Liftmaster HDSL24UL Slide Gate Parts
LiftMaster HDSL24UL Replacement Parts
Genuine LiftMaster replacement parts for the HDSL24UL heavy-duty slide gate operator — the 24 VDC brushless variable-speed slider built for high-cycle Class III and IV sites, with battery backup and a 39:1 gear reducer. Use the exploded diagram 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.
One build only. Unlike the AC pad-mount operators, the HDSL24UL ships in a single 24 VDC configuration — there are no voltage or phase variants to match, so every part on this page fits every HDSL24UL.
Shares parts with the HDSW24UL swing operator: the boards, motor, motor drive, transformer, bridge rectifier, EMI board and batteries are common to both. Parts named "HD Gates" fit either; parts named "HDSL24UL" or "HD Slide" are slide-specific.
Common HDSL24UL Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| Gate runs on mains but dies in a power cut | Backup batteries at end of life | 29-NP712 battery, K74-30762 battery pack |
| Gate will not reset after hitting an obstruction | Reset switch or its ID resistor | K41-0048-000, K41-0081-000 interlock reset switch |
| Operator dead, no lights on the board | Transformer, bridge rectifier or power switches | K41-0067-000, K41-0083-000, K41-0123-000 |
| Gate creeps past its stopping point | Limits drifting on the reduction chain | K41-0056-000 limit chain, K41-0053-000 limit base |
| Grinding or chatter from the drive | Worn sprocket or idler pulleys | K41-0063-000 drive sprocket, K41-0118-000 idler pulleys |
| Motor hums but the gate will not move | Gear reducer or motor drive board | K41-0062-000 gear reducer, K41-0095-000 motor drive |
Gate Operator Repair & Service Parts
| Ref | Part # | Description |
|---|---|---|
| 1 | K41-0118-000 | Idler Pulley, Qty 2, HD |
| 2 | K41-0071-000 | HD Power Board |
| 3 | K41-0073-000 | HD Main Control Board |
| 4 | K41-0075-000 | Dust Guard, HD Slide |
| 5 | K41-0051-000 | APE HD Slider |
| 6 | K41-0067-000 | Transformer, HD Swing and Slide |
| 7 | K1D7078 | EMI Board |
| 8 | K41-0072-000 | Relay Adapter Board, HD |
| 9 | K1D8387-1CC | Expansion Board, UL325 |
| 10 | K41-0068-000 | Alarm, HD Gates |
| 11 | K41-0053-000 | Limit Base Assembly, HD Slider |
| 12 | K41-0063-000 | Drive Sprocket, HD Slide |
| 13 | K41-0056-000 | Limit Reduction Chain, HD Slider |
| 14 | K41-0074-000 | Control Board Pivot Bracket and Slide |
| 15 | K41-0083-000 | Bridge Rectifier, HD Gates |
| 16 | 29-NP712 | Battery, 12V, 7AH |
| 17 | K74-30762 | Battery Pack, 12V, 7A, Qty 2 |
| 18 | K41-0062-000 | Gear Reducer, 39:1, HDSL24UL |
| 19 | K80-50142 | Lock and Keys |
| 20 | K41-0055-000 | Cover, HDSL24UL |
| 21 | K41-0095-000 | Motor Drive, HD Gates |
| 22 | K41-0082-000 | HD Motor |
| 23 | K41-0081-000 | Interlock Reset Switch, HD Gates |
| 24 | K41-0079-000 | Gear Box Disconnect, HDSL24UL |
Parts Not Shown in Diagram
| Ref | Part # | Description |
|---|---|---|
| — | K41-0078-000 | EMI Board with Cover Kit, HD Gates |
| — | K41-0047-000 | Wire Harness Kit, HD Gates |
| — | K41-0048-000 | Reset with ID Resistor, HD Gates |
| — | K41-0123-000 | Power Switches and Wire Harness, HD |
| — | K94-34778 | Board to Board Wire Harness, 24V |
| — | 19-40240D | Drive Chain, #40, 10 ft, Hardware Kit |
| — | K07-50637 | Chain Bolt, Q003 |
| — | K41-0105-000 | Battery Tray, 33AH, HD |