| A5 | SW22C | Gate Plate Bolt and Nut Kit |
| A6 | SW22D | Gate Plate Kit |
| A7 | SW22E | Set Screws — no longer available |
| A8 | SW22F | Nylon Washer Kit |
Parts Not Shown in Diagram
| Ref | Part # | Description |
|---|---|---|
| — | MA002 | Connector, 12 Pin |
| — | SW011 | Access Window |
| — | SW024 | Operator and Cover Arm, MSWDCBB |
| — | SW025 | Cover, MSWDCBB |
| — | SW022SW | Swivel Arm for Swing Gate |
| — | MA003B | Motor Brushes, Series B Motor |
| — | MA003C | Motor Brushes, Series C Motor |
| — | MA003E | Motor Brushes, Series E Motor |