Liftmaster MSLDCBB & MSLXDCBB Slide Gate Parts
LiftMaster MSLDCBB & MSLXDCBB Replacement Parts
Genuine LiftMaster replacement parts for the MSLDCBB and MSLXDCBB Mega Slide gate operators — the 1/2 HP, 24 VDC battery-backup sliders with a 10:1 gear reducer and belt-to-chain drive. Use the diagrams above to find the key number for the part you need, then click any part number in the tables below to go straight to that product.
Both models share the same running gear. The MSLDCBB and MSLXDCBB use identical motors, gear reducers, belts, pulleys, sprockets, boards and limits — only the enclosure differs, so the diagram shows both.
The only part that differs is the cover: MSLDCBB takes MS020, MSLXDCBB takes MSX024. Everything else on this page fits either.
This is an older Mega Slide platform and a number of its parts are discontinued. Where a part number appears without a link, LiftMaster no longer supplies it and there is no direct replacement.
Common Mega Slide Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| Motor runs but the gate barely moves | Drive belt slipping or glazed | MS007 drive belt, MS010 and MS009 pulleys |
| Gate runs past its stopping point | Limit nuts drifting or limit switch failed | MS043 limit nuts, 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 |
| Chain jumping or noisy drive | Worn drive sprocket or idler pulley | MS041 sprocket kit, MS040 idler pulley kit |
| No response to remotes or inputs | Control board or its programming chip | K79-60142 control board, K-127A0112B chip |
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 | MS005 | Gear Reducer, 10:1 |
| 4 | 09-60017 | Chassis, Mega Slide — no longer available |
| 5 | MS007 | Drive Belt |
| 6 | MS010 | Reducer Pulley, 5" |
| 7 | MS009 | Motor Pulley, 2" |
| 8 | MS351 | Breaker Switch, 10A |
| 9 | MS041 | Drive Sprocket Kit |
| 10 | MS043 | Limit Nuts, Qty 2 |
| 11 | MS013 | Detent Plate |
| 12 | MS015 | Transformer, 110/220V, 24VAC |
| 13 | MS040 | Idler Pulley Kit |
| 14 | MS044 | Limit Switch |
| 15 | MS202 | Drive Chain, #4, NP |
| 15 | MS202SS | Drive Chain, #41, SS |
| 16 | K23-20088 | On/Off Switch, 120VAC, 15A |
Parts Not Shown in Diagram
| Ref | Part # | Description |
|---|---|---|
| — | K073A0003 | Line Filter |
| — | K74-33888 | MOV, 300V |
| — | MA002 | Connector, 12 Pin |
| — | MA003B | Motor Brushes, Series B Motor |
| — | MA003C | Motor Brushes, Series C Motor |
| — | MA003E | Motor Brushes, Series E Motor |
| — | MS020 | Cover — MSLDCBB |
| — | MSX024 | Cover — MSLXDCBB |
| — | MS023 | Plexi Window with Bend — no longer available |