Liftmaster CSL24U CSL24V CSL24VDC Gate Parts
LiftMaster CSL24U, CSL24UL, CSL24V & CSL24VDC Replacement Parts
Genuine LiftMaster replacement parts for the CSL24 family of commercial slide gate operators — the 1/2 HP, 24 VDC pad-mount slider with a timing-belt primary drive and a 10:1 gear reducer. Every generation shares the same motor, gear reducer, belt, sprocket, e-box and transformer; they differ only in the control board, expansion board, chassis and cover.
Which generation do I have? Open the e-box and read the main control board:
K1D8389-1CC → CSL24U / CSL24UL (current UL325 generation)
K1D8059-1CC → CSL24VDC
K1D6597-1CC → CSL24V / CSL24VH
Rows below marked with a model name apply only to that generation. Everything else fits all of them.
Covers split three ways. CSL24U takes K77-37852, CSL24UL takes K77-39426, and the CSL24V and CSL24VDC both take K77-37183. The complete cover kit for the CSL24U is K77-37856.
Chassis splits two ways: K73-34718-5 for CSL24U, CSL24UL and CSL24VDC; K73-34718-2 for CSL24V and CSL24VH.
Common CSL24 Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| Motor runs but the gate does not move | Timing belt slipping, glazed or stripped | K16-GT2-7 timing belt, K17-36530 pulley kit |
| Gate runs on mains but dies in a power cut | Batteries at end of life | 29-NP712 battery, K74-30762 pack, K94-37205 harness |
| Gate overruns or stops short | APS encoder not counting | K76-34697 APS encoder kit, K1A6408 APE kit |
| Gate will not reset after an obstruction | Reset switch or its ID resistor | K180A0357 reset switch, K94-36531 kit with resistor |
| Operator dead, no board lights | Transformer, EMI board or bridge rectifier | K204C0211 transformer, K76-34728 EMI board, K52C0481 rectifier |
| Grinding or heavy noise from the drive | Gear reducer or output sprocket worn | K32-34669-1 gear reducer, K15-41B17LKGH output sprocket |
| Belt jumping or chattering under load | Idler pulley worn | K75-50090 idler pulley |
| Chain slack or jumping at the gate | Drive chain stretched | 19-41240D drive chain, 19-50307 master link |
Gate Operator Repair & Service Parts
| Ref | Part # | Description |
|---|---|---|
| 1 | K15-41B17LKGH | Output Sprocket |
| 2 | K32-34669-1 | Gear Reducer, 10:1, #60 |
| 3 | K16-GT2-7 | Timing Belt |
| 4 | K1A6408 | APE Kit, 24V |
| 5 | 29-NP712 | Battery, 12V, 7AH |
| 6 | K94-35152 | Piezo Alarm |
| 7 | K1D8389-1CC | Main Board, DC Pad-Mounts, UL325 — CSL24U / CSL24UL / CSL24ULWK |
| 7 | K1D8059-1CC | Control Board — CSL24VDC |
| 7 | K1D6597-1CC | Control Board — CSL24V / CSL24VH |
| 8 | K1D8387-1CC | Expansion Board, UL325 — CSL24U / CSL24UL / CSL24ULWK |
| 8 | K1D8080-1CC | Expansion Board — CSL24VDC |
| 8 | K1D6686CC | Expansion Board — CSL24V / CSL24VH |
| 9 | K13-34729 | E-Box Cover |
| 10 | K77-36541 | Antenna |
| 11 | K76-34728 | EMI Board with Power Switch |
| 12 | K180A0357 | Reset Switch |
| 13 | K77-36542 | E-Box |
| 14 | K73-34718-5 | Chassis — CSL24U / CSL24UL / CSL24VDC |
| 14 | K73-34718-2 | Chassis — CSL24V / CSL24VH |
| 15 | K204C0211 | Transformer |
| 16 | K52C0481 | Bridge Rectifier Kit |
| 17 | K75-50090 | Idler Pulley, Q013 |
| 18 | K76-36398 | Motor, 1/2 HP, 24 VDC |
| 19 | K10-34758-2 | Heater Battery Bracket |
| 20 | K77-37852 | Cover, Gray — CSL24U |
| 20 | K77-39426 | Cover, Gray — CSL24UL |
| 20 | K77-37183 | Cover — CSL24V / CSL24VDC |
| 21 | K75-36260 | Lock and Keys |
| 22 | K80-50295 | Access Door Keys, Qty 2, Q118 |
Parts Not Shown in Diagram & Accessories
| Ref | Part # | Description |
|---|---|---|
| — | K1D8389-1CCU | Upgrade Kit with Eyes, DC Pad, UL325 |
| — | 77-36764 | Crank Bracket Kit |
| — | K07-50637 | Chain Bolt, Q003 |
| — | K94-34778 | Board to Board Wire Harness, 24V — CSL24U |
| — | K94-36531 | Reset Switch with ID Resistor Kit |
| — | K94-37205 | Battery Harness, 7AH |
| — | K94-36250 | Battery Wire Harness, 7AH — CSL24V / CSL24VDC |
| — | K94-36596 | Battery Wire Harness, 33AH — CSL24V / CSL24VDC |
| — | K80-3001 | Bolt, 5/16"-18 x 32 |
| — | 19-41240D | Drive Chain, #41, 10 ft |
| — | 19-50307 | Master Link, #41 |
Service Kits
| Ref | Part # | Description |
|---|---|---|
| K1 | K17-36530 | Gear Reducer and Motor Pulley Kit |
| K2 | K74-30762 | Battery Pack, 12V, 7AH, Qty 2 |
| K3 | K76-34697 | APS Encoder Kit, 24V |
| K4 | K77-37856 | Cover Kit, Gray — CSL24U |
| K4 | LMWEKITU | Monitored Wireless Edge Kit |