Genuine LiftMaster K76-36398 gate operator motor — the 1/2 HP, 24 VDC drive motor for LiftMaster's CSL24 slide and CSW24 swing commercial gate operators (CSL24U / CSL24UL / CSL24V / CSL24VDC, CSW24U / CSW24UL / CSW24V / CSW24VDC). Motor only, bolts to the existing gearbox. If the tag on your motor reads 3K-244018WL or Chamberlain 20-24050B-S1, this is the part.
Match it by the tag. The label on the motor can carries three numbers: the motor maker's model 3K-244018WL, Chamberlain's 20-24050B-S1, and UL file E100847, plus DC VOLTS: 24. LiftMaster sells that motor under service number K76-36398. The S/N line (for example 0513-…) is the date code and serial of your individual motor — you do not need it to order.
Specifications
| LiftMaster part number | K76-36398 (UPC 012381108817) |
|---|---|
| Motor tag numbers | Model 3K-244018WL · Chamberlain 20-24050B-S1 · UL file E100847 |
| Power | 1/2 HP |
| Voltage | 24 VDC |
| Type | Permanent-magnet DC gearmotor drive, direct / bolt-on mount |
| Included | Motor only — no gearbox, brake, encoder or hardware |
| Fits | LiftMaster CSL24U, CSL24UL, CSL24V, CSL24VDC slide and CSW24U, CSW24UL, CSW24V, CSW24VDC swing gate operators |
| Condition | Genuine LiftMaster, new |
Is the motor the problem?
A 24 V operator that hums, clicks or does nothing is more often the batteries, the board or the encoder than the motor. Work through this before you order an $800 part:
| Symptom | Check first |
|---|---|
| Gate does nothing, board is powered | Battery voltage under load (two 12 V batteries, NP7-12), then the motor fuse and connector |
| Motor runs but the gate overruns or loses its limits | Encoder, not the motor — K1A6408 APE assembly |
| Motor stalls under load, runs free with the arm / chain off | Gate binding or a failed gearbox bearing before the motor |
| Motor hot, burnt smell, or no rotation with 24 V applied at its leads | The motor — this part |
| Board shows a motor or over-current fault | Wiring and the board's motor relay, then the motor |
Common questions
Does it fit the RSL12 or RSW12?
No. Those are 12 V operators with a different motor. This is the 24 V CSL24 / CSW24 motor.
Do I need to re-learn limits?
Yes. Re-run the limit learn after fitting the motor; the encoder count starts again.
Is the gearbox included?
No — motor only. Your existing gearbox stays.
Related
CSL24U parts · CSW24U parts · K1A6408 encoder · NP7-12 batteries
Send a photo of the motor tag to parts@gatehousesupplies.com or call 866-965-5599 and we will confirm the match.
