Liftmaster SL3000U SL3000UL SL3000501U Parts
LiftMaster SL3000U, SL3000UL & SL3000501U Replacement Parts
Genuine LiftMaster replacement parts for the SL3000U and SL3000UL commercial slide gate operators, sold under configuration codes such as SL3000501U — the AC-powered, V-belt driven pad-mount slider with a gear reducer and brake. Use the exploded diagram above to find the key number for the part you need, then click any part number in the tables below.
Check the horsepower before ordering the drive belt. Ref 3 is the 1/2 HP belt (K16-4L230) and Ref 4 is the 1 HP belt (K16-4L360). The horsepower is on the motor data plate.
Looking for the Elite-badged SL 3000? LiftMaster acquired Elite and kept the design under new numbers. Elite-branded parts are on the Elite SL 3000 parts page.
Shares its AC drive train with the CSW200U. The motor drive board, logic board, transformer and wire harnesses are common to both.
Common SL3000U Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| Motor runs but the gate does not move | V-belt slipping or glazed | K16-4L230 / K16-4L360 belt, K17-50095 and K17-50098 pulleys |
| Gate overruns or stops short | Limit switch, chain or sprockets | K23-50099 limit switch, K19-35056 limit chain, K76-37306 limit kit |
| Motor hums but will not start | Motor capacitor | K29C-65AU2415 capacitor |
| Gate coasts or will not hold position | Brake worn | K77-37710 brake kit, K32-37349 gear reducer and brake |
| Operator dead, no board lights | Transformer or logic board | K21-14182 transformer, K1D6761-1CC logic board |
| Erratic travel or missed counts | Hall effect board or RPM cup | K2A0878 hall effect board, K13-32087 RPM cup |
| Gate will not reset after an obstruction | Reset switch and its ID resistor | K94-37468 reset switch kit with ID |
| No response to remotes, wired controls work | Antenna | K77-37638 antenna and coax cable |
Gate Operator Repair & Service Parts
| Ref | Part # | Description |
|---|---|---|
| 1 | K77-37708 | Cover, SL3000AC |
| 2 | K17-50095 | Gear Pulley, 2-1/2" OD, 5/8" Bore, Q021 |
| 3 | K16-4L230 | Drive Belt — 1/2 HP |
| 4 | K16-4L360 | Drive Belt — 1 HP |
| 5 | K17-50098 | Motor Pulley, 2-1/2" OD, 1/2" Bore, Q025 |
| 6 & 7 | K20-1050B-1RSX | Motor, 1/2 HP, AC |
| 8 | K73-37199 | Chassis, SL3000 |
| 9 | K77-37710 | Brake Kit |
| 10 | K1D8387-1CC | Expansion Board, UL325 |
| 11 | K1D8402-1CC | Motor Drive Board, 1PH |
| 12 | K21-14182 | Transformer, 120/240V, 24VAC, 20VA |
| 13 | K29C-65AU2415 | Motor Capacitor, Q027 |
| 14 | K32-37349 | Gear Reducer and Brake |
| 15 | K94-37461 | Alarm and Harness |
| 16 | K13-34729 | E-Box Cover |
| 17 | K77-37638 | Antenna and Coax Cable |
| 18 | K75-50090 | Idler Pulley, Q013 |
| 19 | K15-35B17LGF | Limit Switch Sprocket, Q016 |
| 20 | K15-41B25LGH | Drive Sprocket |
| 21 | K19-35056 | Limit Switch Chain |
| 22 | K15-35B13AXR | Limit Switch Sprocket |
| 23 | K23-50099 | Limit Switch |
| 24 | K13-32087 | RPM Cup |
Parts Not Shown in Diagram
| Ref | Part # | Description |
|---|---|---|
| — | K2A0878 | Hall Effect Board |
| — | K19-40ML | Master Link, #40 |
| — | K07-50637 | Chain Bolt, Q003 |
| — | 77-36764 | Crank Bracket Kit |
| — | K77-37683 | Main Board Standoffs, Qty 10 |
| — | K77-37693 | Wire Harnesses, AC |
| — | K94-34778 | Board to Board Wire Harness, 24V |
| — | K94-37468 | Reset Switch Kit, with ID |
Service Kits
| Ref | Part # | Description |
|---|---|---|
| K1 | K76-37306 | Limit Switch Kit |
| K2 | K75-37300-1 | E-Box |
| K3 | K77-37709 | On/Off Switch and Receptacle Box |
| K4 | K1D6761-1CC | Logic Board, AC, with Mounting Bracket |